A5057256847- Photonic and Optical Devices
- Photorefractive and Nonlinear Optics
- Semiconductor Lasers and Optical Devices
- solar cell performance optimization
- Optical Coatings and Gratings
- Advanced Optical Imaging Technologies
- Photovoltaic System Optimization Techniques
- Advanced Fiber Optic Sensors
- Liquid Crystal Research Advancements
- Optical Network Technologies
- Optical Coherence Tomography Applications
- Solar Thermal and Photovoltaic Systems
- Photonic Crystals and Applications
- Digital Holography and Microscopy
- Advanced optical system design
- Advanced Fiber Laser Technologies
- Adaptive optics and wavefront sensing
- Thin-Film Transistor Technologies
- Thermal Radiation and Cooling Technologies
- Phase-change materials and chalcogenides
- Advanced Optical Network Technologies
- Silicon and Solar Cell Technologies
- Magneto-Optical Properties and Applications
- Optical and Acousto-Optic Technologies
- Advanced Fluorescence Microscopy Techniques
University of Arizona
2014-2023
Amazon (United States)
2023
Eindhoven University of Technology
2023
Optical Sciences (United States)
1994-2014
Massachusetts Institute of Technology
2008
International Society for Optics and Photonics
2008
Stanford University
1985-1987
United States Coast Guard
1981
Single-axis tracking is a cost-effective deployment strategy for large-scale ground-mount photovoltaic systems in regions with high direct-normal irradiance. Bifacial modules 1-axis-tracking boost energy yield by 4%-15% depending on module type and ground albedo, global average of 9%. This benefit addition to the 15%-25% gain already afforded single-axis relative fixed-tilt deployments. Here, we compare model results against field performance data two side-by-side bifacial/monofacial tracked...
Models predicting rear irradiance for bifacial systems are critical to establish accurate estimates of energy yield. Here, we compare five published models, varying clearance, row spacing, tilt, and albedo measure the sensitivity these parameters. Bifacial gains (BGE) as high 20% predicted some configurations. Model agreement is generally good low ground clearance (clearance heights lower than 0.75 times collector width), but at higher clearances, finite system size edge effects become a...
Contents1. Materials for dynamic holographic 3D display 2. Photopolymerizable nanocomposite materials applications 3. Photopolymers the recording of waveguides 4. Shrinkage in materials: photopolymers 5. Advances photorefractive and devices 6. Industrial-scale material mass production vHOEs 7. Non-imaging optics solar energy conversion 8. Data security data storage 9. Multimodal acquisition using digital holography 10.EUV SXR tomography with compact short wavelength sources 11.Holographic...
An imaging system is proposed as an alternative to metallized connections between integrated circuits. Power requirements for interconnects and electrooptic links are compared. A holographic optical element considered the device. Several experimental systems have been constructed which visible LEDs transmitters PIN photodiodes receivers. Signals evaluated at different source–detector separations. Multiple exposure holograms used a means of fan out allowing one source simultaneously address...
A formalism is presented for calculating the ordinary and extraordinary refractive indices a uniaxial film with optical properties equivalent to those of conically mounted zeroth-order lamellar grating. In quasi-static limit (grating-period-to-wavelength ratio → 0) this treatment exact both dielectric metallic gratings. For period-to-wavelength ratios approaching unity, effective anisotropic are dependent on polar azimuthal incidence angles. The validity method as increases studied by...
We evaluate the effect of finite aperture gratings on spectral and efficiency characteristics guided-mode resonance filters. A simple analytical model based attenuation properties waveguide a fixed length grating is developed. The results from this are in good agreement with experimental filters formed subwavelength period photoresist solgel waveguides.
A forward-error correction (FEC) scheme based on low-density parity check (LDPC) codes and iterative decoding using belief propagation in code graphs is presented this paper. We show that LDPC provide a significant system performance improvement with respect to the state-of-the-art FEC schemes employed optical communications systems. present class of structured mutually orthogonal Latin rectangles. Such have high rates can lend themselves very low-complexity encoder/decoder implementations....
Holographic gratings formed in thick phenanthrenquinone- (PQ-) doped poly(methyl methacrylate) (PMMA) can be made to have narrowband spectral and spatial transmittance filtering properties. We present the design performance of angle-multiplexed holographic filters PQ-PMMA at 488 nm reconstructed with a LED operated ~630 nm. The dark delay time between exposure preillumination polymer prior area are varied optimize diffraction efficiency multiplexed filters. resultant enhance four-dimensional...
We analyze the energy collection properties of holographic planar concentrator systems. The effects solar variation on daily and annual are evaluated. Hologram diffraction efficiency, polarization, crosstalk in cascaded elements, constraints imposed by radiance theorem, as well illumination characteristics, considered. A configuration is designed modeled to maximize efficiency during course a year without need for tracking. Results indicated that nearly 50% available illuminating hologram...
This report provides a snapshot of emerging photovoltaic (PV) technologies. It consists concise contributions from experts in wide range fields including silicon, thin film, III-V, perovskite, organic, and dye-sensitized PVs. Strategies for exceeding the detailed balance limit light managing are presented, followed by section detailing key applications commercialization pathways. A on sustainability then discusses need minimization environmental footprint PV manufacturing recycling. The...
