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Добірка наукової літератури з теми "VISIBLE PHOTONIC"

Автор: Grafiati

Опубліковано: 11 вересня 2023

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Статті в журналах з теми "VISIBLE PHOTONIC"

Dong, Mark, David Heim, Alex Witte, Genevieve Clark, Andrew J. Leenheer, Daniel Dominguez, Matthew Zimmermann, et al. "Piezo-optomechanical cantilever modulators for VLSI visible photonics." APL Photonics 7, no. 5 (May 1, 2022): 051304. http://dx.doi.org/10.1063/5.0088424.

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Visible-wavelength very large-scale integration photonic circuits have a potential to play important roles in quantum information and sensing technologies. The realization of scalable, high-speed, and low-loss photonic mesh circuits depends on reliable and well-engineered visible photonic components. Here, we report a low-voltage optical phase shifter based on piezo-actuated mechanical cantilevers, fabricated on a CMOS compatible, 200 mm wafer-based visible photonics platform. We show linear phase and amplitude modulation with 6 Vπ cm in differential operation, −1.5 to −2 dB insertion loss, and up to 40 dB contrast in the 700–780 nm range. By adjusting selected cantilever parameters, we demonstrate a low-displacement and a high-displacement device, both exhibiting a nearly flat frequency response from DC to a peak mechanical resonance at 23 and 6.8 MHz respectively, which, through resonant enhancement of Q ∼ 40, further decreases the operating voltage down to 0.15 Vπ cm.

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González-Fernández, Alfredo A., Mariano Aceves-Mijares, Oscar Pérez-Díaz, Joaquin Hernández-Betanzos, and Carlos Domínguez. "Embedded Silicon Nanoparticles as Enabler of a Novel CMOS-Compatible Fully Integrated Silicon Photonics Platform." Crystals 11, no. 6 (May 31, 2021): 630. http://dx.doi.org/10.3390/cryst11060630.

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The historical bottleneck for truly high scale integrated photonics is the light emitter. The lack of monolithically integrable light sources increases costs and reduces scalability. Quantum phenomena found in embedded Si particles in the nanometer scale is a way of overcoming the limitations for bulk Si to emit light. Integrable light sources based in Si nanoparticles can be obtained by different CMOS (Complementary Metal Oxide Semiconductor) -compatible materials and techniques. Such materials in combination with Si3N4 photonic elements allow for integrated Si photonics, in which photodetectors can also be included directly in standard Si wafers, taking advantage of the emission in the visible range by the embedded Si nanocrystals/nanoparticles. We present the advances and perspectives on seamless monolithic integration of CMOS-compatible visible light emitters, photonic elements, and photodetectors, which are shown to be viable and promising well within the technological limits imposed by standard fabrication methods.

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Apostolaki, Maria-Athina, Alexia Toumazatou, Maria Antoniadou, Elias Sakellis, Evangelia Xenogiannopoulou, Spiros Gardelis, Nikos Boukos, Polycarpos Falaras, Athanasios Dimoulas, and Vlassis Likodimos. "Graphene Quantum Dot-TiO2 Photonic Crystal Films for Photocatalytic Applications." Nanomaterials 10, no. 12 (December 21, 2020): 2566. http://dx.doi.org/10.3390/nano10122566.

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Photonic crystal structuring has emerged as an advanced method to enhance solar light harvesting by metal oxide photocatalysts along with rational compositional modifications of the materials’ properties. In this work, surface functionalization of TiO2 photonic crystals by blue luminescent graphene quantum dots (GQDs), n–π* band at ca. 350 nm, is demonstrated as a facile, environmental benign method to promote photocatalytic activity by the combination of slow photon-assisted light trapping with GQD-TiO2 interfacial electron transfer. TiO2 inverse opal films fabricated by the co-assembly of polymer colloidal spheres with a hydrolyzed titania precursor were post-modified by impregnation in aqueous GQDs suspension without any structural distortion. Photonic band gap engineering by varying the inverse opal macropore size resulted in selective performance enhancement for both salicylic acid photocatalytic degradation and photocurrent generation under UV–VIS and visible light, when red-edge slow photons overlapped with the composite’s absorption edge, whereas stop band reflection was attenuated by the strong UVA absorbance of the GQD-TiO2 photonic films. Photoelectrochemical and photoluminescence measurements indicated that the observed improvement, which surpassed similarly modified benchmark mesoporous P25 TiO2 films, was further assisted by GQDs electron acceptor action and visible light activation to a lesser extent, leading to highly efficient photocatalytic films.

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Artundo, Iñigo. "Photonic Integration: New Applications Are Visible." Optik & Photonik 12, no. 3 (June 2017): 22–25. http://dx.doi.org/10.1002/opph.201700015.

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Han, Qi, Lei Jin, Yongqi Fu, and Weixing Yu. "Si Substrate-Based Metamaterials for Ultrabroadband Perfect Absorption in Visible Regime." Journal of Nanomaterials 2014 (2014): 1–5. http://dx.doi.org/10.1155/2014/893202.

