Статті в журналах: "Nanophotonic method"

1

So, Sunae, and Junsuk Rho. "Designing nanophotonic structures using conditional deep convolutional generative adversarial networks." Nanophotonics 8, no. 7 (June 22, 2019): 1255–61. http://dx.doi.org/10.1515/nanoph-2019-0117.

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AbstractData-driven design approaches based on deep learning have been introduced in nanophotonics to reduce time-consuming iterative simulations, which have been a major challenge. Here, we report the first use of conditional deep convolutional generative adversarial networks to design nanophotonic antennae that are not constrained to predefined shapes. For given input reflection spectra, the network generates desirable designs in the form of images; this allows suggestions of new structures that cannot be represented by structural parameters. Simulation results obtained from the generated designs agree well with the input reflection spectrum. This method opens new avenues toward the development of nanophotonics by providing a fast and convenient approach to the design of complex nanophotonic structures that have desired optical properties.

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2

Gómez-Gómez, Maribel, Ángela Ruiz-Tórtola, Daniel González-Lucas, María-José Bañuls, and Jaime García-Rupérez. "New Method for Online Regeneration of Silicon-Based Nanophotonic Biosensors." Proceedings 4, no. 1 (November 14, 2018): 22. http://dx.doi.org/10.3390/ecsa-5-05741.

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The optimal development of biosensors is a costly and time-consuming task, since an enormous amount of experiments is required. Therefore, the possibility of reusing the biosensors is highly desirable. In this work, a protocol based on the use of formamide for the regeneration of nanophotonic biosensors used for oligonucleotides detection is presented. This protocol was carried out online using the microfluidic system used to drive the target samples to the nanophotonic biosensor, thus allowing the possibility of running several experiments in a row using the same biosensor.

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3

BALILI, RYAN B. "TRANSFER MATRIX METHOD IN NANOPHOTONICS." International Journal of Modern Physics: Conference Series 17 (January 2012): 159–68. http://dx.doi.org/10.1142/s2010194512008057.

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Being able to manipulate light and confine it to small length scales have a multitude of applications in modern technology. Predicting the behavior of nanophotonic devices and the realization of new ones will greatly benefit from insights offered by analytical calculations and numerical modeling. In this paper, we elucidate the fundamental electromagnetic responses of materials and introduce a versatile technique, called transfer matrix method, in modeling the behavior of nanoscale heterostructures. Its application in novel photonic devices such as semiconductor microcavities and surface plasmon resonance sensors will be demonstrated.

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4

Borodin, B. R., F. A. Benimetskiy, V. Yu Davydov, I. A. Eliseyev, S. I. Lepeshov, A. A. Bogdanov, and P. A. Alekseev. "Mechanical scanning probe lithography of nanophotonic devices based on multilayer TMDCs." Journal of Physics: Conference Series 2015, no. 1 (November 1, 2021): 012020. http://dx.doi.org/10.1088/1742-6596/2015/1/012020.

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Abstract In this work, we demonstrate the possibility of using mechanical Scanning probe lithography (m-SPL) for fabricating nanophotonic devices based on multilayered transition metal dichalcogenides (TMDCs). By m-SPM, we created a nanophotonic resonator from a 70-nm thick MoSe2 flake transferred on Si/Au substrate. The optical properties of the created structure were investigated by measuring microphotoluminescence. The resonator exhibits four resonance PL peaks shifted in the long-wavelength area from the flake PL peak. Thus, here we demonstrate that m-SPL is a high-precision lithography method suitable for creating nanophotonic devices based on multilayered TMDCs.

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5

Kumar, Ravi, S. J. Yoon, K. G. Lee, Prabir Pal, R. P. Pant, C. K. Suman, S. R. Dhakate, Raj Kumar, Devesh K. Avasthi, and Dilip K. Singh. "Purification method dependent fluorescence from nitrogen-vacancy (NV) centers of nano-diamonds." RSC Advances 6, no. 52 (2016): 47164–73. http://dx.doi.org/10.1039/c6ra01510g.

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Nanodiamonds purified through acid reflux and air oxidation methods shows difference in their water dispersibility, particle shape and fluorescence intensity deciding their selective preference for biophotonic and nanophotonic applications.

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6

Lee, Jaechul, Cédric Killian, Sebastien Le Beux, and Daniel Chillet. "Distance-aware Approximate Nanophotonic Interconnect." ACM Transactions on Design Automation of Electronic Systems 27, no. 2 (March 31, 2022): 1–30. http://dx.doi.org/10.1145/3484309.

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The energy consumption of manycore architectures is dominated by data movement, which calls for energy-efficient and high-bandwidth interconnects. To overcome the bandwidth limitation of electrical interconnects, integrated optics appear as a promising technology. However, it suffers from high power overhead related to low laser efficiency, which calls for the use of techniques and methods to improve its energy costs. Besides, approximate computing is emerging as an efficient method to reduce energy consumption and improve execution speed of embedded computing systems. It relies on allowing accuracy reduction on data at the cost of tolerable application output error. In this context, the work presented in this article exploits both features by defining approximate communications for error-tolerant applications. We propose a method to design realistic and scalable nanophotonic interconnect supporting approximate data transmission and power adaption according to the communication distance to improve the energy efficiency. For this purpose, the data can be sent by mixing low optical power signal and truncation for the Least Significant Bits (LSB) of the floating-point numbers, while the overall power is adapted according to the communication distance. We define two ranges of communications, short and long, which require only four power levels. This reduces area and power overhead to control the laser output power. A transmission model allows estimating the laser power according to the targeted BER and the number of truncated bits, while the optical network interface allows configuring, at runtime, the number of approximated and truncated bits and the laser output powers. We explore the energy efficiency provided by each communication scheme, and we investigate the error resilience of the benchmarks over several approximation and truncation schemes. The simulation results of ApproxBench applications show that, compared to an interconnect involving only robust communications, approximations in the optical transmission led to up to 53% laser power reduction with a limited degradation at the application level with less than 9% of output error. Finally, we show that our solution is scalable and leads to 10% reduction in the total energy consumption, 35× reduction in the laser driver size, and 10× reduction in the laser controller compared to state-of-the-art solution.

