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Auto-collimation diffraction of two-dimensional metal–dielectric grating with azimuth angle of 45°

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Publicado en:Nanophotonics vol. 14, no. 1 (2025), p. 33
Autor principal: Yi-Han, Wang
Otros Autores: Wang, Jin, Yu-Da, Chen, Zhi-Sen, Huang, Jia, Wei, Chang-He, Zhou
Publicado:
Walter de Gruyter GmbH
Materias:
Displacement measurement
Collimation
Azimuth
Electric polarization
Two dimensional materials
Diffraction efficiency
Light diffraction
High power lasers
Lasers
Polymethyl methacrylate
Design
Measurement techniques
Manufacturing
Light
Efficiency
Acceso en línea:Citation/Abstract
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Resumen:Grating under auto-collimation configuration with polarization-independent high diffraction efficiency plays an important role in the displacement measurement system, spectral beam combining system and so on. In this paper, we proposed, for the first time, a reflective two-dimensional metal-dielectric grating of which the (−1, −1) order beam is diffracted back along the input light direction, when the incident azimuth angle is 45°. With optimized structure, the (−1, −1) order diffraction efficiencies of transverse electric polarization (TE) and transverse magnetic polarization (TM) are 95.01 % and 95.04 % at incident wavelength of 632 nm, respectively. The structure based on the frustum of a cone performs well in manufacturing tolerance, which provides possibility for practical applications. A grating is fabricated experimentally in this research. The high efficiencies of TE and TM polarization have great application potential in 2D displacement measurement technique and high power laser systems.
ISSN:2192-8606
2192-8614
DOI:10.1515/nanoph-2024-0399
Fuente:Advanced Technologies & Aerospace Database