Статті в журналах: "Light wavelength conversion"

1

Wu, Yuning, Zhiwei Shi, Huan Jiang, and Yaohua Deng. "Multi-Wavelength Spot-Array Beams Based on Tunable Dammann Grating Metasurface." Photonics 10, no. 2 (January 30, 2023): 141. http://dx.doi.org/10.3390/photonics10020141.

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The structured light projection (SLP) method occupies a crucial position in three-dimensional (3D) imaging technology. Different working wavelengths of structured light can be employed depending on the situation. However, there are few structured lights that can be modulated based on wavelength at present. Therefore, we have comprehensively investigated and designed a Dammann grating (DG) based on metasurface, which can be controlled through multi-beam interference (MBI) to achieve a change of the working wavelength. In this work, we can convert the straight waveguide to the helical waveguide by fine-tuning the related parameters of the incident lights and generate 5 × 5 diffraction spot arrays in the wavelength range of 480–510 nm and 950–1020 nm, respectively. Furthermore, the metasurfaces exhibit good performance. For example, their spread angles can be up to 44° × 44° and they can reach a conversion efficiency of over ≥50% while maintaining a contrast ratio of roughly 40%. Compared with traditional structured light, it can be used in different working wavelengths and has a broader application range in 3D sensing systems.

2

Li, Yang, Zhijin Huang, Zhan Sui, Huajiang Chen, Xinyue Zhang, Weian Huang, Heyuan Guan, et al. "Optical anapole mode in nanostructured lithium niobate for enhancing second harmonic generation." Nanophotonics 9, no. 11 (June 29, 2020): 3575–85. http://dx.doi.org/10.1515/nanoph-2020-0222.

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AbstractSecond harmonic generation (SHG) with a material of large transparency is an attractive way of generating coherent light sources at exotic wavelength range such as VUV, UV and visible light. It is of critical importance to improve nonlinear conversion efficiency in order to find practical applications in quantum light source and high resolution nonlinear microscopy, etc. Here an enhanced SHG with conversion efficiency up to 10−2% at SH wavelength of 282.7 nm under 11 GW/cm2 pump intensity via the excitation of anapole in lithium niobite (LiNbO3, or LN) nanodisk through the dominating d33 nonlinear coefficient is investigated. The anapole has advantages of strongly suppressing far-field scattering and well-confined internal field which helps to boost the nonlinear conversion. Anapoles in LN nanodisk is facilitated by high index contrast between LN and substrate with properties of near-zero-index via hyperbolic metamaterial structure design. By tailoring the multi-layers structure of hyperbolic metamaterials, the anapole excitation wavelength can be tuned at different wavelengths. It indicates that an enhanced SHG can be achieved at a wide range of pump light wavelengths via different design of the epsilon-near-zero (ENZ) hyperbolic metamaterials substrates. The proposed nanostructure in this work might hold significances for the enhanced light–matter interactions at the nanoscale such as integrated optics.

3

Hemminga, D. J., O. O. Versolato та J. Sheil. "Simulations of plasmas driven by laser wavelengths in the 1:0642—10:6 μm range for their characterization as future extreme ultraviolet light sources". Physics of Plasmas 30, № 3 (березень 2023): 033301. http://dx.doi.org/10.1063/5.0125936.

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We characterize the properties of extreme ultraviolet (EUV) light source plasmas driven by laser wavelengths in the [Formula: see text] range and laser intensities of [Formula: see text] W cm−2 for [Formula: see text]. Detailed numerical simulations of laser-irradiated spherical tin microdroplet targets reveal a strong laser-wavelength dependence on laser absorptivity and the conversion efficiency of generating in-band EUV radiation. For [Formula: see text] irradiation, the increase in in-band radiation with increasing laser intensity is offset by only a minor reduction in conversion efficiency. Radiative losses are found to dominate the power balance for all laser wavelengths and intensities, and a clear shift from kinetic to in-band radiative losses with increasing laser wavelength is identified. Yet, with increasing laser intensity, such a shift is absent. We find that the existence of a maximum conversion efficiency, near [Formula: see text], originates from the interplay between the optical depths of the laser light and the in-band EUV photons for this specific droplet-target geometry.

4

Zhang, Yungang, Yongda Wang, Yunjie Liu, Xinyu Ai, Zhiguo Zhang, and Jimeng Li. "Measurement of CS2 Absorption Cross-Sections in the 188–215 nm Region at Room Temperature and Atmospheric Pressure." Applied Spectroscopy 75, no. 1 (October 6, 2020): 15–21. http://dx.doi.org/10.1177/0003702820955244.

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Carbon disulfide, an important sulfur-containing species, has strong absorption lines in the wavelength range of 188 nm to 215 nm. It is difficult to accurately measure the absorption cross sections of carbon disulfide because carbon disulfide will be easily converted into carbon sulfide when it is exposed to ultraviolet light. In this study, the absorption cross sections of carbon disulfide were measured by reducing carbon disulfide conversion. The factors affecting carbon disulfide conversion, including gas flow rate, ultraviolet light intensity, and duration of illumination, were studied to reduce the conversion of carbon disulfide by controlling experimental conditions in the experiment. Finally, the absorption cross sections of carbon disulfide at room temperature and atmospheric pressure were calculated using the absorption spectrum and the carbon disulfide concentration in the absence of carbon disulfide conversion. The wavelengths of 16 absorption peaks on the carbon disulfide absorption cross sections of the vibration change were marked. Carbon disulfide has the maximum absorption cross section of 4.5 × 10–16 cm2/molecule at a wavelength of 198.10 nm.

5

Arimi, Arsou, Ralf Dillert, Gerald Dräger, and Detlef W. Bahnemann. "Light-Induced Reactions of Chlorpromazine in the Presence of a Heterogeneous Photocatalyst: Formation of a Long-Lasting Sulfoxide." Catalysts 9, no. 7 (July 22, 2019): 627. http://dx.doi.org/10.3390/catal9070627.