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7

Hughes, Tyler W., Momchil Minkov, Ian A. D. Williamson, and Shanhui Fan. "Adjoint Method and Inverse Design for Nonlinear Nanophotonic Devices." ACS Photonics 5, no. 12 (December 3, 2018): 4781–87. http://dx.doi.org/10.1021/acsphotonics.8b01522.

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8

Yuan, Hongyi, Zhouhui Liu, Maoliang Wei, Hongtao Lin, Xiaoyong Hu, and Cuicui Lu. "Topological Nanophotonic Wavelength Router Based on Topology Optimization." Micromachines 12, no. 12 (November 30, 2021): 1506. http://dx.doi.org/10.3390/mi12121506.

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The topological nanophotonic wavelength router, which can steer light with different wavelength signals into different topological channels, plays a key role in optical information processing. However, no effective method has been found to realize such a topological nanophotonic device. Here, an on-chip topological nanophotonic wavelength router working in an optical telecom band is designed based on a topology optimization algorithm and experimentally demonstrated. Valley photonic crystal is used to provide a topological state in the optical telecom band. The measured topological wavelength router has narrow signal peaks and is easy for integration. This work offers an efficient scheme for the realization of topological devices and lays a foundation for the future application of topological photonics.

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9

Mitrovic, Aleksandra, Bozica Bojovic, Dragomir Stamenkovic, and Dejana Popovic. "Characterization of surface roughness of new nanophotonic soft contact lenses using lacunarity and AFM method." Chemical Industry 72, no. 3 (2018): 157–66. http://dx.doi.org/10.2298/hemind170924004m.

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The aim of this study was to develop new soft contact lens (SCL) materials which would, after recommended and existing machining processes, improve surface roughness. Nanomaterials (fullerene, fullerol and methformin hydroxylate fullerene) were incorporated into commercial material for SCL (SL38) based on PHEMA, which were derived by the technology in the production lab of the company Soleko (Milan, Italy). Nanophotonic SCLs (SL38-A, SL38-B, SL38-C, respectively) were produced in the company Optix (Belgrade, Serbia) from the obtained materials. For the surface characterization of SCLs, AFM analysis and lacunarity method were performed. The results showed that for the SL38-B average roughness value is lower than those of SL38-A and SL38. The topography parameters of SL38-C were between the parameters of SL38-A and SL38-B. Lacunarity analysis of AFM images confirmed that SCLs surface state should belong to either group of adequate (slanted p-diagram) or inadequate (contorted p-diagram) roughness concerning tear film stability. Nanophotonic SCL SL38-C exibits more acceptable performance considering SCL surface functional behavior as compared to other SCLs. The positive result of incorporating nanomaterials into basic material for SCL is better quality of the nanophotonic SCLs surfaces. On the bases of these experiments, the assumption that incorporation of fullerene derivate will not increase surface roughness parameters is confirmed.

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10

Cui, Dan Feng, Chen Yang Xue, Xiao Gang Tong, Yu Jian Jin, and Wen Dong Zhang. "The Research of Nanophotonic Grating Vertical Coupling." Advanced Materials Research 284-286 (July 2011): 711–16. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.711.

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In this paper, we discuss the theory research and testing methods of a grating coupler. The grating coupling efficiency of parameters and the corresponding theoretical simulation was studied systematically. Meanwhile, the coupling efficiency in theory can be improved to 76% using an optimized grating design. The fabrication of the couplers in silicon-on-insulator is focusing on ion beam method (FIB). Using the tunable NewFocus laser with an adjustable extent of 1520~1570nm as the sources, Si waveguide grating is achieved vertical coupler through coupling a single-mode fiber with the diameter of 10.4. In the experiment, when the input wavelength is 1550nm, the maximum coupling efficiency is measured approximately 31% and 1 dB bandwidth is approximately 30 nm.

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11

Sushko, O. A., O. M. Bilash, and M. M. Rozhitskii. "115 Detection of organic carcinogens in water by nanophotonic method." Photodiagnosis and Photodynamic Therapy 9 (August 2012): S39. http://dx.doi.org/10.1016/s1572-1000(12)70116-3.

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12

Xu, Yi, Jun Yang, and Rami Melhem. "A Process-Variation-Tolerant Method for Nanophotonic On-Chip Network." ACM Journal on Emerging Technologies in Computing Systems 14, no. 2 (July 27, 2018): 1–23. http://dx.doi.org/10.1145/3208073.

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13

Wang, Kaiyuan, Xinshu Ren, Weijie Chang, Longhui Lu, Deming Liu, and Minming Zhang. "Inverse design of digital nanophotonic devices using the adjoint method." Photonics Research 8, no. 4 (March 24, 2020): 528. http://dx.doi.org/10.1364/prj.383887.

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14

Leung, D. M. H., B. M. A. Rahman, N. Kejalakshmy, and K. T. V. Grattan. "Characterization of silicon nanophotonic devices using the finite element method." Optical and Quantum Electronics 42, no. 8 (December 9, 2010): 499–509. http://dx.doi.org/10.1007/s11082-010-9425-8.