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We report the broadband efficient light absorbing property of a structure of quadrangular frustum pyramid array in visible regime. The structure can absorb light efficiently with an average absorptivity of 0.98 over the whole visible waveband. In addition, it is found that this kind of super light absorbing can maintain an average of 0.9 for a wide incident angle range. The perfect absorbing property of the metamaterial-based nanoring array is attributed to the effect of the Fabry-Perot resonance. The structure is possible to be used as a type of Si photonics devices in future photonic circuits.

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Jalil, Bushra, Bilal Hussain, Maria Pascali, Giovanni Serafino, Davide Moroni, and Paolo Ghelfi. "A Preliminary Study on Non Contact Thermal Monitoring of Microwave Photonic Systems." Proceedings 27, no. 1 (September 23, 2019): 19. http://dx.doi.org/10.3390/proceedings2019027019.

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Microwave photonic systems are more susceptible to thermal fluctuations due to thermo-optic effect. In order to stabilize the performance of photonic components, thermal monitoring is achieved by using thermistors placed at any arbitrary location along the component. This work presents non contact thermography of a fully functional microwave photonic system. The temperature profile of printed circuit board (PCB) and photonic integrated circuit (PIC) is obtained using Fluke FLIR (A65) camera. We performed Otsu’s thresholding to segment heat centers located across PCB as well as PIC. The infrared and visible cameras used in this work have different field of view, therefore, after applying morphological methods, we performed image registration to synchronize both visible and thermal images. We demonstrate this method on the circuit board with active electrical/photonic elements and were able to observe thermal profile of these components.

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Wang, Ning, Yu Peng Zhang, Lei Lei, Helen L. W. Chan, and Xu Ming Zhang. "Photocatalytic Microreactor Using Monochromatic Visible Light." Advanced Materials Research 254 (May 2011): 219–22. http://dx.doi.org/10.4028/www.scientific.net/amr.254.219.

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A photocatalytic planar reactor with an immobilized nanoporous BiVO4 film has been integrated with a blue-light panel LED, which acts as the light source. The microreactor utilizes two BiVO4-coated glasses as the top and the bottom layer and a UV curable resin layer as the spacer. The UV spacer is patterned with tree-shaped microchannels and a reaction chamber (10 ´ 10 ´ 0.1 mm3). It was found that under blue light of 140 mW/cm2 (the LED is powered at 11 V, 402 nm ) and the flow rate of 37.5 µl/min, the microreactor has the optimum performance with a degradation rate of about 3%/s and a photonic utilization efficiency ³ 0.02%. However, the photonic efficiency can be improved to 0.3% when LED is powered at 9 V.

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Zhdanova, N., A. Pakhomov, S. Rodionov, Yu Strokova, S. Svyakhovskiy, and A. Saletskii. "Spectroscopic Analysis of Fluorescent Proteins Infiltrated into Photonic Crystals-=SUP=-*-=/SUP=-." Журнал технической физики 129, no. 7 (2020): 909. http://dx.doi.org/10.21883/os.2020.07.49561.47-20.

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Spectral properties of enhanced-green uorescent protein and monomeric red uorescent protein in porous photonic structures have been studied. The uorescent proteins were successfully inЛtrated into porous silicon photonic structures with dirent positions of the photonic band gap in visible spectral range. The intensity of uorescence is enhanced in the spectral regions of high photonic density of states. The possibility to control the uorescence spectra by the structure with the photonic band gap is demonstrated. Keywords: photonic crystals, porous silicon, uorescent proteins, photonic band gap.

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Yoon, Jongseung, Wonmok Lee, and Edwin L. Thomas. "Self-Assembly of Block Copolymers for Photonic-Bandgap Materials." MRS Bulletin 30, no. 10 (October 2005): 721–26. http://dx.doi.org/10.1557/mrs2005.270.

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AbstractSelf-assembled block copolymer systems with an appropriate molecular weight to produce a length scale that will interact with visible light are an alternative platform material for the fabrication of large-area, well-ordered photonic-bandgap structures at visible and near-IR frequencies.Over the past years, one-, two-, and three-dimensional photonic crystals have been demonstrated with various microdomain structures created through microphase separation of block copolymers. The size and shape of periodic microstructures of block copolymers can be readily tuned by molecular weight, relative composition of the copolymer, and blending with homopolymers or plasticizers.The versatility of photonic crystals based on block copolymers is further increased by incorporating inorganic nanoparticles or liquid-crystalline guest molecules (or using a liquid-crystalline block), or by selective etching of one of the microdomains and backfilling with high-refractive-index materials. This article presents an overview of photonic-bandgap materials enabled by self-assembled block copolymers and discusses the morphology and photonic properties of block-copolymer-based photonic crystals containing nanocomposite additives.We also provide a view of the direction of future research, especially toward novel photonic devices.

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Chen, Yi-Jia, and Tse-Shan Lin. "Enhancement of Visible-Light Photocatalytic Efficiency of TiO2 Nanopowder by Anatase/Rutile Dual Phase Formation." Applied Sciences 10, no. 18 (September 12, 2020): 6353. http://dx.doi.org/10.3390/app10186353.