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A commercial carbon-modified titanium dioxide, KRONOClean 7000, was applied as a UV(A) and visible-light active photocatalyst to investigate the conversion of the antipsychotic pharmaceutical chlorpromazine in aqueous phase employing two monochromatic light sources emitting at wavelengths of 365 and 455 nm. Photocatalytic and photolytic conversion of chlorpromazine under both anaerobic and aerobic conditions was analyzed using a HPLC-MS technique. Depending on the irradiation wavelength and presence of oxygen, varying conversion rates and intermediates revealing different reaction pathways were observed. Upon visible light irradiation under aerobic conditions, chlorpromazine was only converted in the presence of the photocatalyst. No photocatalytic conversion of this compound under anaerobic conditions upon visible light irradiation was observed. Upon UV(A) irradiation, chlorpromazine was successfully converted into its metabolites in both presence and absence of the photocatalyst. Most importantly, chlorpromazine sulfoxide, a very persistent metabolite of chlorpromazine, was produced throughout the photolytic and photocatalytic conversions of chlorpromazine under aerobic conditions. Chlorpromazine sulfoxide was found to be highly stable under visible light irradiation even in the presence of the photocatalyst. Heterogeneous photocatalysis under UV(A) irradiation resulted in a slow decrease of the sulfoxide concentration, however, the required irradiation time for its complete removal was found to be much longer compared to the removal of chlorpromazine at the same initial concentration.

6

Wang, Li Li, and Xiang Yan Qiu. "Theoretical Analysis of Wavelength Conversion in Fiber Bragg Grating External Cavity Lasers." Applied Mechanics and Materials 236-237 (November 2012): 981–83. http://dx.doi.org/10.4028/www.scientific.net/amm.236-237.981.

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A new theoretical model for wavelength conversion based on XGM in fiber grating external cavity lasers is presented. The expression of mutual coupling parameter βm which indicates the efficiency of the wavelength conversion.was introduced in the model and and confirmed by numerical simulation. The theoretical analysis showed that the mutual coupling parameter βm is decided by intensity and frequency interval of CW light and the IM light, and the simulation results showed that the larger βm was, the better wavelength conversion was.

7

Liu, Yi, Zhiguo Gui, and Jialei Liu. "Research Progress of Light Wavelength Conversion Materials and Their Applications in Functional Agricultural Films." Polymers 14, no. 5 (February 22, 2022): 851. http://dx.doi.org/10.3390/polym14050851.

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As new fluorescent materials, light wavelength conversion materials (light conversion agents) have attracted increasing attention from scientific researchers and agricultural materials companies due to their potential advantages in efficiently utilizing solar energy and increasing crop yield. According to the material properties, the light conversion agents can be divided into fluorescent dyes, organic rare-earth complexes, and inorganic rare-earth complexes. The current researches indicates that the fluorescent dyes have relatively high production costs, poor light stability, difficult degradation processes, and easily cause pollution to the ecological environment. The organic rare-earth complexes have short luminescence times, high production costs, and suffer from rapid decreases in luminescence intensity. Compared with fluorescent dyes and organic rare-earth complexes, although rare-earth inorganic complexes have high luminous efficiency, stable chemical properties, and better spectral matching performance, the existing inorganic light conversion agents have relatively poor dispersibility in agricultural films. According to the research on light conversion agents at home and abroad in recent years, this paper first introduces the three common light conversion agents, namely fluorescent dyes, organic rare-earth complexes, and inorganic rare-earth complexes, as well as their uses in agricultural films and their mechanisms of light conversion. At the same time, the preparation methods, advantages, disadvantages, and existing problems of various light conversion agents are classified and explained. Finally, we predict the development trends for light conversion agents in the future by considering six aspects, namely efficiency, cost, compatibility with greenhouse films, light matching, and light transmittance, in order to provide a reference for the preparation of stable and efficient light conversion agent materials.

8

KOUTA, Hikaru, and Yasuhiko KUWANO. "Light Scattering in a Wavelength Conversion BBO Single Crystal." Review of Laser Engineering 26, no. 3 (1998): 261–64. http://dx.doi.org/10.2184/lsj.26.261.

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9

Arahira, Shin, and Hitoshi Murai. "Wavelength conversion of incoherent light by sum-frequency generation." Optics Express 22, no. 11 (May 21, 2014): 12944. http://dx.doi.org/10.1364/oe.22.012944.

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10

Taghizad Fanid, A., and A. Rostami. "A proposal for wide range wavelength switching process using optical force." Physica Scripta 96, no. 12 (December 1, 2021): 125537. http://dx.doi.org/10.1088/1402-4896/ac3fd3.

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Abstract Optomechanical wavelength up-conversion based on optical force and core–shell scattering effects are used to control light coupling between two waveguides. This system consists of two parallel optical waveguides with 20 μm lengths suspended on a silica substrate embedded with Ag/Si/SiO2 core–shell nanoparticles. By mid-IR plane wave illumination with different intensities and different wavelengths on nanoparticles, scattering would increase and result in an improvement in attractive gradient optical force exerted on waveguides. Via bending waveguides toward each other, visible light propagating in the first waveguide would couple to another. PDMS as a polymer is used to reduce the required power for bending waveguides. Results reveal that when waveguides’ gap equilibrium is 400 nm and wavelengths of control and probe lights are 4.5 μm and 0.45 μm respectively, about 10.75 mW μm−2 power is needed to bend waveguides for total coupling of light between waveguides. The efficiency of the coupled waveguides system is %43.

11

Tseng, Kuo-Bin. "Efficient multicast routing in wavelength-division-multiplexing networks with light splitting and wavelength conversion." Optical Engineering 44, no. 4 (April 1, 2005): 045003. http://dx.doi.org/10.1117/1.1886846.

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12

Lin, Jui-Teng, Da-Chuan Cheng, Kuo-Ti Chen, and Hsia-Wei Liu. "Dual-Wavelength (UV and Blue) Controlled Photopolymerization Confinement for 3D-Printing: Modeling and Analysis of Measurements." Polymers 11, no. 11 (November 6, 2019): 1819. http://dx.doi.org/10.3390/polym11111819.

