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Ultrafast Modulation of THz Waves Based on MoTe2-Covered Metasurface

Authors :
Xing Xu
Jing Lou
Mingxin Gao
Shiyou Wu
Guangyou Fang
Yindong Huang
Source :
Sensors, Vol 23, Iss 3, p 1174 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

The sixth generation (6G) communication will use the terahertz (THz) frequency band, which requires flexible regulation of THz waves. For the conventional metallic metasurface, its electromagnetic properties are hard to be changed once after being fabricated. To enrich the modulation of THz waves, we report an all-optically controlled reconfigurable electromagnetically induced transparency (EIT) effect in the hybrid metasurface integrated with a 10-nm thick MoTe2 film. The experimental results demonstrate that under the excitation of the 800 nm femtosecond laser pulse with pump fluence of 3200 μJ/cm2, the modulation depth of THz transmission amplitude at the EIT window can reach 77%. Moreover, a group delay variation up to 4.6 ps is observed to indicate an actively tunable slow light behavior. The suppression and recovery of the EIT resonance can be accomplished within sub-nanoseconds, enabling an ultrafast THz photo-switching and providing a promising candidate for the on-chip devices of the upcoming 6G communication.

Details

Language :
English
ISSN :
23031174 and 14248220
Volume :
23
Issue :
3
Database :
Directory of Open Access Journals
Journal :
Sensors
Publication Type :
Academic Journal
Accession number :
edsdoj.99a11e907d04424699e5b8ed3eab77c1
Document Type :
article
Full Text :
https://doi.org/10.3390/s23031174