Analysis of diffraction efficiency of phase gratings in dependence of duty cycle and depth

Meshalkin, A.; Подлипнов, В. В.; Ustinov, Andrey V.; Achimova, E.

doi:10.1088/1742-6596/1368/2/022047

Cited by 24 publications

(16 citation statements)

References 18 publications

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“…If the grating height h and duty cycle D are then chosen such that the zero diffraction order cancels out, light will be transmitted only at odd diffraction orders. So, the phase difference φ = 2π/λ 0 * h * n of the interfering waves must be equal to π and D = 50% [50,51], implicating h = λ 0 /(2• n) ≈ 130 nm for an index contrast of n = n Si − n ARC = 2.29 at λ 0 = 600 nm. We note that these preliminary estimates are remarkably close to the outcome of the intensive FDTD computations performed in this work.…”

Section: A Real-space Considerationsmentioning

confidence: 99%

Light trapping in solar cells: simple design rules to maximize absorption

Haque

Martins

et al. 2020

Optica

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Solar cells can strongly benefit from optical strategies capable of providing the desired broadband absorption of sunlight and consequent high conversion efficiency. While many diffractive light-trapping structures prove high absorption enhancements, their industrial application rather depends on simplicity concerning the integration to the solar cell concept and the process technology. Here, we show how simple grating lines can perform as well as advanced light-trapping designs. We use a shallow and periodic grating as the basic element of a quasi-random structure, which is highly suitable for industrial mass production. Its checkerboard arrangement breaks the mirror symmetry and is shown, for instance, to enhance the bulk current of a 1 µm slab of crystalline silicon by 125%. We explain its excellent performance by drawing a direct link between a structure's Fourier series and the implied photocurrent, derived from a large and diverse set of structures. Our design rule thus meets all relevant aspects of light-trapping for solar cells, clearing the way for simple, practical, and yet outstanding diffractive structures, with a potential impact beyond photonic applications. Published by The Optical Society under the terms of the Creative Commons Attribution 4.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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Section: A Real-space Considerationsmentioning

confidence: 99%

Light trapping in solar cells: simple design rules to maximize absorption

Haque

Martins

et al. 2020

Optica

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“…In the present study we have focused on a duty cycle of 1/2 for the initial binary phase modulation. Other values of this factor could provide another degree of freedom to be explored 19 …”

Section: Discussionmentioning

confidence: 99%

“…Simple guidelines are available for a single cell (i.e. one period), giving the complex spectral envelope of the following form: 19,20

s ((), f) = T_{0} sinc ((), \frac{π T_{0}}{2} f) \cos ((), \frac{π T_{0}}{2} f + \frac{normalΔ φ}{2})

…”

Section: Ideal Binary Phase Modulationmentioning

confidence: 99%

“…the spectral components are spaced by twice the frequency of the initial modulation. The amplitude of the n th component is given by ( n > 0) 19 :

s ((), ((), 2 n - 1) f_{0}) = - \frac{2}{π} \frac{2}{2 n - 1} \sin ((), \frac{Δ φ}{2}) .

…”

Section: Ideal Binary Phase Modulationmentioning

confidence: 99%

“…In this context and given the link that can be drawn between the temporal and spatial domains, 11,12 we can benefit from the knowledge gained in the field of diffractive optics where binary phase gratings have been the subject of many discussions. [13][14][15] We consider here a fully coherent continuous wave which is phase modulated by an ideal profile φ(t) that is periodic (with a period T0, leading to a frequency f0 = 1/T0) and infinite. Such a profile is plotted in Fig.…”

Section: Initial Phase Ideal Phase Modulationmentioning

confidence: 99%

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Ultrashort pulse generation from binary temporal phase modulation

Sheveleva

Finot

2021

Micro & Optical Tech Letters

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We propose and numerically validate an all‐optical scheme to generate a train of optical pulses. Modulation of a continuous wave with a periodic binary temporal phase pattern followed by a spectral phase shaping enables us to obtain ultrashort pulse trains. An ideal step phase profile as well as a profile arisen from a bandwidth‐limited device is investigated. Analytical guidelines describing pulse train formation and their characteristics are provided. Pulses with a duration of a few picoseconds at a repetition rate of 10 GHz can be expected for realistic experimental conditions.

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3D Measurements and Characterizations of Refractive Index Distributions of Volume Holographic Gratings Using Low‐Coherence Holotomography

Jo,

Baek,

Hugonnet

et al. 2024

Advanced Optical Materials

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Holographic Optical Elements (HOEs) employ refractive index (RI) modulation to manipulate light, establishing their widespread application in augmented and virtual reality technologies. Despite significant strides in HOEs' fabrication, a comprehensive 3D examination and measurement of these elements remain largely unexplored. This study targets this void by conducting an in‐depth exploration of the 3D RI distributions of volume holographic gratings (VHGs), a quintessential representative of HOEs. Direct tomographic measurements of the 3D RI distributions within millimeter‐scale VHGs are performed at a spatial resolution of 156 nm × 156 nm × 1.2 µm and an RI precision of 2×10−4. This level of precision facilitates a systematic high‐resolution characterization of VHGs. The findings present a substantial evolution from traditional measurement techniques and promise to considerably advance the evaluation of intricate HOE structures and refine the corresponding fabrication processes.

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Analysis of diffraction efficiency of phase gratings in dependence of duty cycle and depth

Cited by 24 publications

References 18 publications

Light trapping in solar cells: simple design rules to maximize absorption

Light trapping in solar cells: simple design rules to maximize absorption

Ultrashort pulse generation from binary temporal phase modulation

3D Measurements and Characterizations of Refractive Index Distributions of Volume Holographic Gratings Using Low‐Coherence Holotomography

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