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The kinetics and modeling of dual-wavelength (UV and blue) controlled photopolymerization confinement (PC) are presented and measured data are analyzed by analytic formulas and numerical data. The UV-light initiated inhibition effect is strongly monomer-dependent due to different C=C bond rate constants and conversion efficacies. Without the UV-light, for a given blue-light intensity, higher initiator concentration (C10) and rate constant (k’) lead to higher conversion, as also predicted by analytic formulas, in which the total conversion rate (RT) is an increasing function of C1 and k’R, which is proportional to k’[gB1C1]0.5. However, the coupling factor B1 plays a different role that higher B1 leads to higher conversion only in the transient regime; whereas higher B1 leads to lower steady-state conversion. For a fixed initiator concentration C10, higher inhibitor concentration (C20) leads to lower conversion due to a stronger inhibition effect. However, same conversion reduction was found for the same H-factor defined by H0 = [b1C10 − b2C20]. Conversion of blue-only are much higher than that of UV-only and UV-blue combined, in which high C20 results a strong reduction of blue-only-conversion, such that the UV-light serves as the turn-off (trigger) mechanism for the purpose of spatial confirmation within the overlap area of UV and blue light. For example, UV-light controlled methacrylate conversion of a glycidyl dimethacrylate resin is formulated with a tertiary amine co-initiator, and butyl nitrite. The system is subject to a continuous exposure of a blue light, but an on-off exposure of a UV-light. Finally, we developed a theoretical new finding for the criterion of a good material/candidate governed by a double ratio of light-intensity and concentration, [I20C20]/[I10C10].

13

Yuan, Yu Chen, Chen Wu Wu, and Guang Nan Chen. "Responses of Thin Film Photovoltaic Cell to Irradiation under Double Laser Beams of Different Wavelength." Materials Science Forum 743-744 (January 2013): 937–42. http://dx.doi.org/10.4028/www.scientific.net/msf.743-744.937.

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During the process of Laser beam long-range energy transmission based on the photovoltaic principle, the temperature elevation of the photovoltaic cell under Laser irradiation would greatly affect its photoelectric conversion efficiency. In this work, the heat generation mechanism of thin-film photovoltaic cell under Laser irradiation was analyzed based on the energy conversion relationship between light, electricity and heat. The output voltage characteristic of a thin film GaInP/GaAs/Ge triple-junction photovoltaic cell under irradiation of dual-wavelength Laser beam was investigated, and the results show the dependence of the conversion efficiency on the temperature and the valve effect, which was caused by the long wavelength Laser and would sharply reduce the photovoltaic conversion efficiency of short wavelength Laser. The temperature field of the multi-layer structure subjected to Laser irradiation was analyzed by finite element method, and the results indicate that the temperature elevation pattern depends on the spatial distribution of the light absorption and can be adjusted via optimizing the photovoltaic cell structure.

14

Skala, Vaclav. "Multispectral Image Generation from RGB Based on WSL Color Representation: Wavelength, Saturation, and Lightness." Computers 12, no. 9 (September 13, 2023): 182. http://dx.doi.org/10.3390/computers12090182.

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Image processing techniques are based nearly exclusively on RGB (red–green–blue) representation, which is significantly influenced by technological issues. The RGB triplet represents a mixture of the wavelength, saturation, and lightness values of light. It leads to unexpected chromaticity artifacts in processing. Therefore, processing based on the wavelength, saturation, and lightness should be more resistant to the introduction of color artifacts. The proposed process of converting RGB values to corresponding wavelengths is not straightforward. In this contribution, a novel simple and accurate method for extracting the wavelength, saturation, and lightness of a color represented by an RGB triplet is described. The conversion relies on the known RGB values of the rainbow spectrum and accommodates variations in color saturation.

15

Trapani, Danilo, Roberto Macaluso, Isodiana Crupi, and Mauro Mosca. "Color Conversion Light-Emitting Diodes Based on Carbon Dots: A Review." Materials 15, no. 15 (August 8, 2022): 5450. http://dx.doi.org/10.3390/ma15155450.

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This paper reviews the state-of-the-art technologies, characterizations, materials (precursors and encapsulants), and challenges concerning multicolor and white light-emitting diodes (LEDs) based on carbon dots (CDs) as color converters. Herein, CDs are exploited to achieve emission in LEDs at wavelengths longer than the pump wavelength. White LEDs are typically obtained by pumping broad band visible-emitting CDs by an UV LED, or yellow–green-emitting CDs by a blue LED. The most important methods used to produce CDs, top-down and bottom-up, are described in detail, together with the process that allows one to embed the synthetized CDs on the surface of the pumping LEDs. Experimental results show that CDs are very promising ecofriendly candidates with the potential to replace phosphors in traditional color conversion LEDs. The future for these devices is bright, but several goals must still be achieved to reach full maturity.

16

Lin, Yonghong, Wenjun Huang, Mengyuan Zhanghu, and Zhaojun Liu. "8.2: Invited Paper: The Full‐color Micro‐LED Display with Quantum Dots Inkjet Printing." SID Symposium Digest of Technical Papers 54, S1 (April 2023): 81–83. http://dx.doi.org/10.1002/sdtp.16227.

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A color conversion film, including red and green quantum dots, is fabricated using inkjet printing. To ensure the efficiency of the color conversion, a color filter is utilized to remove extra blue light. By selecting the appropriate central wavelength for the filter, the color conversion film can convert blue light to red and green light without extra blue light. The color conversion film is stimulated by blue micro‐LED, and the resulting color gamut can achieve 84.5% BT.2020. These results demonstrate that combining a quantum dots film with a color filter can result in full‐color micro‐LED displays.

17

Ni, Ya Ru, Lian Chao Wu, Chun Hua Lu, and Zhong Zi Xu. "Synthesis and Characterization of Rare Earth (Sm,Y) Light Conversion Film." Materials Science Forum 610-613 (January 2009): 257–61. http://dx.doi.org/10.4028/www.scientific.net/msf.610-613.257.

