Outdoor measurements of a photovoltaic system using diffractive spectrum-splitting and concentration

Mohammad, Nabil; Schulz, M.; Wang, P.; Menon, Rajesh

doi:10.1063/1.4963198

Cited by 6 publications

(5 citation statements)

References 30 publications

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“…Broadband diffractive optical elements using multi-level super-wavelength features have been applied for spectrum-splitting and concentration in photovoltaics 19 – 21 , and for super-achromatic cylindrical lenses 22 . In this work, we extend the application of this concept to broadband computer-generated holography by designing, fabricating and characterizing a variety of holograms.…”

Section: Introductionmentioning

confidence: 99%

Full-color, large area, transmissive holograms enabled by multi-level diffractive optics

Mohammad

Meem

Wan

et al. 2017

Sci Rep

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We show that multi-level diffractive microstructures can enable broadband, on-axis transmissive holograms that can project complex full-color images, which are invariant to viewing angle. Compared to alternatives like metaholograms, diffractive holograms utilize much larger minimum features (>10 µm), much smaller aspect ratios (<0.2) and thereby, can be fabricated in a single lithography step over relatively large areas (>30 mm ×30 mm). We designed, fabricated and characterized holograms that encode various full-color images. Our devices demonstrate absolute transmission efficiencies of >86% across the visible spectrum from 405 nm to 633 nm (peak value of about 92%), and excellent color fidelity. Furthermore, these devices do not exhibit polarization dependence. Finally, we emphasize that our devices exhibit negligible absorption and are phase-only holograms with high diffraction efficiency.

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Section: Introductionmentioning

confidence: 99%

Full-color, large area, transmissive holograms enabled by multi-level diffractive optics

Mohammad

Meem

Wan

et al. 2017

Sci Rep

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“…16 We further emphasize that we previously demonstrated water-immersion diffractive lenses with numerical aperture (NA) as high as 1.43. 17 Previously, we utilized the concept of broadband diffractive optics to design broadband holograms 18 and to demonstrate broadband spectrum splitting and concentration, 19,20 phase masks for 3D lithography 21 and cylindrical lenses with super-achromatic performance over the entire visible band. 22 Here, we design, fabricate and characterize broadband diffractive optics as planar lenses for imaging.…”

mentioning

confidence: 99%

Broadband imaging with one planar diffractive lens

Mohammad

Meem

Shen

et al. 2018

Sci Rep

120

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We demonstrate imaging over the visible band using a single planar diffractive lens. This is enabled via multi-level diffractive optics that is designed to focus over a broad wavelength range, which we refer to as an achromatic diffractive lens (ADL). We designed, fabricated and characterized two ADLs with numerical apertures of 0.05 and 0.18. Diffraction-limited focusing is demonstrated for the NA = 0.05 lens with measured focusing efficiency of over 40% across the entire visible spectrum (450 nm to 750 nm). We characterized the lenses with a monochromatic and a color CMOS sensor, and demonstrated video imaging under natural sunlight and other broadband illumination conditions. We use rigorous electromagnetic simulations to emphasize that ADLs can achieve high NA (0.9) and large operating bandwidth (300 nm in the visible spectrum), a combination of metrics that have so far eluded other flat-lens technologies such as metalenses. These planar diffractive lenses can be cost-effectively manufactured over large areas and thereby, can enable the wide adoption of flat, low-cost lenses for a variety of imaging applications.

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“…With the presented hybrid approach, we spectrally split and spatially concentrate light using a SpliCon that provides up to a 41.1% increase in SOE efficiency. Thank to the hybrid approach we reached an excess light intensity that helps in order to reduce our energy demand after harvesting much more solar energy with a DOE/SpliCon [16][17][18]. Our hybrid design approach may enable one to improve spectral resolution of optical spectrometers including a DOE/SpliCon designed for high spectral splitting within a short design duration.…”

Section: Discussionmentioning

confidence: 99%

“…The increased resolution requirement in designing a phase plate also increases the number of parameters to be optimized for an efficient control on light. A diffractive optical element (DOE) is a special type of phase plate that modulates light by using diffraction and interference with preferably minimal light scattering [15][16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

“…Solar energy can be more effectively converted to electricity using smart design schemes. Laterally arranged solar cells that are made from two different materials, produce increased energy output by enhancing spectral overlap between the absorption spectra of solar cells and the incident spectrum of the sunlight [15][16][17][18][19]. A DOE can spectrally disperse the sunlight and steer individual spectral band to the relevant target solar cell.…”

Section: Introductionmentioning

confidence: 99%

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Hybrid design of spectral splitters and concentrators of light for solar cells using iterative search and neural networks

Yolalmaz,

Yüce

2021

Preprint

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The need for optically multi-functional micro-and nano-structures is growing in various fields. Designing such structures is impeded by the lack of computationally low-cost algorithms. In this study, we present a hybrid design scheme, which relies on a deep learning model and the local search optimization algorithm, to optimize a diffractive optical element that performs spectral splitting and spatial concentration of broadband light for solar cells. Using generated data set during optimization of a diffractive optical element, which is a one-time effort, we design topography of diffractive optical elements by using a deep learning-based inverse design scheme. We show that further iterative optimization of the reconstructed diffractive optical elements increases amount of spatially concentrated and spectrally split light. Our joint design approach both speeds up optimization of diffractive optical elements as well as providing better performance at least 57% excess light concentration with spectral splitting. The algorithm that we develop here will enable advanced and efficient design of multi-functional phase plates in various fields besides the application that we target in solar energy. The algorithm that we develop is openly available to contribute to other applications that rely on phase plates.

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Outdoor measurements of a photovoltaic system using diffractive spectrum-splitting and concentration

Cited by 6 publications

References 30 publications

Full-color, large area, transmissive holograms enabled by multi-level diffractive optics

Full-color, large area, transmissive holograms enabled by multi-level diffractive optics

Broadband imaging with one planar diffractive lens

Hybrid design of spectral splitters and concentrators of light for solar cells using iterative search and neural networks

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