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15

Pan, Chengda, Yajie Bian, Yuchan Zhang, Shiyu Zhang, Xiaolei Zhang, Botao Wu, Qingyuan Jin, and E. Wu. "Flexible Silicon Dimer Nanocavity with Electric and Magnetic Enhancement." Photonics 9, no. 4 (April 18, 2022): 267. http://dx.doi.org/10.3390/photonics9040267.

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High-index dielectrics have recently been regarded as promising building blocks in nanophotonics owing to optical electric and magnetic Mie resonances. In particular, silicon is gaining great interest as the backbone of modern technology. Here, silicon dimer nanocavities with different sizes of silicon nanospheres were constructed using a probe nanomanipulation method and interacted with a few-layered R6G membrane to investigate the enhancement of electric and magnetic mode coupling. The evidence of the enhancement of fluorescence and slightly prolonged lifetime of R6G indicated the existence of nanocavities. In addition, the simulated electric and magnetic field distributions and decomposed mode of nanocavity were used to analyze the contribution of electric and magnetic modes to the R6G enhanced fluorescence. Such silicon dimer is a flexible nanocavity with electric and magnetic mode enhancement and has promising applications in sensing and all-dielectric metamaterials or nanophotonic devices.

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16

Häyrynen, Teppo, Jakob Rosenkrantz de Lasson, and Niels Gregersen. "Open-geometry Fourier modal method: modeling nanophotonic structures in infinite domains." Journal of the Optical Society of America A 33, no. 7 (June 9, 2016): 1298. http://dx.doi.org/10.1364/josaa.33.001298.

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17

Ivinskaya, A. M., A. V. Lavrinenko, and D. M. Shyroki. "Modeling of Nanophotonic Resonators With the Finite-Difference Frequency-Domain Method." IEEE Transactions on Antennas and Propagation 59, no. 11 (November 2011): 4155–61. http://dx.doi.org/10.1109/tap.2011.2164215.

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18

Wang, Yuqi, Amira Aouina, Hui Li, Ian O'Connor, Gabriela Nicolescu, and Sebastien Le Beux. "Thermal-Aware Design Method for Laser Group Control in Nanophotonic Interconnects." IEEE Transactions on Very Large Scale Integration (VLSI) Systems 27, no. 3 (March 2019): 742–46. http://dx.doi.org/10.1109/tvlsi.2018.2888589.

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19

Hughes, Tyler W., Momchil Minkov, Ian A. D. Williamson, and Shanhui Fan. "Correction to “Adjoint Method and Inverse Design for Nonlinear Nanophotonic Devices”." ACS Photonics 8, no. 5 (April 22, 2021): 1505. http://dx.doi.org/10.1021/acsphotonics.1c00396.

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20

Hoang, Thi Hong Cam, Thanh Binh Pham, Thuy Van Nguyen, Van Dai Pham, Huy Bui, Van Hoi Pham, Elena Duran, et al. "Hybrid Integrated Nanophotonic Silicon-based Structures." Communications in Physics 29, no. 4 (December 16, 2019): 481. http://dx.doi.org/10.15625/0868-3166/29/4/13855.

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We report nanophotonic silicon-based devices for hybrid integration: 1D photonic crystal (PhC) on optical fiber, i. e. fiber Bragg grating (FBG) sensing probe integrated in fiber laser structure for chemical sensors and slotted planar 2D PhC cavity combined with carbon nanotube (CNT) towards light nanosources. The experiments have been carried out by integrating 1D PhC on optical fiber in fiber laser structure. This structure possesses many advantages including high resolution for wavelength shift, high optical signal-to-noise ratio (OSNR) of about 50~dB, the small full width at half-maximum (FWHM) of about 0.014~nm therefore its accuracy is enhanced, as well as the precision and capability are achieved for remote sensing. Low nitrate concentration in water from 0 to 80 ppm has been used to demonstrate its sensing ability in the experiment. The proposed sensor can work with good repeatability, rapid response, and its sensitivity can be obtained of \(3.2\times 10^{ - 3}\) nm/ppm with the limit of detection (LOD) of 3~ppm. For 2D PhC cavity, enhancement of photoluminescence of CNT emission is observed. The semiconducting single-walled carbon nanotubes (s-SWNTs) solution was prepared by polymer-sorted method and coupled with the confined modes in silicon slotted PhC cavities. The enhancement ratio of 1.15 is obtained by comparing between the PL peaks at two confined modes of the cavity. The PL enhancement result of the integrated system shows the potential for the realization of on-chip nanoscale sources.

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21

Lenaerts, Joeri, Hannah Pinson, and Vincent Ginis. "Artificial neural networks for inverse design of resonant nanophotonic components with oscillatory loss landscapes." Nanophotonics 10, no. 1 (November 30, 2020): 385–92. http://dx.doi.org/10.1515/nanoph-2020-0379.

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AbstractMachine learning offers the potential to revolutionize the inverse design of complex nanophotonic components. Here, we propose a novel variant of this formalism specifically suited for the design of resonant nanophotonic components. Typically, the first step of an inverse design process based on machine learning is training a neural network to approximate the non-linear mapping from a set of input parameters to a given optical system’s features. The second step starts from the desired features, e.g. a transmission spectrum, and propagates back through the trained network to find the optimal input parameters. For resonant systems, this second step corresponds to a gradient descent in a highly oscillatory loss landscape. As a result, the algorithm often converges into a local minimum. We significantly improve this method’s efficiency by adding the Fourier transform of the desired spectrum to the optimization procedure. We demonstrate our method by retrieving the optimal design parameters for desired transmission and reflection spectra of Fabry–Pérot resonators and Bragg reflectors, two canonical optical components whose functionality is based on wave interference. Our results can be extended to the optimization of more complex nanophotonic components interacting with structured incident fields.