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In this article, Sm(Sal)xPhen, SmyY1-y(Sal)3Phen were synthesized and its films were prepared. They were characterized by infrared spectra (IR), ultra-violet visible spectrometer (UV), X-ray diffraction (XRD) and fluorescence spectroscopy. Sm/Y complexes and its mixture doped with the polyvinyl alcohol (PVA) showed photoluminescence at the wavelength of 646 nm. There was an excellent compatibility among Sm/Y complexes, the polyvinyl alcohol (PVA) and dimethyl sulphoxide (DMSO), which were used to prepare the resin film. The results indicated that Sm/Y rare earth light conversion films were better light conversion films with good compatibility in resins, and with emission wavelength suitable for plants’ photosynthesis.

18

Михеев, К. Г., Р. Г. Зонов, Д. Л. Булатов, А. Е. Фатеев та Г. М. Михеев. "Лазерно-индуцированный графен на полиимидной пленке: наблюдение эффекта увлечения". Письма в журнал технической физики 46, № 9 (2020): 51. http://dx.doi.org/10.21883/pjtf.2020.09.49375.18152.

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Porous graphene film structures were produced by irradiation of polyimide film with focused continuous wave CO2 laser. Generation of nanosecond pulses of photocurrent was observed in the obtained structures upon excitation by nanosecond laser pulses in a wide range of wavelengths. It is shown that the photocurrent linearly increases with pulsed laser power and its dependence on the angle of light incidence on the film structure is symmetric about the origin. Wavelength dependence of light-to-photocurrent conversion coefficient was measured. The obtained results are explained by photon-drag effect photocurrent generation.

19

Gong, Jia-Min, and Zhan-Qiang Hui. "Experimental demonstration of all optical 100 Gbit/s wavelength conversion with 1-to-2 wavelength multicasting based on cross-phase modulation in dispersion flattened highly nonlinear photonic crystal fiber." Journal of Nonlinear Optical Physics & Materials 23, no. 03 (September 2014): 1450038. http://dx.doi.org/10.1142/s0218863514500386.

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This paper proposed and experimentally demonstrated the effective design of a single-to-dual channel 100 Gbit/s wavelength converter with a simple configuration consisting of a single dispersion flattened highly nonlinear photonic crystal fiber (DS-HNL-PCF) and two optical bandpass filters (OBPFs). The polarity-preserved, ultrafast wavelength conversion with single-to-dual channel multicasting is achieved by simultaneously filtering the red- and blue-chirped spectral component of a probe light. Moreover, the wavelength tunability and dynamic characteristics of designed wavelength converter are investigated. The results show that the designed ultrafast wavelength converter has a wide wavelength conversion range of 29 nm, and high tolerance to input power fluctuations. It is very attractive for engineering application in modern microwave and ultrafast photonic networks.

20

Inoue, K., and N. Takato. "Wavelength conversion for FM light using light injection induced frequency shift in DFB-LD." Electronics Letters 25, no. 20 (1989): 1360. http://dx.doi.org/10.1049/el:19890909.

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21

He, Yanjin, Yongtao Wang, Yanjun Guo, and Lei Ma. "Fine adjustment of emission wavelength, light-conversion quality, photostability of blue-violet light conversion agents based on FRET effect." Dyes and Pigments 217 (September 2023): 111429. http://dx.doi.org/10.1016/j.dyepig.2023.111429.

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22

Inoue, K., and K. Oda. "Noise suppression in wavelength conversion using a light-injected laser diode." IEEE Photonics Technology Letters 7, no. 5 (May 1995): 500–501. http://dx.doi.org/10.1109/68.384523.

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23

Tsuji, Kenichiro, Dwi Cahyo Kuncoro, Takuya Watanabe, Noriaki Onodera, and Masatoshi Saruwatari. "Effect of assist light on XGM-based wavelength-conversion using SOAs." Electronics and Communications in Japan (Part II: Electronics) 88, no. 5 (2005): 10–20. http://dx.doi.org/10.1002/ecjb.20131.

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24

Sato, R., T. Ito, K. Magari, A. Okada, M. Oguma, Y. Suzaki, A. Himeno, and N. Ishihara. "Demonstration of packet-by-packet wavelength conversion from FP-LD light to ITU-T grid wavelengths." IEEE Photonics Technology Letters 13, no. 6 (June 2001): 612–14. http://dx.doi.org/10.1109/68.924040.

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25

Tian, Ying, Lichang Han, Li Yan, Jiayun Wang, Binzhen Zhang, and Zan Jiao. "Optically-Controlled Terahertz Multifunctional Polarization Conversion Metasurface with Reflection and Transmission Modes." Micromachines 13, no. 9 (August 25, 2022): 1387. http://dx.doi.org/10.3390/mi13091387.

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In the terahertz band, how integrating multiple functions into a device with a tiny unit structure is a challenge. In this paper, an optically-controlled multifunctional linear polarization conversion metasurface working in the terahertz band is proposed. The reflection and transmission polarization conversion functions can be realized by irradiating the metasurface with pump light with different wavelengths. The metasurface is designed with a multilayer structure, and a photosensitive semiconductor alone is used to control multiple functions, which makes the manipulation of multifunctional devices easy. When the photosensitive semiconductor germanium (Ge) and silicon (Si) are in different states, the metasurface can realize broadband reflection and transmission polarization conversion functions, the corresponding relative bandwidth are 102.4% and 98.9%, respectively, and the work efficiency can be regulated by pump light with different intensity and wavelength. In addition, the working principle of the metasurface is analyzed by eigenmode theory and surface current distributions. The stability of the metasurface to structural parameters and incident angles are discussed.

26

Lizyakina, O. S., L. B. Vaganova, and D. F. Grishin. "Features of Methyl Methacrylate Polymerization Mediated by Methylene Blue and Ethyl 2-Bromoisobutyrate under Photoirradiation Conditions." Высокомолекулярные соединения Б 65, no. 3 (May 1, 2023): 189–203. http://dx.doi.org/10.31857/s2308113923700481.

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Using methyl methacrylate polymerization as an example, the features of polymer synthesis in the presence of the catalytic system [methylene blue + ethyl 2-bromoisobutyrate] at room temperature under visible light irradiation are investigated. The effect of polymerization conditions, including the light irradiation wavelength and various structure activators, on the monomer conversion and molecular weight characteristics of polymers is estimated. It is shown that polymerization can proceed in the controlled mode under mild temperature conditions according to the atom transfer mechanism (Metal Free Atom Transfer Radical Polymerization) to high conversions at low photocatalyst concentrations.

