Advanced Photonics, Volume. 5, Issue 2, 026005(2023)
Optically controlled dielectric metasurfaces for dynamic dual-mode modulation on terahertz waves
Fig. 1. Schematic of the dynamic dual-mode modulation with an optically controlled dielectric metasurface. Under pumping by external light at different wavelengths, a predesigned dielectric metasurface can exhibit distinct functionalities to manipulate THz waves.
Fig. 2. Experimental demonstration of the dynamic dual-mode THz wave modulation. (a) Schematic of the basic meta-atom consisting of a quartz substrate and silicon pillar with the following geometrical parameters:
Fig. 3. Working mechanism of the dynamic dual-mode modulation. (a) The solid line represents the calculated penetration depth of silicon versus the wavelength; the blue star and red triangle represent the penetration depths of silicon for pump light at 515 and 1030 nm, respectively; the left (right) inset depicts the perturbed region [highlighted by red (blue) color] inside the silicon pillar pumped by external light at 515 nm (1030 nm). (b) FEM-simulated normalized spatial distributions of
Fig. 4. Experimental demonstration of a dynamic dual-mode metapolarizer. (a) Schematic of the metapolarizer exhibiting different polarization-manipulation functionality as pumped by external light at different wavelengths. The inset depicts part of the SEM image of the fabricated sample with a scale bar (white line) of
Fig. 5. Numerical demonstration of an optical information encryption metasurface. (a) Schematic of the proposed metadevice composed of two basic meta-atoms (see insets) arranged in a predesigned sequence. Geometrical parameters of meta-atom A are set as
Get Citation
Copy Citation Text
Haoyang Zhou, Sheng Zhang, Shunjia Wang, Yao Yao, Qingnan Cai, Jing Lin, Xiaoying Zheng, Zhuo Wang, Zhensheng Tao, Qiong He, Lei Zhou, "Optically controlled dielectric metasurfaces for dynamic dual-mode modulation on terahertz waves," Adv. Photon. 5, 026005 (2023)
Category: Research Articles
Received: Dec. 15, 2022
Accepted: Mar. 14, 2023
Published Online: Apr. 10, 2023
The Author Email: Zhensheng Tao (zhenshengtao@fudan.edu.cn), Qiong He (qionghe@fudan.edu.cn), Lei Zhou (phzhou@fudan.edu.cn)