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Visible-light photocatalytically active titanium oxide (TiO2) nano-powder was synthesized by a flat-flame chemical vapor condensation method. The formation of TiO2 consisting of different ratios of anatase and rutile phases was controlled by two parameters: the acetylene flow rate (C2H2, 600 sccm and 800 sccm) and the acetylene/oxygen flow ratio (C2H2/O2, 1:3, 1:4, 1:5, and 1:6). The location of the photonic center was identified for visible-light absorption, which is in the anatase grains. The photonic center on the surface of anatase grains happens to be the nucleation site for rutile in an oxygen-deficient environment. The visible-light absorption could be attributed to the formation of defect levels related to the photonic center within the band gap of anatase. The major role of the mixed-phase structure of TiO2 in the enhancement of visible-light photocatalytic activity is in the enhancement of carrier separation and not of light harvest, for the powder produced in this study.

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Більше джерел

Дисертації з теми "VISIBLE PHOTONIC"

González, Xavier (Xavier R. González Barrios). "Edible photonic crystals tunable within the visible regime." Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/112496.

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Thesis: S.B., Massachusetts Institute of Technology, Department of Materials Science and Engineering, 2010.
Cataloged from PDF version of thesis.
Includes bibliographical references (pages 50-52).
An experimental study was performed to design and fabricate an edible photonic crystal made of alternating layers of food grade titanium dioxide and agar that is able to selectively reflect wavelengths of light within the visible spectrum and allow for dynamic color changes through the tuning mechanism of swelling its agar layers with the addition of edible solvents. After doing a literature search to discover which materials were available to create this edible photonic structure, a trial and error process was conducted using deposition and film thickness characterization techniques to optimize the physical and optical characteristics of the layers composing the photonic structure. The materials selected for the layers in the structure yield a high refractive index contrast, which allows for high reflectivity with a reduced amount of total layers. The multilayer stack can be designed to reflect particular wavelengths by selecting the thickness of the layers accordingly. Thin film characterization took place through the use of profilometry, ellipsometry, and atomic force microscopy. The feasibility and practicality of two manufacturing techniques, spin-coating and RF-sputtering, were analyzed in the process of learning how to assemble an edible multilayer stack for molecular gastronomy applications.
by Xavier González/
S.B.

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CALAFIORE, GIUSEPPE. "Nanoimprinting of Photonic Devices for Visible Light Applications." Doctoral thesis, Politecnico di Torino, 2016. http://hdl.handle.net/11583/2640840.

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The science of photonics is increasingly enabling the discovery of unprecedented proprieties that stem from the interaction of light with nanostructured matter. On the other hand, nanotechnology provides a key support to the research in photonics. In particular nanoimprint lithography (NIL) proved important to accelerate the development and prototyping of novel photonic device concepts. In this thesis, NIL was analyzed as a suitable, flexible, low-cost lithography solution for photonics. The purpose of this work is to research and evaluate novel nanofabrication technologies, materials and device concepts to support and innovate the fields of photonics and nanotechnology. In doing so, different implementations of NIL were experimentally investigated on the imprint of novel photonic devices into purely organic and hybrid organic-inorganic sol-gel materials. Two main research themes on printable photonics are explored in parallel. The first concerns the development and testing of nanoimprint technologies to pursue the fabrication of progressively more challenging device concepts, from 2D to 3D. As a second research theme, the idea to couple top-down nano-patterning approaches (NIL) with bottom-up functionalities that emerge from engineering material proprieties at the chemistry level is put forward. To explore these research courses, two photonic devices were designed, fabricated and tested: an integrated holographic planar circuit for on-chip spectroscopy, and a photonic crystal slab printed out of a functional, high-refractive index material. The amount of integration, complexity and variety of the printed optical components presented here allow us to extend the validity of the work to an even broader range of photonic devices. This work advances the field of printable photonics and demonstrates its leverage to innovation, which encompasses several scientific fields.

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MAKHLOGA, ASHISH, and VIDESH KUMAR. "Sm3+ IONS DOPED BOROSILICATE GLASS FOR VISIBLE PHOTONIC DEVICE APPLICATIONS." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18625.

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An intense reddish-orange colour radiating Samarium doped Aluminium Calcium borosilicate (BSACS) glasses were synthesized with the help of the melt-quench method to analyze the photoluminescence properties using characterization methods like XRD, FT-IR, photoluminescence (PL) excitation, PL emission, and PL decay. XRD and FT-IR reveal the non-crystalline behavior along with the presence of numerous functional groups in BSACS host glass correspondingly. Under 402 nm excitation, three major peaks were found in the emission spectra which perfectly resembles to 4G5/2 → 6H5/2 (562 nm), 4G5/2 → 6H7/2 (599 nm), and 4G5/2 → 6H9/2 (646 nm) transitions of Samarium ions. 4G5/2 → 6H9/2 transition at 599 nm is comparatively more intense and noticeable. PL decay observed for 4G5/2 state reveals the exponential nature in which curves are fitted by using bi-exponential and tri- exponential fitting to assess the practically measured lifetimes (τexp). It is observed that the τexp values are decreasing with increasing Samarium ion concentration due to the cross-relaxation energy transference. All of the findings indicate that Sm3+ doped borosilicate glass is suitable for its usage in visible reddish orange photonic devices.

