Modal analysis of 1 × 3 reflective triangular gratings under normal incidence

Abstract

Modal analysis of the 1 × 3 highly efficient reflective triangular grating operating in the 800 nm wavelength under normal incidence for TE polarization is presented in this Letter. The rigorous coupled wave analysis and simulated annealing algorithm are used to design this beam splitter. The reflective grating consists of a highly reflective mirror and a transmission grating on the top. The mechanism of the reflective triangular grating is clarified by the simplified modal method. Then, gratings are fabricated by direct laser writing lithography.

Double-groove reflection grating for three-channel beam separation at infrared wavelength

“…Guo and Ma designed a double-groove transmission three-port grating under TE polarization [26]. Wang et al designed reflective three-port triangular gratings [27] by means of the modal method and the rigorous coupled-wave analysis (RCWA) method. The diffraction of these designed three-port gratings is 0th and ±1st orders.…”

1*5 transmission grating splitter with triangular structure based on MgF2

“…The RCWA is a relatively straightforward and effective technique for obtaining the exact solution of Maxwell's equations for the electromagnetic diffraction of grating structure. Simulated annealing (SA) is a probabilistic technique which can approximate the global optimum of a given function [6,18,19].…”

“…The beamsplitters are key optical elements and have been widely used in the field of interferometers [1], optical measurement [2,3], optical crystal fabrication [4], dense wavelength division multiplexing [5] and so on [6][7][8]. Especially, the beam splitters with high efficiency and good uniformity are needed in the field of infrared band photoelectric technology, such as infrared measurement, infrared spectrometer and so on [9].…”