27

Kim, Chang Woo, Woo Jin Shin, Mi Jin Choi, Jae Ho Lee, Sang Hwan Nam, Yung Doug Suh, Yong Soo Kang, and Young Soo Kang. "Wavelength conversion effect-assisted dye-sensitized solar cells for enhanced solar light harvesting." Journal of Materials Chemistry A 4, no. 30 (2016): 11908–15. http://dx.doi.org/10.1039/c6ta04526j.

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28

Matsuo, Shun, and Hiroyuki Uenohara. "Investigation of pump light generation methods and precise all-optical FWM wavelength conversion for wavelength defragmentation." IEICE Communications Express 9, no. 8 (August 1, 2020): 383–88. http://dx.doi.org/10.1587/comex.2020xbl0065.

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29

Arp, Trevor B., Jed Kistner-Morris, Vivek Aji, Richard J. Cogdell, Rienk van Grondelle, and Nathaniel M. Gabor. "Quieting a noisy antenna reproduces photosynthetic light-harvesting spectra." Science 368, no. 6498 (June 25, 2020): 1490–95. http://dx.doi.org/10.1126/science.aba6630.

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Photosynthesis achieves near unity light-harvesting quantum efficiency yet it remains unknown whether there exists a fundamental organizing principle giving rise to robust light harvesting in the presence of dynamic light conditions and noisy physiological environments. Here, we present a noise-canceling network model that relates noisy physiological conditions, power conversion efficiency, and the resulting absorption spectra of photosynthetic organisms. Using light conditions in full solar exposure, light filtered by oxygenic phototrophs, and light filtered under seawater, we derived optimal absorption characteristics for efficient solar power conversion. We show how light-harvesting antennae can be tuned to maximize power conversion efficiency by minimizing excitation noise, thus providing a unified theoretical basis for the observed wavelength dependence of absorption in green plants, purple bacteria, and green sulfur bacteria.

30

Miwa, Kaito, Hiroki Ebihara, Xu Fang, and Wakana Kubo. "Photo-Thermoelectric Conversion of Plasmonic Nanohole Array." Applied Sciences 10, no. 8 (April 13, 2020): 2681. http://dx.doi.org/10.3390/app10082681.

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Plasmonic photo-thermoelectric conversion offers an alternative photodetection mechanism that is not restricted by semiconductor bandgaps. Here, we report a plasmonic photodetector consisting of an ultra-thin silver film with nanohole array, whose photodetection mechanism is based on thermoelectric conversion triggered by plasmonic local heating. The detector exhibits a maximum photocurrent at the wavelength of the surface plasmon polaritons, determined by the periodicity of the nanoholes. Hence, the response wavelength of the detector can be controlled via the morphological parameters of the nanohole pattern. The contribution of plasmonic local heating to thermoelectric conversion is verified experimentally and numerically, enabling discussion on the mechanisms governing light detection. These results provide a starting point for the development of other nanoscale photodetectors.

31

Wang, Ke, Qi-Dong Liu, Yu-Feng Song, Bin Zhang, Qing-Dong Zeng, Yuan-Yuan Zhang, and Zhen-Hong Wang. "TiN/Ti3C2 Heterojunction Microfiber-Enhanced Four-Wave Mixing-Based All-Optical Wavelength Converter." Photonics 10, no. 10 (September 22, 2023): 1066. http://dx.doi.org/10.3390/photonics10101066.

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As a novel nanomaterial, the TiN/Ti3C2 heterojunction has been demonstrated to possess exceptional optoelectronic properties, offering significant potential for applications in fields such as communication, optical sensors, and image processing. The rapid evolution of the internet demands higher communication capacity and information processing speed. In this context, all-optical wavelength conversion, a pivotal technique in all-optical signal processing, holds paramount importance in overcoming electronic bottlenecks, enhancing wavelength utilization, resolving wavelength competition, and mitigating network congestion. Utilizing the idle light generated through the four-wave mixing (FWM) process accurately mimics the bit patterns of signal channels. This process is inherently rapid and theoretically capable of surpassing electronic bottlenecks with ease. By placing an optical filter at the fiber output end to allow idle light passage while blocking pump and signal light, the output becomes a wavelength-converted replica of the original bitstream. It has been verified that TiN/Ti3C2 heterojunction-coated microfiber (THM) exhibits outstanding third-order nonlinear coefficients. Building upon this, we achieved a THM-enhanced FWM all-optical wavelength converter, resulting in a ~4.48 dB improvement in conversion efficiency. Compared to conventional high-nonlinear fibers, this compact device significantly reduces fiber length and can be easily integrated into current high-speed optical communication networks. It demonstrates broad prospects in the realms of all-optical signal processing, robotic applications, ultra-high-speed communication, and beyond.

32

Kanbe, Kengo, Tsuyoshi Akiyama, Yu Kumagawa, Shuya Hirata, Takatoshi Tsujiai, and Takeo Oku. "Electrochemical fabrication of hierarchical thin films consisting of different polythiophenes and change in photoelectric conversion properties with film thickness." Japanese Journal of Applied Physics 61, no. 6 (May 24, 2022): 061008. http://dx.doi.org/10.35848/1347-4065/ac6408.

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Abstract Hierarchical polybithiophene/poly(3,4-ethylenedioxythiophene) films with polybithiophene layers of various thicknesses were prepared on an indium tin oxide glass transparent electrode by sequential electrochemical polymerization. In the presence of methyl viologen as a sacrificial electron acceptor, cathodic photocurrents were generated under monochromatic light irradiation. The irradiation light wavelength dependence of the incident photon-to-electron conversion efficiency changed drastically with the thickness of the polybithiophene layer. The main reason for the change in the photoelectric conversion properties was light absorption by the polybithiophene layer.

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Kimovec, Rok, and Marko Topic. "Comparison of measured performance and theoretical limits of gaas laser power converters under monochromatic light." Facta universitatis - series: Electronics and Energetics 30, no. 1 (2017): 93–106. http://dx.doi.org/10.2298/fuee1701093k.