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Haigh, Paul. "Using equalizers to increase data rates in organic photonic devices for visible light communications systems." Thesis, Northumbria University, 2014. http://nrl.northumbria.ac.uk/21415/.

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This thesis proposes to marry two separate technologies together. The first technology is that of visible light communications (VLC), and the second is small molecule and polymer organic photonic devices. These two technologies both offer outstanding potential in their respective fields of information communications and optoelectronics, with both being proposed as two of the most important technologies about to emerge in the next decades by their respective research communities. As such, it is imperative to investigate and analyse the performance of organic photonic devices in the context of VLC broadcasting networks. There have been no experimental results in the literature reporting on organic-VLC systems until the work proposed in this thesis and therefore the focus is on improving transmission speeds.

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Pierre, Thomas. "Mesure de la température à l'échelle microscopique par voie optique dans la gamme ultraviolet-visible." Thesis, Vandoeuvre-les-Nancy, INPL, 2007. http://www.theses.fr/2007INPL096N/document.

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Cette étude porte sur la mesure de la température à l’échelle microscopique par voie optique dans la gamme UV-visible par comptage de photons à l’aide d’un PMT refroidi. À partir des avantages et des inconvénients de chaque technique existante, la première partie permet de comprendre les orientations de nos travaux. Le Second Chapitre montre et insiste sur l’intérêt de travailler aux courtes longueurs d’onde (limite de diffraction, précision sur la mesure...), d’utiliser la méthode multi-spectrale pour s’affranchir de paramètres inconnus (e.g. l’émissivité) en choisissant judicieusement les longueurs d’onde de travail, ainsi que les lois statistiques classiques pour mesurer le flux photonique sachant son émission aléatoire. Le Chapitre Trois présente le banc de mesure (microscope optique, système de mesure du flux photonique...) et une attention toute particulière est portée sur la conception des éléments chauffants servant à l’étalonnage. Le Quatrième Chapitre présente les résultats en températures obtenues à l’aide des lois statistiques. Ils valident le bon fonctionnement du dispositif, la mise au point de la zone microscopique, et l’intérêt de bien modéliser les filtres monochromatiques. Enfin, des améliorations sur la précision de la mesure (réseau de diffraction, analyseur multi-canal) et pour mesurer des températures plus faibles (LIF, méthode corrélation temporelle) sont présentées dans le Cinquième Chapitre
The aim of this study is to measure microscale temperature by optical way in the UV-visible range by photons counting using a cooled PMT. From the existing techniques advantages and disadvantages, this first part allows to understand the choices of this study. The second part shows and underlines the interest in working in short wavelengths (diffraction limit, measurement accuracy), in using the multi-spectral method to get rid of unknown parameters (e.g. emissivity) by choosing judicious working wavelengths, as well as the statistic laws to measure the photonic flux knowing its random emission. The third chapter presents the optical bench (optical microscope, photonic flux measurement facility…). A particularly attention is given to the design of the heated elements, which allow to calibrate the facility. The fourth part exposes the temperature results obtained through statistic laws. They validate the well-running of the facility, the microscopic area focusing, and the interest to model correctly the filters. Finally, measurement accuracy improvements (diffraction grating, multi-channel analyzer) and lower temperature measurement techniques (LIF, time-correlated method) are presented in the fifth part

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Gach, Jean-Luc. "Imageurs à amplification." Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0317.

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Анотація:

La quête du détecteur parfait, sans bruit, capable de détecter des photons uniques dans le visible et l’infrarouge, et ultimement de déterminer leur énergie est le graal de la détection. Pour arriver à ce but, de nombreux scientifiques ont développé des dispositifs depuis plusieurs dizaines d’années, et les astronomes ont toujours été à la pointe en ce domaine. En ce sens les imageurs à amplification semblent être la voie la plus rapide et la plus prometteuse pour atteindre ce but ultime. Ainsi après un bref historique de l’état de l’art sont exposés les systèmes à comptage de photons (IPCS) développés au LAM, qui ont été utilisés sur les télescopes ESO 3m60, OHP 1m93 ou encore WHT 4m20. Sont ensuite abordés les dispositifs imageurs intégrés à amplification comme les EMCCD (Electron multiplying charge coupled devices) dans le visible, avec quelques exemples de leur utilisation en astronomie. C’est la technologie qui, appliquée aux senseurs de front d’onde, aura permis conjointement à d’autres développements l’avènement des optiques adaptatives extrêmes comme celle de l’instrument VLT-SPHERE ou encore de SUBARU-SCExAO. Pour finir les e-APD (electron initiated avalanche photodiode) dans l’infrarouge seront abordés. Les e-APD ont cette propriété très intéressante d’être des amplificateurs quasi parfaits, et ont une capacité à détecter l’énergie des photons, des propriétés qui seront développées et analysées. Nous finirons par les perspectives et les progrès que nous sommes en droit d’attendre dans les prochaines années
The quest for the perfect, noiseless detector, capable of detecting unique photons in the visible and infrared, and ultimately determining their energy is the grail of detection. To achieve this goal, many scientists have developed devices for several decades, and astronomers have always been at the forefront in this area. In this sense amplification imagers seem to be the fastest and most promising way to achieve this ultimate goal. Thus, after a brief history of the state of the art are exposed the photon counting systems (IPCS) developed at LAM, which were used on ESO telescopes 3m60, OHP 1m93 or WHT 4m20. Imaging integrated imaging devices such as Electron Multiplying Charge Coupled Devices (EMCCDs) are then discussed in the visible, with some examples of their use in astronomy. It is the technology that, applied to the wavefront sensors, has jointly enabled other developments the advent of extreme adaptive optics such as the VLT-SPHERE or SUBARU-SCExAO. To finish the e-APD (electron-induced avalanche photodiode) in the infrared will be discussed. E-APDs have this very interesting property of being almost perfect amplifiers, and have an ability to detect photon energy, properties that will be developed and analyzed. We will end up with the prospects and the progress that we are entitled to expect in the coming years

