Nonlinear terahertz metamaterial perfect absorbers using GaAs [Invited]


Journal Article

© 2016 Chinese Laser Press. We investigate the nonlinear response of terahertz (THz) metamaterial perfect absorbers consisting of electric split ring resonators on GaAs integrated with a polyimide spacer and gold ground plane. These perfect absorbers on bulk semi-insulating GaAs are characterized using high-field THz time-domain spectroscopy. The resonance frequency redshifts 20 GHz and the absorbance is reduced by 30% as the incident peak field is increased from 30 to 300 kV/cm. The nonlinear response arises from THz field driven interband transitions and intervalley scattering in the GaAs. To eliminate the Fresnel losses from the GaAs substrate, we design and fabricate a flexible metamaterial saturable perfect absorber. The ability to create nonlinear absorbers enables appealing applications such as optical limiting and self-focusing.

Full Text

Cited Authors

  • Zhao, X; Zhang, J; Fan, K; Duan, G; Metcalfe, GD; Wraback, M; Zhang, X; Averitt, RD

Published Date

  • June 1, 2016

Published In

Volume / Issue

  • 4 / 3

Start / End Page

  • A16 - A21

International Standard Serial Number (ISSN)

  • 2327-9125

Digital Object Identifier (DOI)

  • 10.1364/PRJ.4.000A16

Citation Source

  • Scopus