The polarization properties of cascaded substrate-mode holographic optical elements are analyzed and demonstrated. design criteria for selective nonselective given verified with experimental volume holograms formed in dichromated gelatin emulsions. Using the grating parameters, it is estimated that a reconfigurable bus eight nodes can be made. Improved control hologram construction parameters increase this to more than 500 nodes. Use device interchange coupler multistage also examined.
The geometrical design characteristics of multiple-image holograms are evaluated. A figure merit expressing these as a function the hologram diameter and distance between image plane is developed. This value then used to compare two designs which capable forming several hundred interconnections. results indicate that connections can be formed points on substrate separated by 2–3 cm provided from 0.5–1 cm. Each experimentally demonstrated in bleached photographic emulsions.
During the past few years there has been a significant interest in spectrum splitting systems to increase overall efficiency of photovoltaic solar energy systems. However, methods for comparing performance and effects optical spectral filter design on system are not well developed. This paper addresses these two areas. The conversion is examined detail role filters with respect A new metric termed Improvement over Best Bandgap defined which expresses gain similar that contains highest...
We discuss the use of holographic photopolymer materials for as dense wavelength division multiplexing filters in C-band optical communication spectrum. An edge-illuminated hologram configuration is described that effectively extends grating length to achieve narrow band operating near 1550 nm photopolymers are 100-200-microm thick. This enables formation apodized and cascaded filter systems. Rouard's method used examine properties both apodization gratings indicates potential spectral...
The alignment and chromatic sensitivity of holographic optical elements for use in interconnect systems are quantified. effects these image degrading parameters related to the frequency power requirements CMOS compatible detectors an system. Techniques reducing magnitude problems with substrate-mode holograms described, experimental results demonstrating designs presented.
The diffraction and the dispersion properties of holographic optical elements are examined for use as solar concentrators photovoltaic hybrid photovoltaic/thermal energy conversion systems. angle efficiency computed folded geometries that potentially useful low concentration ratio systems can reduce cost residential An investigation collection a planar concentrator spectrum splitting analyzed with different construction parameters. It is found angles 40<sup>o</sup> spectral bandwidth 70 nm...
A three-dimensional imaging system incorporating multiplexed holographic gratings to visualize fluorescence tissue structures is presented. Holographic formed in volume recording materials such as a phenanthrenquinone poly(methyl methacrylate) photopolymer have narrowband angular and spectral transmittance filtering properties that enable obtaining spatial-spectral information within an object. We demonstrate this system's ability obtain multiple depth-resolved images simultaneously.
This paper describes a high-efficiency, spectrum-splitting photovoltaic module that uses an off-axis volume holographic lens to focus and disperse incident solar illumination rectangular shaped high-bandgap indium gallium phosphide cell surrounded by strips of silicon cells. The design allows efficient collection both direct diffuse maximize energy yield. We modeled the diffraction characteristics using rigorous coupled-wave analysis, simulated system performance nonsequential ray tracing PV...
Holographic imaging filters are required to have high Bragg selectivity, namely, narrow angular and spectral bandwidth, obtain spatial-spectral information within a three-dimensional object. In this Letter, we present the design of holographic formed using silicon oxide nanoparticles (nano-SiO2) in phenanthrenquinone-poly(methyl methacrylate) (PQ-PMMA) polymer recording material. This combination offers greater selectivity increases diffraction efficiency filters. The with optimized ratio...
A holographic module is designed to split light into two spectral bands for hybrid solar energy conversion. Incoming either transmitted a large subsystem receiver or diffracted through an aperture in this toward second receiver. The element simulated using rigorous diffraction and ray-tracing methods. Two applications of the design are described simulated. photovoltaic/thermal system with 93% optical efficiency adjustable power output ratio address intermittency provide storage. photovoltaic...
Abstract High spatial frequency lamellar gratings are shown to function as phase compensators, quarter-wave and half-wave retarders, polarization rotators that operate on specularly reflected (zeroth-order) beams. These designed using rigorous coupled-wave modal grating diffraction theories. Controlling the geometrical parameters of these allows for engineering retardation conversion introduced a beam. Fabrication operational tolerances elements discussed. Wavelength polar angle incidence...
At high bit rates, four-wave mixing and nonlinearities in the optical channel give rise to ghost pulses. In this letter, we propose application of modulation codes tackle effect.
In this paper we investigate the use of holographic filters in solar spectrum splitting applications. Photovoltaic (PV) systems utilizing have higher theoretical conversion efficiency than single bandgap cell modules. Dichroic band-rejection been used for applications with some success however these are limited to spectral control at fixed reflection angles. Reflection fabricated by recording interference pattern two coherent beams arbitrary construction This feature can be angles over which...
The optical efficiency of a holographic spectrum-splitting system with transmission lenses is investigated. Spectrum-splitting promising approach to improve the photovoltaic (PV) systems. By removing lattice-matching constraints, it possible utilize low-cost thin-film PV materials and fabrication techniques. Transmission holograms are fabricated recording interference patterns two or more coherent beams. It also use converging construction wavefronts record gratings that matched focusing...