Journal ArticleDOI
Diffraction analysis of dielectric surface-relief gratings
M. G. Moharam,Thomas K. Gaylord +1 more
TLDR
In this article, a dielectric surface-relief grating is analyzed using rigorous coupled-wave theory and the analysis applies to arbitrary grating profiles, groove depths, angles of incidence, and wavelengths.Abstract:
Diffraction by a dielectric surface-relief grating is analyzed using rigorous coupled-wave theory. The analysis applies to arbitrary grating profiles, groove depths, angles of incidence, and wavelengths. Example results for a wide range of groove depths are presented for sinusoidal, square-wave, triangular, and sawtooth gratings. Diffraction efficiencies obtained from the present method of analysis are compared with previously published numerical results. To obtain large diffraction efficiencies (greater than 85%) for gratings with typical substrate permittivities, it is shown that the grating profile should possess even symmetry.read more
Citations
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Rectangular surface-relief transmission gratings with a very large first-order diffraction efficiency (∼95%) for unpolarized light
TL;DR: Computer optimization shows that the first-order diffraction efficiency of a lossless-transmission surface-relief grating with a rectangular surface profile can be made very large simultaneously for light of TE and TM polarizations incident near the Bragg angle by the proper choice of the fill factor.
Journal ArticleDOI
Efficiency analysis of diffractive lenses.
TL;DR: It is shown that for many practical cases the diffraction efficiency can be determined by only a single parameter that takes into account the spatial bandwidth product as well as the focal length of the lens and the illumination wavelength.
Journal ArticleDOI
Analyzing poly(3-hexyl-thiophene):1-(3-methoxy-carbonyl)propyl-1-phenyl-(6,6)C61 bulk-heterojunction solar cells by UV-visible spectroscopy and optical simulations
Kristian O. Sylvester-Hvid,Tobias Ziegler,Moritz Riede,Nicholas Keegan,Michael Niggemann,Andreas Gombert +5 more
TL;DR: In this paper, a non-destructive method for assessing the thickness of the photoactive layer in poly(3hexyl-thiophene):1-(3methoxy-carbonyl)propyl-1-phenyl-(6,6)C61 (P3HT:PCBM) solar cells is reported.
Journal ArticleDOI
Designing optimized nano textures for thin-film silicon solar cells
TL;DR: An approximate very fast algorithm is presented that allows optimizing the surface morphology of two-dimensional nano-textured interfaces of TFSSC by combining a recently developed scattering model based on the scalar scattering theory, the Perlin-noise algorithm, and the simulated annealing algorithm as optimization tool.
Journal ArticleDOI
Femtosecond laser fabrication of LIPSS-based waveplates on metallic surfaces
A. San-Blas,A. San-Blas,Miguel Martinez-Calderon,Miguel Martinez-Calderon,Jeronimo Buencuerpo,Luis Miguel Sanchez-Brea,J. del Hoyo,M. Gómez-Aranzadi,M. Gómez-Aranzadi,Ainara Rodriguez,Ainara Rodriguez,Santiago M. Olaizola,Santiago M. Olaizola +12 more
TL;DR: A fast and reliable method for the fabrication of polarization modifying devices using femtosecond laser is reported in this paper, where a setup based on line focusing is used for the generation of LIPSS on stainless steel, processing at different speeds between 0.8 and 2.4mm/s with constant energy per pulse of 1.4mJ.
References
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Journal ArticleDOI
Rigorous coupled-wave analysis of planar-grating diffraction
M. G. Moharam,Thomas K. Gaylord +1 more
TL;DR: In this article, a rigorous coupled-wave approach is used to analyze diffraction by general planar gratings bounded by two different media, and the analysis is based on a state-variables representation and results in a unifying, easily computer-implementable matrix formulation.
Journal ArticleDOI
Theory of Periodic Dielect Waveguides
TL;DR: In this paper, the propagation of electromagnetic waves along open periodic, dielectric waveguides is formulated as a rigorous and exact boundary-value problem, and the characteristic field solutions are shown to be of the surface-wave or leaky-wave type, depending on the ratio of periodicity to wavelength (d/lambda).
Journal ArticleDOI
Analysis and Design of Grating Couplers
Theodor Tamir,S. T. Peng +1 more
TL;DR: In this paper, simple design criteria for grating couplers which transfer the energy of a beam into or out of an optical waveguide are developed based on an accurate perturbation analysis of the guiding properties of dielectric gratings.
Journal ArticleDOI
Rigorous diffraction theory for transmission phase gratings with deep rectangular grooves
TL;DR: In this article, the diffraction of light by deep rectangular-groove transmission phase gratings is treated by solving Maxwell's equations numerically, and results are given for the light diffracted into the zero order by gratings with grating constants d in the range λ < d < 5λ, aspect ratio b (= linewidth/d), 0 < b < 1, and grating depths a < 5 λ, assuming a refractive index n 0 = 1.
Journal ArticleDOI
Analysis of grating-coupled radiation in GaAs:GaAlAs lasers and waveguides - I
TL;DR: In this paper, a general formulation for arbitrary-shaped gratings which need not be small in size was developed for radiated power from traveling waves as a function of grating tooth height, tooth width, refractive index, waveguide thickness, and period.