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West, Gavin N. (Gavin Neal). "Visible and ultraviolet integrated photonics for addressing atomic systems." Thesis, Massachusetts Institute of Technology, 2019. https://hdl.handle.net/1721.1/122915.

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Анотація:

This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.
Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2019
Cataloged from student-submitted PDF version of thesis.
Includes bibliographical references (pages 117-129).
In the wake of many technological successes in integrated photonics based on silicon, attention has been given to applications in the visible light regime. This thesis is concerned with furthering the development of integrated photonics for controlling atomic systems, in particular individual trapped atomic ions. Nature places strict constraints on the frequency of the lasers used to address these atoms, typically spanning from the ultraviolet into the near infrared, and on the sensitivity to accidental perturbations from the control hardware. A platform for broadband integrated photonics, using amorphous aluminum oxide as the patterned material, is developed and exhibits suitable performance in the visible and ultraviolet. The waveguide loss and resonator quality factors are the best which have been reported to date, for wavelengths shorter than 500 nm. Next, a theory is developed which proposes laser frequency noise as a limiting factor for the extinction ratio of common integrated modulator designs. Understanding of this limit, and possible methods to suppress its effects, is important due to the fragile nature of single-photon-sensitive quantum systems. Finally, the application of technology developed here is applied to the analysis of trapped-ion-based optical atomic clocks. Justification for such integration of clocks and the impacts that result -- both good and bad -- are discussed from the perspective of a hardware designer.
by Gavin N. West.
S.M.
S.M. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science

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Choy, Jennifer Tze-Heng. "Nanophotonic Structures for Coupling to Quantum Emitters in the Visible." Thesis, Harvard University, 2013. http://dissertations.umi.com/gsas.harvard:10990.

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This thesis is about the design, fabrication, and characterization of nanophotonic elements in the visible that can enhance light-matter interaction for single quantum emitters. We focus on two material systems: single photon sources based on the nitrogen-vacancy (NV) center in diamond with improved spontaneous emission rates and collection efficiencies, and passive TiO2 devices that comprise a potentially broadband (from the visible to the infrared), low loss photonics platform and that are suitable for probing and manipulating single colloidal quantum dots. We first discuss the requirements for using color center emission in bulk diamond crystals for potential applications in quantum information processing, and provide examples of using nanowire structures and planar resonators made in diamond for engineering the the NV center’s pump and collection efficiencies, and spontaneous emission rates, respectively. We also describe the integration of diamond with plasmonic structures. We have designed and implemented diamond-silver apertures for broadband enhancements of the spontaneous emission rates of NV centers. We show that shallow-implanted NV centers in diamond nanoposts provide a good system for controlling the NV center spontaneous emission rates, allowing for quenched emission with long lifetimes in the bare case, and enhanced emission with fast decay rates (corresponding to a Purcell factor of around 6) when coated with silver. We add plasmonic gratings around the diamond-silver apertures to improve the collection efficiency of the system, and observe over two-fold improvement in collection. We demonstrate the fabrication of chip-scale linear optical elements such as waveguides and racetrack resonators in low-loss \(TiO_2\) thin films. The fabricated waveguides operate over a wide bandwidth with propagation losses from from 30 dB/cm in the visible to 4 dB/cm in the IR, while racetrack resonators can critically couple to waveg- uides and have quality factors as high as ~22000 in the red wavelengths. We present the fabrication of dielectric slot waveguides and their integration with colloidal quan- tum dots. Finally, we describe efforts to study and control charge transfer processes between quantum dots and \(TiO_2\) on a single emitter level.
Engineering and Applied Sciences

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Alsolami, Ibrahim. "Visible light communications with single-photon avalanche diodes." Thesis, University of Oxford, 2014. http://ora.ox.ac.uk/objects/uuid:744eeb47-8bb6-4776-8b8f-f7b6374d89bd.

