Photonics Research, 2016, 4 (3): 03000A16, Published Online: Sep. 29, 2016  

Nonlinear terahertz metamaterial perfect absorbers using GaAs [Invited] Download: 1081次

Author Affiliations
1 Department of Mechanical Engineering, Boston University, 110 Cummington Mall, Boston, Massachusetts 02215, USA
2 Department of Physics, University of California, San Diego, 9500 Gilman Dr., La Jolla, California 92093, USA
3 Army Research Laboratory, 2800 Powder Mill Road, Adelphi, Maryland 20783, USA
4 e-mail: raveritt@ucsd.edu
Abstract
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 metamaterialsaturable perfect absorber. The ability to create nonlinear absorbers enables appealing applications such as optical limiting and self-focusing.authors would like to thank the Boston University Photonics Center for technical support.

Xiaoguang Zhao, Jingdi Zhang, Kebin Fan, Guangwu Duan, Grace D. Metcalfe, Michael Wraback, Xin Zhang, Richard D. Averitt. Nonlinear terahertz metamaterial perfect absorbers using GaAs [Invited][J]. Photonics Research, 2016, 4(3): 03000A16.

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