Open AccessPolarization-independent high diffraction efficiency two-dimensional grating based on cylindrical hole nano arrays
Author(s) -
Bin Zhou,
Wei Jia,
Peng Sun,
Jin Wang,
Weicheng Liu,
Changhe Zhou
Publication year - 2020
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.402131
Subject(s) - optics , diffraction efficiency , grating , polarization (electrochemistry) , materials science , diffraction , diffraction grating , planar , dielectric , wavelength , blazed grating , transverse plane , optoelectronics , physics , chemistry , computer graphics (images) , structural engineering , engineering , computer science
In this paper, we propose a reflective two-dimensional (2D) metal-dielectric grating based on cylindrical hole nano arrays with excellent polarization-independent high diffraction efficiency. The effects of the geometrical parameters on the polarization characteristic and diffraction efficiency are studied. Optimized results show that the (-1, 0) order diffraction efficiency of transverse electric (TE) and transverse magnetic (TM) polarizations under Littrow mounting is 98.31% and 98.05% at 780 nm incident wavelength, and the diffraction efficiency equilibrium is 99.74%, which is a significant improvement over the previously reported 2D gratings. The high efficiency in both TE and TM polarizations makes it a potential candidate as planar grating rulers for high precision multi-axis displacement measurement. Moreover, the cylindrical hole-based structure performs well in manufacturing tolerances, which provides the possibility for practical applications.