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Evaluation of GaAs laser power converters (LPC) is reported in light of theoretical maximum limits calculated with detailed balance method as proposed by Shockley and Queisser (SQ). Calculations were done for three different theoretical structures of LPCs homogeneously illuminated by monochromatic light. Effects of LPC thickness, central wavelength of a monochromatic light source and various irradiance levels are discussed. Reflection of incident light from the interface between air and GaAs is calculated and countermeasures in the form of single and double layer anti reflection coatings are theoretically studied. Measurements of single junction, single segment GaAs LPC illuminated by monochromatic light with central wavelength ?0 = 808 nm are presented and compared with the theoretical maximum values. The conversion efficiency ?meas = 54,4 % was measured for GaAs LPC illuminated with power density of monochromatic light pillum = 14,3 W/cm2 at the temperature of the LPC casing T = 302 K. For the same parameters conversion efficiency ?SQ = 76,6 % was calculated resulting in utilization ratio ?meas/?SQ=0,71. Measured Jsc and Voc achieve 88,5 % and 89,2 % of theoretically calculated SQ limit values.

34

Ji, Di, Zhitao Hu, Nan Ye, Fufei Pang, and Yingxiong Song. "Photo-Generation of Tunable Microwave Carriers at 2 µm Wavelengths Using Double Sideband with Carrier Suppression Modulation." Applied Sciences 12, no. 6 (March 20, 2022): 3172. http://dx.doi.org/10.3390/app12063172.

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At 2 µm wavelengths (149.9 THz), hollow-core photonics band gap fibers have higher light power damage thresholds, stable polarization states, and lower losses of 0.1 dB/km. Additionally, a thulium-doped fiber amplifier can provide a gain of >35 dB. Specifically, an indium-rich InGaAs photodetector shows a naturally higher photoresponsivity at 2 µm wavelengths than the C-band. Therefore, using tunable photo-generated microwave technology at 2 µm wavelengths could achieve higher photo-to-electric power conversion efficiencies for higher RF output power applications using the same method at the same frequency. Here, a double sideband with the carrier suppression modulation method was experimentally applied on 2 µm wavelengths to generate tunable and stable microwave carriers. Comparison experiments were also applied on the 1.55 µm (193.4 THz)/1.31 µm wavelengths (228.8 THz) based on the same indium-rich InGaAs photodetector. Through normalization on the wavelength-corresponded squared external quantum efficiency to visualize the photo-to-electric power conversion efficiency at different wavelengths under the same input optical signal power, the ratio between the results at 2 µm wavelengths and C/O-band is abstracted as 1.31/1.98, approaching theoretical estimations. This corresponds to a power conversion efficiency increasement of ~1.16 dB/~2.98 dB. To our knowledge, this is the first study on 2 micron wavelengths that proves the corresponding high efficiency power conversion property.

35

Choi, Uiho, Sung Tae Yoo, Minho Kim, Byeongchan So, Changheon Cheon, Mino Yang, Moonsang Lee, Kyu Chang Park, and Okhyun Nam. "Far-UVC emission of polarity-engineered AlGaN MQW using carbon nanotube-based cold cathode electron beam." Applied Physics Letters 122, no. 9 (February 27, 2023): 091104. http://dx.doi.org/10.1063/5.0122697.

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Far-ultraviolet-C (UVC) light is an efficient and safe germicide because the wavelength band eradicates viruses but is harmless to human cells. In this study, electron-beam-pumped AlGaN emitters have been introduced as an alternative to far-UVC light emitting diodes which are limited by certain drawbacks, such as low conductivity and light absorption of the p-layer and side emission due to polarization at short wavelengths. We demonstrate a highly efficient far-UVC AlGaN emitter using a carbon nanotube-based cold cathode electron beam (C-beam). To maximize light emission, materials were grown via novel in situ lateral polarity engineering epitaxy. The C-beam enables the large-area emission of up to 528 mm2, and the maximum power conversion efficiency is 0.5% at 232 nm.

36

Sato, Takenari, Takafumi Nakagawa, Hiroshi Okada, and Yutaka Matsuo. "Diporphyrin magnesium complex with long-wavelength light absorption for organic solar cells." Journal of Porphyrins and Phthalocyanines 19, no. 01-03 (January 2015): 451–58. http://dx.doi.org/10.1142/s1088424615500303.

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We synthesized a diporphyrin compound [4,7-bis[5-[arylethynyl]-10,20-bis{(triisopropylsilyl)ethynyl}porphyrin-15-yl]]-2,1,3-benzothiadiazole dimagnesium(II)], in which two porphyrin units were linked using a benzodiathiazole unit as an electron-withdrawing moiety. These diporphyrins have low-lying HOMO and LUMO levels with long-wavelength light absorption property. Power conversion efficiency of the organic solar cell using this diporphyrin and mix-PCBM (a 85:15 mixture of [6,6]-phenyl- C 61-butyric acid methyl ester ( PC 61 BM ) and [6,6]-phenyl- C 71-butyric acid methyl ester ( PC 71 BM ) was 2.75% with short-circuit current density of 8.79 mA/cm2, open-circuit voltage of 0.80 V, and fill factor of 0.39. Photocurrent conversion in the near infrared region was demonstrated by the incident photon-to-current efficiency spectrum.

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Liu, Wenlong, Xuebin Liu, Qiangqiang Yan, Simiao Qiang, Haifeng Pi, Bingliang Hu, and Lingxuan Zhang. "On-chip optical isolator based on unidirectional wavelength-mode conversion waveguide." Modern Physics Letters B 32, no. 22 (August 7, 2018): 1850258. http://dx.doi.org/10.1142/s0217984918502585.

