Year
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(Peer-Reviewed) Multi-cycle reconfigurable THz extraordinary optical transmission using chalcogenide metamaterials
Tun Cao 曹暾 ¹, Meng Lian 廉盟 ¹, Xieyu Chen 陈勰宇 ², Libang Mao 毛立邦 ¹, Kuan Liu 刘宽 ¹, Jingyuan Jia 贾婧媛 ¹, Ying Su 苏莹 ¹, Haonan Ren 任浩楠 ¹, Shoujun Zhang ², Yihan Xu ², Jiajia Chen ², Zhen Tian 田震 ², Dongming Guo 郭东明 ³
¹ School of Optoelectronic Engineering and Instrumentation Science, Dalian University of Technology, Dalian 116024, China
中国 大连 大连理工大学光电工程与仪器科学学院
² Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
天津大学精密仪器与光电子工程学院 太赫兹中心
³ School of Mechanical Engineering, Dalian University of Technology, Dalian 116024, China
中国 大连 大连理工大学机械工程学院
Opto-Electronic Science, 2021-11-30
Abstract

Metamaterials composed of metallic antennae arrays are used as they possess extraordinary optical transmission (EOT) in the terahertz (THz) region, whereby a giant forward light propagation can be created using constructive interference of tunneling surface plasmonic waves. However, numerous applications of THz meta-devices demand an active manipulation of the THz beam in free space.

Although some studies have been carried out to control the EOT for the THz region, few of these are based upon electrical modulation of the EOT phenomenon, and novel strategies are required for actively and dynamically reconfigurable EOT meta-devices.

In this work, we experimentally present that the EOT resonance can be coupled to optically reconfigurable chalcogenide metamaterials which offers a reversible all-optical control of the THz light. A modulation efficiency of 88% in transmission at 0.85 THz is experimentally observed using the EOT metamaterials, which is composed of a gold (Au) circular aperture array sitting on a non-volatile chalcogenide phase change material (Ge2Sb2Te5) film.

This comes up with a robust and ultrafast reconfigurable EOT over 20 times of switching, excited by a nanosecond pulsed laser. The measured data have a good agreement with finite-element-method numerical simulation. This work promises THz modulators with significant on/off ratios and fast speeds.
Multi-cycle reconfigurable THz extraordinary optical transmission using chalcogenide metamaterials_1
Multi-cycle reconfigurable THz extraordinary optical transmission using chalcogenide metamaterials_2
Multi-cycle reconfigurable THz extraordinary optical transmission using chalcogenide metamaterials_3
Multi-cycle reconfigurable THz extraordinary optical transmission using chalcogenide metamaterials_4
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