Four equal-intensity laser output and physical analysis generated by reflective grating with a silver plate

Self Cite

In this paper, the application of rectangular metal reflective grating as a polarization device is studied using a rigorous coupled-wave analysis method. Three polarization reflection devices are presented in the terahertz band. In addition, data verification is achieved based on the finite element method and the light field distribution of the device is analyzed to explain the physical mechanism. One of these devices splits the planar light into two mutually orthogonal output beams. The efficiency of TE polarization is 98.07%, and the efficiency of TM polarization is 97.86%. Furthermore, the process parameters of the three polarization devices, as well as the influence of incident wavelength and incident angle on efficiencies are also studied in the terahertz band.

Section: Structure and Numerical Analyzationmentioning

confidence: 99%

Terahertz polarization reflective devices based on one-dimensional grating structure

Huang¹,

Wang²

2020

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“…Beam splitters are vital components in the field of modern optical devices that are widely used to split light into several beams and propagate them into different directions [1][2][3][4][5]. Multi-port beam splitters have been proven to be well applied to improve the speed of optical communication.…”

Section: Introductionmentioning

confidence: 99%

Microstructural characteristics of sandwiched T-shaped metamaterials for three-port splitting

Liang¹,

Wang²

2022

This paper presents a polarization-insensitive sandwiched three-port beam splitting grating at normal incidence. The grating adopts a sandwiched structure. Based on the rigorous coupled-wave analysis (RCWA) and the simulated annealing algorithm, the grating parameters are optimized to obtain the diffraction efficiencies of 32.83% at 0th order and 32.87% at ±1st orders for transverse electric polarization, and 32.63% at 0th order and 32.39% at ±1st orders for transverse magnetic polarization. Meanwhile, the calculation results of the finite element method are in general agreement with those of RCWA. In addition, the analysis results of grating period, duty cycle, and wavelength bandwidth further demonstrate the good wavelength bandwidth of the grating and its feasibility for practical production. Therefore, the grating can be widely used in actual production.

“…It can be a key optical device in optical systems such as optical communication [4] and optical switches [5,6]. Recently, research on polarization devices suitable for the visible and infrared regions [7][8][9][10][11][12][13][14] has become increasingly mature, and terahertz polarization devices have also begun to develop due to the wide application of terahertz electromagnetic waves (with frequency between 0.1 and 10 THz). At present, a considerable proportion of terahertz polarization devices are realized on fiber [15][16][17], metasurface [18][19][20][21][22][23][24] and photonic crystal [25,26] structures.…”

Section: Introductionmentioning

confidence: 99%

Multi-function beam control of terahertz wave by hybrid metamaterial

Huang¹,

Wang²

2021

Self Cite

In this paper, a novel multi-functional terahertz beam splitter model is proposed. Under the normal incidence of a 2.52 THz light wave, the hybrid metamaterial can implement ultra-uniform two-(±1st), three-(0th, ±1st), four-(±1st, ±2nd) and five-port (0th, ±1st, ±2nd) output for both transverse electric (TE) and transverse magnetic (TM) polarizations at different optimal structure. The efficiencies of each diffraction order are greater than 49.4% (two-port), 32.9% (three-port), 23.5% (four-port) and 19.5% (five-port). The electric field distribution of the metamaterial microstructure is calculated by finite element analysis, which can help understand the propagation process and mechanism of the light wave in a grating structure. In addition, for the sake of practical production and application, the incident wave band and structural parameters of the four kinds of splitter devices are analyzed.