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Breaking Lorentz reciprocity is one necessary condition of optical isolator design. Unidirectional wavelength-mode conversion will be realized in a time-dependent system through a short operating range. Based on plasma dispersion effect, generate space-asymmetric periodical time-space modulation on silicon waveguide, and non-reciprocal propagation is realized in the waveguide. The designed unidirectional wavelength-mode conversion waveguide demonstrated that in the forward direction, input 1.55 [Formula: see text]m fundamental mode light signal and then output 1.5492 [Formula: see text]m is of 1st-order mode, while in the backward direction, input 1.5492 [Formula: see text]m is of 1st-order mode light signal and then output 1.5484 [Formula: see text]m is of fundamental mode. Based on this non-reciprocal structure, mode conversion waveguide and two-ring resonance filters were designed then, to accomplish on-chip optical isolation. The scale of the designed isolator is 160 [Formula: see text]m × 60 [Formula: see text]m, and the isolation is 21 dB, revealing perfect application potential.

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DURFEE III, C. G., A. RUNDQUIST, S. BACKUS, Z. CHANG, C. HERNE, H. C. KAPTEYN, and M. M. MURNANE. "GUIDED-WAVE PHASE-MATCHING OF ULTRASHORT-PULSE LIGHT." Journal of Nonlinear Optical Physics & Materials 08, no. 02 (June 1999): 211–34. http://dx.doi.org/10.1142/s0218863599000151.

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We review the use of hollow waveguides for frequency conversion of ultrafast laser pulses the ultraviolet and extreme ultraviolet. Phase-matching of these processes is reached through a balance of gas and waveguide dispersion. By mixing 400 nm with 800 nm light, ultrashort (8 fs) pulses are generated near 270 nm with high efficiency > 20%. Tuning of the longer-wavelength component in the mixing process allows tuning of the output from 215–308 nm. In the XUV, this guided-wave phase-matching has allowed an increase of conversion efficiency of high-order harmonic generation of 100–1000x over that obtained with a gas jet, in an experimentally-convenient geometry.

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Yamazaki, E., G. Weichenberg, A. Takada, and T. Morioka. "Polarisation-insensitive parametric wavelength conversion without tunable filters for converted light extraction." Electronics Letters 42, no. 6 (2006): 365. http://dx.doi.org/10.1049/el:20064412.

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40

Gao, Lu, Kelvin H. Wagner, and Robert R. McLeod. "All-Optical Tb/S 3R Wavelength Conversion Using Dispersion-Managed Light Bullets." IEEE Journal of Selected Topics in Quantum Electronics 14, no. 3 (2008): 625–34. http://dx.doi.org/10.1109/jstqe.2008.921999.

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41

Inoue, K., and M. Yoshino. "Noise suppression effect in cascaded wavelength conversion using light-injected DFB-LDs." Electronics Letters 32, no. 23 (1996): 2165. http://dx.doi.org/10.1049/el:19961426.

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42

Cates, Ezra L., Stephanie L. Chinnapongse, Jae-Hyuk Kim, and Jae-Hong Kim. "Engineering Light: Advances in Wavelength Conversion Materials for Energy and Environmental Technologies." Environmental Science & Technology 46, no. 22 (November 7, 2012): 12316–28. http://dx.doi.org/10.1021/es303612p.

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43

Tham, Wai Qian, Subhash Chandra, Brian Norton, and Sarah McCormack. "Introducing luminescent solar waveguides for sustainable buildings for enhanced circadian rhythm regulation." Sustainable Buildings 6 (2023): 6. http://dx.doi.org/10.1051/sbuild/2023007.

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As the world strives towards a low-carbon future, nearly-zero energy buildings (NZEB) have been the goal to reduce carbon emissions. Artificial lighting is estimated to consume as high as 40% of the total energy consumption in a commercial building. By utilising daylighting, which is the practice of allowing natural light into a building, energy consumption by artificial lighting can be reduced. Luminescent solar concentrators (LSCs) can act as a collector and waveguide to transport outdoor light into the building through total internal reflection. Besides, LSCs absorb a part of the solar spectrum and shift them to different wavelengths through up-conversion or down-conversion. Thus, the output spectrum can be manipulated for the desired indoor applications. Circadian rhythm is the periodic variations in behaviour that follows a 24-hour cycle, which is mainly regulated by light response. A regulated circadian rhythm is important for a healthy life, whereas a disturbed circadian rhythm can lead to health issues such as insomnia and mood disorders. There has been a consensus that our circadian rhythm strongly responds to shorter wavelength light, corroborated in studies. Thus, manipulating the output light of LSCs to contain larger proportions of light with shorter wavelengths could enhance circadian regulation. LSC devices have the potential to transport sufficient daylight up to 5m deep into the building, achieving areas beyond the reach of windows. Thus, LSCs can serve as a tool for daylighting purposes, regulating circadian rhythm and providing sufficient light for comfortable indoor visibility.

44

Liu, Huanlin, Hongyue Dai, Fei Zhai, Yong Chen, and Chengying Wei. "Longest Path Reroute to Optimize the Optical Multicast Routing in Sparse Splitting WDM Networks." International Journal of Optics 2015 (2015): 1–6. http://dx.doi.org/10.1155/2015/489356.

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Limited by the sparse light-splitting capability in WDM networks, some nodes need to reroute the optical packet to different destination nodes with the high cost of routing for reducing packet loss possibility. In the paper, the longest path reroute optimization algorithm is put forward to jointly optimize the multicast routing cost and wavelength channel assignment cost for sparse splitting WDM networks. Based on heuristic algorithms, the longest path reroute routing algorithm calls multiple longest paths in existing multicast tree to reroute the path passing from the nodes which are violating the light-splitting constraint to the nodes which are not violating light-splitting constraint with few wavelength channels and low rerouting cost. And a wavelength cost control factor is designed to select the reroute path with the lowest cost by comparing the multicast rerouting path cost increment with the equivalent wavelength channel required cost increment. By adjusting wavelength cost control factor, we can usually get the optimized multicast routing according to the actual network available wavelength conversion cost. Simulation results show that the proposed algorithm can get the low-cost multicast tree and reduce the required number of wavelength channels.

45

Rogers, Ariel, Isabelle I. Niyonshuti, Jun Ou, Diksha Shrestha, Deborah Okyere, Jingyi Chen, and Yong Wang. "The Shape Modulation of Laser-Induced Nanowelded Microstructures Using Two Colors." Colloids and Interfaces 7, no. 4 (November 9, 2023): 67. http://dx.doi.org/10.3390/colloids7040067.

