Abstract-High-efficiency full-phase modulation of a terahertz wave based on a dielectric metasurface

Xiaorong Hong, Shuai Feng, Honglian Guo and Chuanbo Li

https://iopscience.iop.org/article/10.1088/1612-202X/ab2121/pdf

In this paper, we propose a transmissive terahertz metasurface, consisting of periodically arranged subwavelength silicon cross resonators. Based on the theory of electromagnetic dipole resonance, and changing the structural parameters and directions of cross resonators; the phase modulation of a terahertz wave can be realized at a target terahertz frequency. By employing full-wave finite element numerical simulation, we utilize the metasurface to achieve an almost full phase 2π control in the terahertz band, and the transmission efficiency is over 90%. The proposed transmissive metasurface has potential applications in some terahertz functional devices, such as lenses, wave plates and optical vortex converters.

Abstract-Optical device terahertz integration in a two-dimensional–three-dimensional heterostructure

Zhifang Feng, Jie Lin, and Shuai Feng

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-57-2-185&origin=search

The transmission properties of an off-planar integrated circuit including two wavelength division demultiplexers are designed, simulated, and analyzed in detail by the finite-difference time-domain method. The results show that the wavelength selection for different ports (0.404[𝑐/𝑎]$0.404[c/a]$ at 𝐵2$B_2$ port, 0.389[𝑐/𝑎]$0.389[c/a]$ at 𝐵3$B_3$ port, and 0.394[𝑐/𝑎]$0.394[c/a]$ at 𝐵4$B_4$ port) can be realized by adjusting the parameters. It is especially important that the off-planar integration between two complex devices is also realized. These simulated results give valuable promotions in the all-optical integrated circuit, especially in compact integration.

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