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This thesis explores the use of single-photon avalanche diodes (SPADs) for visible light communications (VLC). The high sensitivity of SPADs can potentially enhance the performance of VLC receivers. However, a SPAD-based system has challenges that need to be addressed before it can be considered as a viable option for VLC. The first challenge is the susceptibility of SPAD-based receivers to variations in ambient light. The high sensitivity of SPADs is advantageous for signal detection, but also makes SPADs vulnerable to variations in ambient light. In this thesis, the performance of a SPAD-based receiver is investigated under changing lighting conditions. Analytical expressions to quantify performance are derived, and an experiment is conducted to gain further understanding of system performance. It is shown that a SPAD-based receiver is highly sensitive to illumination changes when on-off keying (OOK) is employed, and that pulse-position modulation (PPM) is a preferred modulation scheme as it is more robust. The second challenge is broadcasting to SPAD-based receivers with different capabilities. A traditional broadcasting scheme is time-sharing, whereby a transmitter sends data to receivers in an alternating manner. Broadcasting to SPAD-based receivers is challenging as receivers may have diverse capabilities. In this thesis, a new multiresolution modulation scheme is proposed, which can potentially improve system performance over the traditional timesharing approach. The performance of the proposed scheme is analyzed, and a proof-of-concept experiment is performed to demonstrate its viability.

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Bellocchi, Gabriele. "Visible light emission from Eu-containing Si-based materials." Doctoral thesis, Università di Catania, 2014. http://hdl.handle.net/10761/1519.

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Among the various rare earth ions, a particular attention is currently devoted to Eu, because of its peculiar chemical and optical properties. Indeed Eu is stable both in its trivalent and divalent oxidation state; Eu2+ ions are characterized by a very intense and broad emission band, tunable in all the visible range, which can be of interest for many technological fields, while Eu3+ ions present less intense and sharp emission peaks at arround 600 nm. In this thesis, two different approaches able to take advantage of the properties of Eu ions have been presented: i) the doping approach, which fully exploits the many advantages offered by a Si oxycarbide (SiOC) host matrix, and ii) the compound approach, which mainly focuses on Eu silicates. By centering the attention on host matrices compatible with Si technology, Eu-doped SiO2 is a widely studied system, but its perspectives are quite poor, since the low Eu solid solubility in SiO2 strongly limits the concentration of optically active Eu ions. On the other hand, it has been demonstrated in this thesis that a SiOC matrix is able to enhance the solubility of Eu ions by two orders of magnitude with respect to SiO2, and simultaneously acts as an efficient reducing ambient for Eu ions, which are indeed stabilized in their divalent oxidation state. As a result, Eu-doped SiOC shows a very strong room temperature PL emission in the visible range, which is more than two orders of magnitude more intense than that one of Eu-doped SiO2. Furthermore, the occurrence of an energy transfer mechanism between the SiOC matrix and Eu2+ ions increases the efficiency of photon absorption for excitation wavelengths shorter than 300 nm. Due to this properties Eu-doped SiOC offers great potentialities for the fabrication of light sources. In this thesis a continuous redshift of the emission peak from 400 to 600 nm by increasing the Eu concentration has been reported, allowing to consider this material a tunable light source. Furthermore, Eu2+ properties have been also used to realize a white light source, through the synthesis of a bilayer consisting of two SiOC films doped with different Eu concentrations. Through a proper choice of the annealing temperature, and taking advantage of the dependence of the PL peak position on the Eu concentration, an intense white emission at room temperature has been obtained. The CIE chromaticity coordinates of the emission are (0.33, 0.36), to be compared with those relative to an ideal white emission which are (0.33, 0.33), and the calculated color rendering index is 91/100. The second approach discussed in this thesis is based on the synthesis of Eu compounds by thermal processing of Eu2O3 thin films deposited by RF magnetron sputtering on Si substrates. It has been shown that annealing processes in N2 ambient lead to a complex reactivity at the Eu2O3/Si interface, which induces from Eu3+ to Eu2+ reduction and formation of stable Eu2+ silicates (Eu2SiO4 and EuSiO3). These materials show a very strong and broad room temperature emission peaked at 590 nm, with a very high external quantum efficiency arround 10%. This result is very impressive, especially if we consider previously reported data for Eu silicates grown with different methods, in which an external quantum efficiency of 0.1\% has been observed. The results shown in this thesis demonstrate that Eu-doped SiOC and Eu silicates have the potentialities for becoming the building blocks of future devices for lighting and photonics. The development of suitable strategies for obtaining an electrical excitation in both kind of materials, coupled with a full comprehension of the dependence of their optical properties and structural features on growth conditions and post-growth processing will be able to drive a complete transition of these materials from research laboratories to devices for every-day life.

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Книги з теми "VISIBLE PHOTONIC"

Loomis, Cole Merritt. Two-dimensional photonic bandgap materials in the visible: The study of silicon-based triangular PBG lattice characteristics. 2000.

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Loomis, Cole Merritt. Two-dimensional photonic bandgap materials in the visible: The study of silicon-based triangular PBG lattice characteristics. 2000.

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Developments in Detector Technologies Committee, Technology Insightâ¬"Gauge, Evaluate, and Review Standing Committee , National Research Council, and Division on Engineering and Physical Sciences. Seeing Photons: Progress and Limits of Visible and Infrared Sensor Arrays. National Academies Press, 2010.