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22

Shi, Zujun, Shiqian Shao, and Yi Wang. "Improved the Surface Roughness of Silicon Nanophotonic Devices by Thermal Oxidation Method." Journal of Physics: Conference Series 276 (February 1, 2011): 012087. http://dx.doi.org/10.1088/1742-6596/276/1/012087.

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23

de Lasson, Jakob Rosenkrantz, Philip Trøst Kristensen, Jesper Mørk, and Niels Gregersen. "Roundtrip matrix method for calculating the leaky resonant modes of open nanophotonic structures." Journal of the Optical Society of America A 31, no. 10 (September 10, 2014): 2142. http://dx.doi.org/10.1364/josaa.31.002142.

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24

Lebbe, N., C. Dapogny, E. Oudet, K. Hassan, and A. Gliere. "Robust shape and topology optimization of nanophotonic devices using the level set method." Journal of Computational Physics 395 (October 2019): 710–46. http://dx.doi.org/10.1016/j.jcp.2019.06.057.

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25

Zouros, Grigorios P., Georgios D. Kolezas, Evangelos Almpanis, Konstantinos Baskourelos, Tomasz P. Stefański, and Kosmas L. Tsakmakidis. "Magnetic switching of Kerker scattering in spherical microresonators." Nanophotonics 9, no. 12 (July 10, 2020): 4033–41. http://dx.doi.org/10.1515/nanoph-2020-0223.

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AbstractMagneto-optical materials have become a key tool in functional nanophotonics, mainly due to their ability to offer active tuning between two different operational states in subwavelength structures. In the long-wavelength limit, such states may be considered as the directional forward- and back-scattering operations, due to the interplay between magnetic and electric dipolar modes, which act as equivalent Huygens sources. In this work, on the basis of full-wave electrodynamic calculations based on a rigorous volume integral equation (VIE) method, we demonstrate the feasibility of obtaining magnetically-tunable directionality inversion in spherical microresonators (THz antennas) coated by magneto-optical materials. In particular, our analysis reveals that when a high-index dielectric is coated with a magneto-optical material, we can switch the back-scattering of the whole particle to forward-scattering simply by turning off/on an external magnetic field bias. The validity of our calculations is confirmed by reproducing the above two-state operation, predicted by the VIE, with full-wave finite-element commercial software. Our results are of interest for the design of state-of-the-art active metasurfaces and metalenses, as well as for functional nanophotonic structures, and scattering and nanoantennas engineering.

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26

Fang, Weina, Sisi Jia, Jie Chao, Liqian Wang, Xiaoyang Duan, Huajie Liu, Qian Li, et al. "Quantizing single-molecule surface-enhanced Raman scattering with DNA origami metamolecules." Science Advances 5, no. 9 (September 2019): eaau4506. http://dx.doi.org/10.1126/sciadv.aau4506.

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Tailored metal nanoclusters have been actively developed to manipulate light at the subwavelength scale for nanophotonic applications. Nevertheless, precise arrangement of molecules in a hot spot with fixed numbers and positions remains challenging. Here, we show that DNA origami metamolecules with Fano resonances (DMFR) can precisely localize single dye molecules and produce quantified surface-enhanced Raman scattering (SERS) responses. To enable tailored plasmonic permutations, we develop a general and programmable method for anchoring a set of large gold nanoparticles (L-AuNPs) on prescribed n-tuple docking sites of super-origami DNA frameworks. A tetrameric nanocluster with four spatially organized 80-nm L-AuNPs exhibits peak-and-dip Fano characteristics. The drastic enhancement at the wavelength of the Fano minimum allows the collection of prominent SERS spectrum for even a single dye molecule. We expect that DMFR provides physical insights into single-molecule SERS and opens new opportunities for developing plasmonic nanodevices for ultrasensitive sensing, nanocircuits, and nanophotonic lasers.

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27

HARIDAS, M., and J. K. BASU. "HYBRID SEMICONDUCTING QUANTUM DOTS–METALLIC NANOPARTICLES ARRAYS FOR POSSIBLE NANOPHOTONIC DEVICES." International Journal of Nanoscience 10, no. 04n05 (August 2011): 1113–18. http://dx.doi.org/10.1142/s0219581x11009519.

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Arrays of quantum dots and hybrid arrays of semiconducting quantum dots and metallic nanoparticles have wide range of potential applications from nanophotonics to quantum information processing. Creating such arrays with well-defined morphology and order over a large area is a challenge. We present a reliable method for constructing such arrays using simple self assembly technique. The reliability of the method is verified using AFM. The emission properties of such system are studied using high resolution imaging techniques and we have given the possible explanation for the observed phenomena.

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28

Häyrynen, Teppo, Andreas Dyhl Osterkryger, Jakob Rosenkrantz de Lasson, and Niels Gregersen. "Modeling open nanophotonic systems using the Fourier modal method: generalization to 3D Cartesian coordinates." Journal of the Optical Society of America A 34, no. 9 (August 23, 2017): 1632. http://dx.doi.org/10.1364/josaa.34.001632.

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29

Ayoub, Ahmed B., and Mohamed A. Swillam. "Accurate and efficient leap-frog beam propagation method for modeling micro and nanophotonic structures." Applied Optics 59, no. 23 (August 3, 2020): 6881. http://dx.doi.org/10.1364/ao.398025.

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30

Taleb, Sarah M., Makram A. Fakhri, and Salah Aldeen Adnan. "Optical Investigations of Nanophotonic LiNbO₃ Films Deposited by Pulsed Laser Deposition Method." Defect and Diffusion Forum 398 (January 2020): 16–22. http://dx.doi.org/10.4028/www.scientific.net/ddf.398.16.

