Multi-cycle reconfigurable THz extraordinary optical transmission using chalcogenide metamaterials  

作　　者：Tun Cao Meng Lian Xieyu Chen Libang Mao Kuan Liu Jingyuan Jia Ying Su Haonan Ren Shoujun Zhang Yihan Xu Jiajia Chen Zhen Tian Dongming Guo 

机构地区：[1]School of Optoelectronic Engineering and Instrumentation Science,Dalian University of Technology,Dalian 116024,China [2]Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering,Tianjin University,Tianjin 300072,China [3]School of Mechanical Engineering,Dalian University of Technology,Dalian 116024,China

出　　处：《Opto-Electronic Science》2022年第1期26-36,共11页光电科学（英文）

摘　　要：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 manipula-tion 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 act-ively 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 metama-terials,which is composed of a gold(Au)circular aperture array sitting on a non-volatile chalcogenide phase change ma-terial(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 simula-tion.This work promises THz modulators with significant on/off ratios and fast speeds.

关 键 词：METAMATERIALS extraordinary optical transmission surface plasmon resonance RECONFIGURABLE phase change materials 

分 类 号：TN2[电子电信—物理电子学]