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Standing Committee on Technology Insight?Gauge, Evaluate, and Review, Committee on Developments in Detector Technologies, National Research Council, and Division on Engineering and Physical Sciences. Seeing Photons: Progress and Limits of Visible and Infrared Sensor Arrays. National Academies Press, 2010.

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Seeing Photons Progress And Limits Of Visible And Infrared Sensor Arrays. National Academies Press, 2010.

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Levin, Frank S. The Hydrogen Atom and Its Colorful Photons. Oxford University Press, 2017. http://dx.doi.org/10.1093/oso/9780198808275.003.0010.

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The energies, kets and wave functions obtained from the Schrödinger equation for the hydrogen atom are examined in Chapter 9. Three quantum numbers are identified. The energies turn out to be the same as in the Bohr model, and an energy-level diagram appropriate to the quantum description is constructed. Graphs of the probability distributions are interpreted as the electron being in a “cloud” around the proton, rather than at a fixed position: the atom is fuzzy, not sharp-edged. The wavelengths of the five photons of the Balmer series are shown to be in the visible range. These photons are emitted when electrons transition from higher-excited states to the second lowest one, which means that electronic-type transitions underlie the presence of colors in our visible environment. The non-collapse of the atom, required by classical physics, is shown to arise from the structure of Schrödinger’s equation.

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Частини книг з теми "VISIBLE PHOTONIC"

Hoeher, Peter Adam. "Photonic Devices and High-Speed Amplifiers." In Visible Light Communications, 50–57. München: Carl Hanser Verlag GmbH & Co. KG, 2019. http://dx.doi.org/10.3139/9783446463035.008.

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Hoeher, Peter Adam. "Photonic Devices and High-Speed Amplifiers." In Visible Light Communications, 183–206. München: Carl Hanser Verlag GmbH & Co. KG, 2019. http://dx.doi.org/10.3139/9783446461727.008.

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Willebrand, H., Y. Astrov, L. Portsel, S. Teperick, T. Gauselmann, and H. G. Purwins. "An IR-Visible Converter for Spatially and Temporally Resolved IR-Image Detection." In Applications of Photonic Technology, 449–52. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4757-9247-8_84.

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Liu, Y. P., Y. P. Guo, Z. J. Yan, C. M. Huang, and Y. Y. Wang. "Modulation of Three Dimensional Photonic Band Gap in Visible Region." In Semiconductor Photonics: Nano-Structured Materials and Devices, 20–22. Stafa: Trans Tech Publications Ltd., 2007. http://dx.doi.org/10.4028/0-87849-471-5.20.

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Ruda, Harry, and Naomi Matsuura. "Nano-Engineered Tunable Photonic Crystals in the Near-IR and Visible Electromagnetic Spectrum." In Springer Handbook of Electronic and Photonic Materials, 997–1019. Boston, MA: Springer US, 2006. http://dx.doi.org/10.1007/978-0-387-29185-7_41.

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Sotomayor Torres, C. M., T. Maka, S. G. Romanov, Manfred Müller, and Rudolf Zentel. "Dielectric-Polymer Nanocomposite and Thin Film Photonic Crystals: Towards Three-Dimensional Photonic Crystals with a Bandgap in the Visible Spectrum." In Frontiers of Nano-Optoelectronic Systems, 23–39. Dordrecht: Springer Netherlands, 2000. http://dx.doi.org/10.1007/978-94-010-0890-7_3.

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Bléger, David, and Stefan Hecht. "Strategies for Switching with Visible Light." In Photon-Working Switches, 93–114. Tokyo: Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-56544-4_4.

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Fukaminato, Tuyoshi, and Masahiro Irie. "Diarylethenes that Photoswitch with Visible Light." In Photon-Working Switches, 169–80. Tokyo: Springer Japan, 2017. http://dx.doi.org/10.1007/978-4-431-56544-4_8.

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Beckwith, Steven V. W. "The visible and near-infrared domain." In Observing Photons in Space, 121–37. New York, NY: Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-7804-1_6.

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Kim, Jungsang, Seema Somani, and Yoshihisa Yamamoto. "Single-Photon Detection with Visible-Light Photon Counter." In Nonclassical Light from Semiconductor Lasers and LEDs, 179–205. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/978-3-642-56814-5_12.

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Тези доповідей конференцій з теми "VISIBLE PHOTONIC"

Vandervlugt, Corrie, Nathan Hagen, Robert Sampson, Eustace Dereniak, and Grant Gerhart. "Visible imaging spectro-polarimeter." In Photonic Devices + Applications, edited by Sylvia S. Shen and Paul E. Lewis. SPIE, 2007. http://dx.doi.org/10.1117/12.734242.

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Zhang, Zhaoyu, Tomoyuki Yoshie, Xiaoliang Zhu, Jiajing Xu, and Axel Scherer. "Visible Planar Photonic Crystal Laser." In Frontiers in Optics. Washington, D.C.: OSA, 2006. http://dx.doi.org/10.1364/fio.2006.ftui5.