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The nanocrystalline structure of Lithium niobate (LiNbO3) was prepared and deposited onto substrate made of quartz by utilize pulse laser deposition technique. The effect of substrate temperature on the structural, optical and morphological properties of lithium niobate photonic film grown was studied. The chemical mixture was prepared by mixing the raw material (Li2CO3, Nb2O5) with Ethanol liquid without any further purification, at time of stirrer 3hrs but without heating, then annealing process the formed material at 1000C° for 4hrs. We characterized and analyzed the LiNbO3 nanostructure thin films by utilize Ultra-Violet Visible (UV-vis). The UV-vis measurements show that, when the substrate temperature increases, the values of transmission, absorption and energy band gap will decreased, but the values of reflection and refractive index will increased. That means the LiNbO3 thin film prepared at substrate temperatures 300C° give the best result for manufacture the optical waveguide.

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31

Yatsui, T., Y. Ryu, T. Morishima, W. Nomura, T. Kawazoe, T. Yonezawa, M. Washizu, H. Fujita, and M. Ohtsu. "Self-assembly method of linearly aligning ZnO quantum dots for a nanophotonic signal transmission device." Applied Physics Letters 96, no. 13 (March 29, 2010): 133106. http://dx.doi.org/10.1063/1.3372639.

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32

Li, Hongqiang, Wenqian Zhou, Meiling Zhang, Yu Liu, Cheng Zhang, Enbang Li, Changyun Miao, and Chunxiao Tang. "Large-Area Binary Blazed Grating Coupler between Nanophotonic Waveguide and LED." Scientific World Journal 2014 (2014): 1–6. http://dx.doi.org/10.1155/2014/586517.

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A large-area binary blazed grating coupler for the arrayed waveguide grating (AWG) demodulation integrated microsystem on silicon-on-insulator (SOI) was designed for the first time. Through the coupler, light can be coupled into the SOI waveguide from the InP-based C-band LED for the AWG demodulation integrated microsystem to function. Both the length and width of the grating coupler are 360 μm, as large as the InP-based C-band LED light emitting area in the system. The coupler was designed and optimized based on the finite difference time domain method. When the incident angle of the light source is0°, the coupling efficiency of the binary blazed grating is 40.92%, and the 3 dB bandwidth is 72 nm at a wavelength of 1550 nm.

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33

Akhtar, Sophia, Shrawan Roy, Trang Thu Tran, Jaspal Singh, Anir S. Sharbirin, and Jeongyong Kim. "Low Temperature Step Annealing Synthesis of the Ti2AlN MAX Phase to Fabricate MXene Quantum Dots." Applied Sciences 12, no. 9 (April 20, 2022): 4154. http://dx.doi.org/10.3390/app12094154.

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We present the synthesis of the Ti2AlN MAX phase using two-step annealing at temperatures of 600 °C and 1100 °C, the lowest synthesis temperatures reported so far. After the successful synthesis of the Ti2AlN MAX phase, two-dimensional Ti2N MXene was prepared through wet chemical etching and further fragmented into light emitting MXene quantum dots (MQDs) with a size of 3.2 nm by hydrothermal method. Our MQDs displayed a 6.9% quantum yield at a 310 nm wavelength of excitation, suggesting promising nanophotonic applications.

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34

Kim, Hwi, and Byoungho Lee. "Mathematical modeling of crossed nanophotonic structures with generalized scattering-matrix method and local Fourier modal analysis." Journal of the Optical Society of America B 25, no. 4 (March 20, 2008): 518. http://dx.doi.org/10.1364/josab.25.000518.

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35

Ghoshal, Sib Krishna, Masni Shafie@Haron, and M. R. Sahar. "Luminescence Features of Silver Nanoparticles Sensitized Samarium Doped Boro-Zinc Tellurite Glasses." Materials Science Forum 846 (March 2016): 96–101. http://dx.doi.org/10.4028/www.scientific.net/msf.846.96.

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Spectral features modification of rare earth (RE) doped tellurite glasses via controlled manipulation of metallic nanoparticles (NPs) is the current challenge in achieving enhanced lasing action. Triggering the localized surface plasmon resonance (SPR) of NPs in the glass generates tremendous applied interests especially in solid state lasers and nanophotonics. Despite several promising features of RE doped zinc-boro-tellurite glass, the low absorption and emission cross-section of RE ions prohibit them from fabricating efficient lasers. This drawback needed to overcome and significant enhancement of spectral features is required. Co-doping by rare earths and/or embedding metallic NPs (acts as sensitizer) are demonstrated to be the alternative route to surmount such shortcomings. Series of glass samples with composition 74TeO2–15B2O3–10ZnO– 1Sm2O3 – (x)Ag, where 0 ≤ x ≤ 0.1 mol% (in excess) are prepared using melt quenching method and the impacts of silver (Ag) NPs concentrations in altering their photoluminescence properties are inspected. The XRD spectra confirmed the amorphous nature of prepared glasses and the presence of Ag NPs are evidenced in EDX spectra. TEM micrographs revealed the distribution of Ag NPs with average size 7.2 nm. Absorption spectra revealed eight bands which most intense between 6F11/2 and 6F1/2. Photoluminescence spectra exhibited three prominent peaks corresponding to the transition from the excited state 4G5/2 to 6H5/2, 6H7/2, and 6H9/2 states, respectively. Our observation may be useful for the development of tellurite glass based nanophotonic devices.

