All-Dielectric Metasurface-Based Quad-Beam Splitter in the Terahertz Regime

Abstract

Seeking the unprecedented ability of metasurfaces to manipulate terahertz waves in a desired manner has attracted increasing interest. We design and investigate a kind of multi-channel, polarization-dependent transmission-type dielectric metasurface-based terahertz beam splitter. It is numerically demonstrated that such metasurfaces can manipulate terahertz beam, and split it into four channels with alterable angles and orthogonal polarizations, under the linearly polarized incidence with both the x-and y-polarization components. The suggested regime may alleviate the shortage of advanced multifunctional devices and provide extra freedom for terahertz functional device design.

2020 Index IEEE Photonics Journal Vol. 12

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Multi-channel terahertz focused beam generator based on shared-aperture metasurface

“…As a simple and effective method to control electromagnetic waves, coding metasurfaces have attracted extensive attention in recent years. [1][2][3][4] By pre-arranging coding elements with different amplitudes and phases based on periodic or aperiodic laws, coding metasurfaces achieve radar cross section (RCS) noise reduction, [5,6] focusing, [7,8] beam splitting, [9,10] vortex, [11,12] etc. For example, in 2020, Han et al designed a metasurface composed of an inner rectangular ring and an outer Jerusalem cross structure combining "C" shaped branch to realize the RCS reduction function.…”

Triple-channel reflective splitter in terahertz band by second-order Littrow illumination

“…A terahertz polarization beam splitter is an essential functional device in terahertz systems. In recent years, different types of terahertz beam splitter [10][11][12][13] have been reported. The terahertz wave region is defined as electromagnetic radiation, with frequencies ranging from 0.1 to 10 THz.…”