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The light-based nanowelding of metallic nanoparticles is of particular interest because it provides convenient and controlled means for the conversion of nanoparticles into microstructures and the fabrication of nanodevices. In this study, we investigated the wavelength dependence of laser-induced nanowelded shapes of silver nanoparticles (AgNPs). We observed that the nanowelded microstructures illuminated with only a 405 nm laser were more branched than those formed via illumination using both the 405 nm and 532 nm lasers. We quantified this observation by two compactness descriptors and examined the dependence of the power of the 532 nm laser. More importantly, to understand the experimental observations, we formulated and tested a hypothesis by calculating the wavelength-dependent electric field enhancement due to the surface plasmon resonance of the AgNPs and nanowelded microstructures when illuminated with lights at the two wavelengths. Based on the different patterns of hot spots for welding AgNPs from these calculations, numerical simulations successfully reproduced the different shapes of nanowelded microstructures, supporting our hypothesis. This work suggests the possibility of light-based control of the shapes of laser-induced nanowelded microstructures of metallic nanoparticles. This work is expected to facilitate the development of broader applications using the nanowelding of metallic nanoparticles.

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Mahesh, K. P. O., Che-Yu Chang, Wei-Li Hong, Tzu-Hsiang Wen, Pei-Hsuan Lo, Hao-Zhe Chiu, Ching-Ling Hsu, Sheng-Fu Horng, and Yu-Chiang Chao. "Lead-free cesium tin halide nanocrystals for light-emitting diodes and color down conversion." RSC Advances 10, no. 61 (2020): 37161–67. http://dx.doi.org/10.1039/d0ra06139e.

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47

Xiao, Si, Yi Tan Gao, Xiu Qin Tian, and Jun He. "Characteristics Research of Gallium Arsenide Solar Cells under Femtosecond Laser Illumination." Advanced Materials Research 941-944 (June 2014): 575–79. http://dx.doi.org/10.4028/www.scientific.net/amr.941-944.575.

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Femtosecond laser with ultrashort pulse (≤35fs) is used to investigate the damage threshold and light-to-electric conversion efficiency of gallium arsenide solar cells. Different from nanosecond or picosecond lasers, the damage threshold of the solar cell illuminated by femtosecond laser is slightly higher than that under the illumination of continuous-waves laser with the same wavelength. Because the thermal non-equilibrium effect becomes obvious, heat conduction phenomenon no longer obeys the law of Fourier, when the heating pulse time of femtosecond laser is equal to or shorter than the electron-phonon coupling time. The photovoltaic properties of gallium arsenide solar cells under femtosecond pulse laser illumination are measured. The device shows better short circuit current and the light-to-electric conversion efficiency under femtosecond pulse laser than that under continuous-waves laser of the same wavelength.

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Zhang, Hang, Liang Wang, Xueli Li, Xiaoming Li, and Hui Li. "Tunable Multiple Surface Plasmonic Bending Beams into Single One by Changing Incident Light Wavelength." Photonics 10, no. 7 (June 30, 2023): 758. http://dx.doi.org/10.3390/photonics10070758.

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Controllable surface plasmonic bending beams (SPBs) with propagating along bending curves have a wide range of applications in the fields of fiber sensors, optical trapping, and micro-nano manipulations. In terms of designing and optimizing controllable SPB generators, there is great significance in realizing conversion between multiple SPBs and single SPB without rebuilding metasurface structures. In this study, a SPB generator, composed of an X-shaped nanohole array, is proposed to realize conversion between multiple SPBs and a single one by changing the incident light wavelength. The Fabry–Pérot (F–P) resonance effect of SPPs in nanoholes and localized surface plasmonic (LSP) resonance of the nanohole are utilized to explain this conversion. It turns out that the relationship between the electric field intensities of SPBs and the polarization angle of incident light satisfies the sine distribution, which is consistent with dipole radiation theory. In addition, we also find that the electric field intensities of SPBs rely on the width, length, and angle of the X-shaped nanohole. These findings could help in designing and optimizing controllable and multi-functions SPBs converters.

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Hwang, Ji Yong, II Tae Kim, and Hyung Wook Choi. "Characteristics of Perovskite Solar Cells with ZnGa2O4:Mn Phosphor Mixed Polyvinylidene Fluoride Down-Conversion Layer." Journal of Nanoelectronics and Optoelectronics 16, no. 6 (June 1, 2021): 855–60. http://dx.doi.org/10.1166/jno.2021.3013.

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To reduce the manufacturing cost of perovskite solar cells, soda-lime glass and transparent conducting oxides such as indium tin oxide and fluorine-doped tin oxide are the most widely used substrates and lighttransmitting electrodes. However, the transmittance spectra of soda-lime glass, indium tin oxide, and fluorinedoped tin oxide show that all light near and below 330 nm is absorbed; thus, with the use of these substrates, light energy near and below 330 nm cannot reach the perovskite light-absorbing layer. It is expected that the overall solar cell can be improved if the wavelength can be adjusted to reach the perovskite solar cell absorbing layer through down-conversion of energy in the optical wavelength band. In this study, a polyvinylidene fluoride transparent film mixed with a ZnGa2O4:Mn phosphor was applied to the incident side of the perovskite solar cell with the intent to increase the light conversion efficiency without changing the internal bandgap energy and structure. By adding a phosphor layer to the external surface of PSC exposed to incident light, the efficiency of the cell was increased by the down-conversion of ultraviolet light (290 nm) to the visible region (509 nm) while maintaining the transmittance. To manufacture the perovskite solar cell, a TiO2-based mesoporous electron transport layer was spin-coated onto the substrate. The perovskite layer used in this experiment was CH3NH3PbI3 and was fabricated on a TiO2 layer. Spiro-OMeTAD solution was spin-coated as a hole-transport layer.

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Murakami, Hiroshi. "Femtosecond time-resolved fluorescence up-conversion spectrometer corrected for wavelength-dependent conversion efficiency using continuous white light." Review of Scientific Instruments 77, no. 11 (November 2006): 113105. http://dx.doi.org/10.1063/1.2370428.

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