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36

Yatsui, Takashi, Fumihiro Morigaki, and Tadashi Kawazoe. "Controlling the optical and structural properties of ZnS–AgInS2 nanocrystals by using a photo-induced process." Beilstein Journal of Nanotechnology 5 (October 14, 2014): 1767–73. http://dx.doi.org/10.3762/bjnano.5.187.

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ZnS–AgInS2 (ZAIS) solid-solution nanocrystals are promising materials for nanophotonic devices in the visible region because of their low toxicity and good emission properties. We developed a technique of photo-induced synthesis to control the size and composition of the ZAIS nanocrystals. This method successfully decreased the defect levels, as well as the size and size variation of ZAIS nanocrystals by controlling the excitation wavelength during synthesis. Detailed analysis of transmission electron microscope images confirmed that the photo-induced synthesis yielded a high crystallinity of the ZAIS nanocrystals with small variations in size and content.

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Yao, Kan, Rohit Unni, and Yuebing Zheng. "Intelligent nanophotonics: merging photonics and artificial intelligence at the nanoscale." Nanophotonics 8, no. 3 (January 25, 2019): 339–66. http://dx.doi.org/10.1515/nanoph-2018-0183.

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AbstractNanophotonics has been an active research field over the past two decades, triggered by the rising interests in exploring new physics and technologies with light at the nanoscale. As the demands of performance and integration level keep increasing, the design and optimization of nanophotonic devices become computationally expensive and time-inefficient. Advanced computational methods and artificial intelligence, especially its subfield of machine learning, have led to revolutionary development in many applications, such as web searches, computer vision, and speech/image recognition. The complex models and algorithms help to exploit the enormous parameter space in a highly efficient way. In this review, we summarize the recent advances on the emerging field where nanophotonics and machine learning blend. We provide an overview of different computational methods, with the focus on deep learning, for the nanophotonic inverse design. The implementation of deep neural networks with photonic platforms is also discussed. This review aims at sketching an illustration of the nanophotonic design with machine learning and giving a perspective on the future tasks.

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38

Zhong, Yangwan, Qi Wang, Jing Wen, Dawei Zhang, and Songlin Zhuang. "High-Efficiency Plasmonic Lens Based on Archimedes-Spiral with Cross Section of an Asymmetric Slot." Crystals 12, no. 3 (February 24, 2022): 316. http://dx.doi.org/10.3390/cryst12030316.

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A high-efficiency plasmonic lens composed of a single Archimedes-spiral slot with a cross section of an asymmetric slot is proposed. By adding an auxiliary nanocavity under the primary spiral slot, unidirectional plasmonic waves can be efficiently transmitted in the inward direction and focused on a hot spot in the center. Due to the asymmetric slot, the finite-difference time-domain (FDTD) method is used to numerically optimize the geometric parameters of the single spiral slot, which can achieve high-intensity unidirectional inward focusing. The proposed structure can decrease background noises and prevent cross-talk of nearby components in optical networks, which significantly improves the integration level of nanophotonic circuits and devices.

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Song, Jun, Linchun Chen, and Bojun Li. "A FAST SIMULATION METHOD OF SILICON NANOPHOTONIC ECHELLE GRATINGS AND ITS APPLICATIONS IN THE DESIGN OF ON-CHIP SPECTROMETERS." Progress In Electromagnetics Research 141 (2013): 369–82. http://dx.doi.org/10.2528/pier13052801.

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40

Chew, Xiong Yeu, Guang Ya Zhou, and Fook Siong Chau. "Novel Doubly Nano-Scale Perturbative Resonance Control of a Free-Suspending Photonic Crystal Structure." Applied Mechanics and Materials 83 (July 2011): 147–50. http://dx.doi.org/10.4028/www.scientific.net/amm.83.147.

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The impact of developing nanophotonic components have proven to be a promising research on the future optical integrated circuit complementing the current scaling of semiconductors for faster board-board, chip-chip interconnect speeds. Essentially photonic crystals (PhC) symbolize an emerging class of periodic nanomaterials that offers flexibilities in achieving novel devices. Based on the investigations of the high-Q resonance mode energy distributions, we optimized the nanoscale tip for optimal perturbative effect with low loss resonance control in the optical near field regime. In this study to achieve larger spectral resonance, we proposed using a novel doubly nanoscale perturbative tip to achieve optimal accurate photonic crystal resonance control. Such method may be driven by a nano-electromechanical (NEMS) system that may be fabricated with monolithic approaches.

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41

Zhang, Xiaoyu, Shubin Yan, Jilai Liu, Yifeng Ren, Yi Zhang, and Lifang Shen. "Refractive Index Sensor Based on a Metal-Insulator-Metal Bus Waveguide Coupled with a U-Shaped Ring Resonator." Micromachines 13, no. 5 (May 9, 2022): 750. http://dx.doi.org/10.3390/mi13050750.

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In this study, a novel refractive index sensor structure was designed consisting of a metal-insulator-metal (MIM) waveguide with two rectangular baffles and a U-Shaped Ring Resonator (USRR). The finite element method was used to theoretically investigate the sensor’s transmission characteristics. The simulation results show that Fano resonance is a sharp asymmetric resonance generated by the interaction between the discrete narrow-band mode and the successive wide-band mode. Next, the formation of broadband and narrowband is further studied, and finally the key factors affecting the performance of the sensor are obtained. The best sensitivity of this refractive-index sensor is 2020 nm/RIU and the figure of merit (FOM) is 53.16. The presented sensor has the potential to be useful in nanophotonic sensing applications.

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42

Leitis, Aleksandrs, Andreas Tittl, Mingkai Liu, Bang Hyun Lee, Man Bock Gu, Yuri S. Kivshar, and Hatice Altug. "Angle-multiplexed all-dielectric metasurfaces for broadband molecular fingerprint retrieval." Science Advances 5, no. 5 (May 2019): eaaw2871. http://dx.doi.org/10.1126/sciadv.aaw2871.

