Abstract-Broadband Terahertz Transparency in a Switchable Metasurface

Xiaoqiang Su 
Key Lab. of Optoelectron. Inf. & Technol., Tianjin Univ., Tianjin, China 
Chunmei Ouyang ; Ningning Xu ; Siyu Tan ; Jianqiang Gu ; Zhen Tian ; Jiaguang Han ; Fengping Yan ; Weili Zhang

http://ieeexplore.ieee.org/xpl/abstractAuthors.jsp?reload=true&arnumber=7008493&punumber%3D4563994

Plasmon-induced transparency in terahertz metamaterials markedly modifies the dispersive properties of an otherwise opaque medium and reveals unprecedented prospects on novel functional components. However, plasmon-induced transparency in metamaterials so far exists in a narrow frequency band or without actively tunable abilities. Here, we demonstrate optical control of a broadband plasmon-induced transparency in a hybrid metamaterial made from integrated silicon-metal unit cells. Attributed to the modification in damping rate of the dark mode resonators under optical excitation, a giant dynamic amplitude modulation of the broadband transparency window is observed. The scheme suggested here is promising in developing broadband active slow-light devices and realizing on-to-off switching responses of the terahertz radiation at room temperature.

(a) Schematic diagram of the active broadband PIT metamaterial. The geometrical parameters are: $l = 86 muhbox{m}$, $a = 28 muhbox{m}$, $b = 48 muhbox{m}$, $w = 4 muhbox{m}$, $D_{rm x}= 26 muhbox{m}$, $D_{rm y}= 10 muhbox{m}$, $P_{rm x}= 114 muhbox{m}$, and $P_{rm y}= 134 muhbox{m} $. The bottom right of panel (a) is a microscopic image of the fabricated metamaterial. (b) Experimental diagram of the optical pump-terahertz probe measurement.

Published in:

Photonics Journal, IEEE  (Volume:7 ,  Issue: 1 )

Article#:

5900108

ISSN :

1943-0655

INSPEC Accession Number:

14880065

DOI:

10.1109/JPHOT.2015.2390146

Date of Publication :

13 January 2015

Date of Current Version :

30 January 2015

Issue Date :

Feb. 2015

Sponsored by :

IEEE Photonics Society

Publisher:

IEEE