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Zhou, Jie, Taojie Zhou, Jiagen Li, Kebo He, and Zhaoyu Zhang. "Flexible visible photonic crystal laser." In 2017 Conference on Lasers and Electro-Optics Europe (CLEO/Europe) & European Quantum Electronics Conference (EQEC). IEEE, 2017. http://dx.doi.org/10.1109/cleoe-eqec.2017.8086363.

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YAMAZATO, Takaya. "Visible Light Beacon." In Signal Processing in Photonic Communications. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/sppcom.2020.spm4i.4.

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Tyndall, Nathan F., Marcel W. Pruessner, Nicholas M. Fahrenkopf, Alin Antohe, and Todd H. Stievater. "A Visible-Light Foundry Platform from AIM Photonics." In Optical Fiber Communication Conference. Washington, D.C.: Optica Publishing Group, 2023. http://dx.doi.org/10.1364/ofc.2023.w3b.4.

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We report on a new the nitride-only photonic integrated circuit platform at AIM Photonics optimized for visible and near-infrared wavelengths (500 nm to 1000 nm). Waveguide propagation loss, passive component performance, and sensing are discussed.

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Zhou, Jie, Taojie Zhou, Jiagen Li, Kebo He, and Zhaoyu Zhang. "Flexible Visible Photonic Crystal Laser Cavity." In Advanced Solid State Lasers. Washington, D.C.: OSA, 2017. http://dx.doi.org/10.1364/assl.2017.jm5a.22.

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Zhaoyu Zhang, Tomoyuki Yoshie, Victor Liu, Ting Hong, and Axel Scherer. "Visible 2-dimentional photonic crystal laser." In 2007 Quantum Electronics and Laser Science Conference. IEEE, 2007. http://dx.doi.org/10.1109/qels.2007.4431026.

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Zhang, Zhaoyu, Tomoyuki Yoshie, Victor Liu, Ting Hong, and Axel Scherer. "Visible 2-dimentional Photonic Crystal Laser." In CLEO 2007. IEEE, 2007. http://dx.doi.org/10.1109/cleo.2007.4453249.

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Zhou, Jie, Taojie Zhou, Jiagen Li, Kebo He, and Zhaoyu Zhang. "Flexible visible photonic crystal laser cavity." In 2017 IEEE Photonics Conference (IPC). IEEE, 2017. http://dx.doi.org/10.1109/ipcon.2017.8116256.

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Ko, C., K. Lee, and S. Chi. "Visible photonic switch based on tunable 2D ferromagnetic photonic crystal." In INTERMAG 2006 - IEEE International Magnetics Conference. IEEE, 2006. http://dx.doi.org/10.1109/intmag.2006.375798.

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Звіти організацій з теми "VISIBLE PHOTONIC"

McIlroy, David. Two-Dimensional Photonic Crystals for Near IR and Visible Optoelectronics Applications. Fort Belvoir, VA: Defense Technical Information Center, January 2005. http://dx.doi.org/10.21236/ada430192.

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Fischer, Arthur Joseph, Ganapathi S. Subramania, Anthony J. Coley, Yun-Ju Lee, Qiming Li, George T. Wang, Ting Shan Luk, Daniel David Koleske, and Kristine Wanta Fullmer. Final LDRD report : enhanced spontaneous emission rate in visible III-nitride LEDs using 3D photonic crystal cavities. Office of Scientific and Technical Information (OSTI), September 2009. http://dx.doi.org/10.2172/993884.

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Letcher, Theodore, Julie Parno, Zoe Courville, Lauren Farnsworth, and Jason Olivier. A generalized photon-tracking approach to simulate spectral snow albedo and transmittance using X-ray microtomography and geometric optics. Engineer Research and Development Center (U.S.), June 2023. http://dx.doi.org/10.21079/11681/47122.

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A majority of snow radiative transfer models (RTMs) treat snow as a collection of idealized grains rather than an organized ice–air matrix. Here we present a generalized multi-layer photon-tracking RTM that simulates light reflectance and transmittance of snow based on X-ray micro- tomography images, treating snow as a coherent 3D structure rather than a collection of grains. The model uses a blended approach to expand ray-tracing techniques applied to sub-1 cm3 snow samples to snowpacks of arbitrary depths. While this framework has many potential applications, this study’s effort is focused on simulating reflectance and transmittance in the visible and near infrared (NIR) through thin snow- packs as this is relevant for surface energy balance and remote sensing applications. We demonstrate that this framework fits well within the context of previous work and capably reproduces many known optical properties of a snow surface, including the dependence of spectral reflectance on the snow specific surface area and incident zenith angle as well as the surface bidirectional reflectance distribution function (BRDF). To evaluate the model, we compare it against reflectance data collected with a spectroradiometer at a field site in east-central Vermont. In this experiment, painted panels were inserted at various depths beneath the snow to emulate thin snow. The model compares remarkably well against the reflectance measured with a spectroradiometer, with an average RMSE of 0.03 in the 400–1600 nm range. Sensitivity simulations using this model indicate that snow transmittance is greatest in the visible wavelengths, limiting light penetration to the top 6 cm of the snowpack for fine-grain snow but increasing to 12 cm for coarse-grain snow. These results suggest that the 5% transmission depth in snow can vary by over 6 cm according to the snow type.

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