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Infrared spectroscopy resolves the structure of molecules by detecting their characteristic vibrational fingerprints. Subwavelength light confinement and nanophotonic enhancement have extended the scope of this technique for monolayer studies. However, current approaches still require complex spectroscopic equipment or tunable light sources. Here, we introduce a novel metasurface-based method for detecting molecular absorption fingerprints over a broad spectrum, which combines the device-level simplicity of state-of-the-art angle-scanning refractometric sensors with the chemical specificity of infrared spectroscopy. Specifically, we develop germanium-based high-Q metasurfaces capable of delivering a multitude of spectrally selective and surface-sensitive resonances between 1100 and 1800 cm−1. We use this approach to detect distinct absorption signatures of different interacting analytes including proteins, aptamers, and polylysine. In combination with broadband incoherent illumination and detection, our method correlates the total reflectance signal at each incidence angle with the strength of the molecular absorption, enabling spectrometer-less operation in a compact angle-scanning configuration ideally suited for field-deployable applications.

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Chou Chao, Chung-Ting, Yuan-Fong Chou Chau, Sy-Hann Chen, Hung Ji Huang, Chee Ming Lim, Muhammad Raziq Rahimi Kooh, Roshan Thotagamuge, and Hai-Pang Chiang. "Ultrahigh Sensitivity of a Plasmonic Pressure Sensor with a Compact Size." Nanomaterials 11, no. 11 (November 21, 2021): 3147. http://dx.doi.org/10.3390/nano11113147.

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This study proposes a compact plasmonic metal-insulator-metal pressure sensor comprising a bus waveguide and a resonator, including one horizontal slot and several stubs. We calculate the transmittance spectrum and the electromagnetic field distribution using the finite element method. When the resonator’s top layer undergoes pressure, the resonance wavelength redshifts with increasing deformation, and their relation is nearly linear. The designed pressure sensor possesses the merits of ultrahigh sensitivity, multiple modes, and a simple structure. The maximum sensitivity and resonance wavelength shift can achieve 592.44 nm/MPa and 364 nm, respectively, which are the highest values to our knowledge. The obtained sensitivity shows 23.32 times compared to the highest one reported in the literature. The modeled design paves a promising path for applications in the nanophotonic field.

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Shi, Haoran, Shubin Yan, Xiaoyu Yang, Xiushan Wu, Wenchang Wu, and Ertian Hua. "A Nanosensor Based on a Metal-Insulator-Metal Bus Waveguide with a Stub Coupled with a Racetrack Ring Resonator." Micromachines 12, no. 5 (April 27, 2021): 495. http://dx.doi.org/10.3390/mi12050495.

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A nanostructure comprising the metal-insulator-metal (MIM) bus waveguide with a stub coupled with a racetrack ring resonator is designed. The spectral characteristics of the proposed structure are analyzed via the finite element method (FEM). The results show that there is a sharp Fano resonance profile and electromagnetically induced transparency (EIT)-like effect, which are excited by a coupling between the MIM bus waveguide with a stub and the racetrack ring resonator. The normalized HZ field is affected by the displacement of the ring from the stub x greatly. The influence of the geometric parameters of the sensor design on the sensing performance is discussed. The sensitivity of the proposed structure can reach 1774 nm/RIU with a figure of merit of 61. The proposed structure has potential in nanophotonic sensing applications.

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45

Romeira, Bruno, José M. L. Figueiredo та Julien Javaloyes. "NanoLEDs for energy-efficient and gigahertz-speed spike-based sub-λ neuromorphic nanophotonic computing". Nanophotonics 9, № 13 (25 червня 2020): 4149–62. http://dx.doi.org/10.1515/nanoph-2020-0177.

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AbstractEvent-activated biological-inspired subwavelength (sub-λ) photonic neural networks are of key importance for future energy-efficient and high-bandwidth artificial intelligence systems. However, a miniaturized light-emitting nanosource for spike-based operation of interest for neuromorphic optical computing is still lacking. In this work, we propose and theoretically analyze a novel nanoscale nanophotonic neuron circuit. It is formed by a quantum resonant tunneling (QRT) nanostructure monolithic integrated into a sub-λ metal-cavity nanolight-emitting diode (nanoLED). The resulting optical nanosource displays a negative differential conductance which controls the all-or-nothing optical spiking response of the nanoLED. Here we demonstrate efficient activation of the spiking response via high-speed nonlinear electrical modulation of the nanoLED. A model that combines the dynamical equations of the circuit which considers the nonlinear voltage-controlled current characteristic, and rate equations that takes into account the Purcell enhancement of the spontaneous emission, is used to provide a theoretical framework to investigate the optical spiking dynamic properties of the neuromorphic nanoLED. We show inhibitory- and excitatory-like optical spikes at multi-gigahertz speeds can be achieved upon receiving exceptionally low (sub-10 mV) synaptic-like electrical activation signals, lower than biological voltages of 100 mV, and with remarkably low energy consumption, in the range of 10–100 fJ per emitted spike. Importantly, the energy per spike is roughly constant and almost independent of the incoming modulating frequency signal, which is markedly different from conventional current modulation schemes. This method of spike generation in neuromorphic nanoLED devices paves the way for sub-λ incoherent neural elements for fast and efficient asynchronous neural computation in photonic spiking neural networks.

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Lv, Jingwei, Xiaoming Zhang, Xuntao Yu, Haiwei Mu, Qiang Liu, Chao Liu, Tao Sun, and Paul K. Chu. "Forward and Backward Unidirectional Scattering by the Core-Shell Nanocube Dimer with Balanced Gain and Loss." Nanomaterials 10, no. 8 (July 23, 2020): 1440. http://dx.doi.org/10.3390/nano10081440.

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An optical nanoantenna consisting of a Au-dielectric core-shell nanocube dimer with switchable directionality was designed and described. Our theoretical model and numerical simulation showed that switching between forward and backward directions can be achieved with balanced gain and loss, using a single element by changing the coefficient κ in the core, which can be defined by the relative phase of the polarizability. The optical response indicated a remarkable dependence on the coefficient κ in the core as well as frequency. The location of the electric field enhancement was specified by the different coefficient κ and, furthermore, the chained optical nanoantenna and coupled electric dipole emitted to the optical nanoantenna played significant roles in unidirectional scattering. This simple method to calculate the feasibility of unidirectional and switchable scattering provides an effective strategy to explore the functionalities of nanophotonic devices.

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Tittl, Andreas, Aleksandrs Leitis, Mingkai Liu, Filiz Yesilkoy, Duk-Yong Choi, Dragomir N. Neshev, Yuri S. Kivshar, and Hatice Altug. "Imaging-based molecular barcoding with pixelated dielectric metasurfaces." Science 360, no. 6393 (June 7, 2018): 1105–9. http://dx.doi.org/10.1126/science.aas9768.

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Metasurfaces provide opportunities for wavefront control, flat optics, and subwavelength light focusing. We developed an imaging-based nanophotonic method for detecting mid-infrared molecular fingerprints and implemented it for the chemical identification and compositional analysis of surface-bound analytes. Our technique features a two-dimensional pixelated dielectric metasurface with a range of ultrasharp resonances, each tuned to a discrete frequency; this enables molecular absorption signatures to be read out at multiple spectral points, and the resulting information is then translated into a barcode-like spatial absorption map for imaging. The signatures of biological, polymer, and pesticide molecules can be detected with high sensitivity, covering applications such as biosensing and environmental monitoring. Our chemically specific technique can resolve absorption fingerprints without the need for spectrometry, frequency scanning, or moving mechanical parts, thereby paving the way toward sensitive and versatile miniaturized mid-infrared spectroscopy devices.

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WANG, BAOMIN, TONGCHUAN GAO, and PAUL W. LEU. "COMPUTATIONAL SIMULATIONS OF NANOSTRUCTURED SOLAR CELLS." Nano LIFE 02, no. 02 (June 2012): 1230007. http://dx.doi.org/10.1142/s1793984411000517.

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Simulation methods are vital to the development of next-generation solar cells such as plasmonic, organic, nanophotonic, and semiconductor nanostructure solar cells. Simulations are predictive of material properties such that they may be used to rapidly screen new materials and understand the physical mechanisms of enhanced performance. They can be used to guide experiments or to help understand results obtained in experiments. In this paper, we review simulation methods for modeling the classical optical and electronic transport properties of nanostructured solar cells. We discuss different techniques for light trapping with an emphasis on silicon nanostructures and silicon thin films integrated with nanophotonics and plasmonics.

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Son, Gyeongho, Seungjun Han, Jongwoo Park, Kyungmok Kwon, and Kyoungsik Yu. "High-efficiency broadband light coupling between optical fibers and photonic integrated circuits." Nanophotonics 7, no. 12 (October 20, 2018): 1845–64. http://dx.doi.org/10.1515/nanoph-2018-0075.

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AbstractEfficient light energy transfer between optical waveguides has been a critical issue in various areas of photonics and optoelectronics. Especially, the light coupling between optical fibers and integrated waveguide structures provides essential input-output interfaces for photonic integrated circuits (PICs) and plays a crucial role in reliable optical signal transport for a number of applications, such as optical interconnects, optical switching, and integrated quantum optics. Significant efforts have been made to improve light coupling properties, including coupling efficiency, bandwidth, polarization dependence, alignment tolerance, as well as packing density. In this review article, we survey three major light coupling methods between optical fibers and integrated waveguides: end-fire coupling, diffraction grating-based coupling, and adiabatic coupling. Although these waveguide coupling methods are different in terms of their operating principles and physical implementations, they have gradually adopted various nanophotonic structures and techniques to improve the light coupling properties as our understanding to the behavior of light and nano-fabrication technology advances. We compare the pros and cons of each light coupling method and provide an overview of the recent developments in waveguide coupling between optical fibers and integrated photonic circuits.

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TEO, SELIN H. G., A. Q. LIU, J. SINGH, M. B. YU, H. Q. SUN, and N. SINGH. "SUB-100 nm LITHOGRAPHY WITH PATTERN AND PARTIAL COHERENCE CONTROL." International Journal of Nanoscience 05, no. 04n05 (August 2006): 383–88. http://dx.doi.org/10.1142/s0219581x06004516.

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This paper describes optical patterning of sub-lithographic wavelength features using only conventional chrome-on-glass binary photomasks without phase-shift features. The sub-100 nm patterns were obtained through manipulation of masks bias designs and partial coherence control of the lithographic radiation. The key factors in the design of experiments are the density and design of masks patterns and the partial coherence of exposure radiation system used. Based on the study, smallest resolution of 36% that of designed value can be obtained for features of 75 nm using a 200 nm designed line width. Besides indication of proposed process' resolution limits for further applications, advantages of the method allows its application to applications requiring sub-100 nm critical dimensions through use of biased pattern designs, especially feasible in devices such as deep sub-micrometer comb drives actuators in nano-microelectromechanical structures; metal–semiconductor–metal photodetectors, and nanophotonic crystal structures, etc.

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