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Transient GaAs plasmonic metasurfaces at terahertz frequencies

Journal Article · · ACS Photonics
 [1];  [2];  [1];  [1];  [1];  [1];  [3];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Indian Institute of Science Education and Research, Mohanpur (India)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

Here we demonstrate the ultrafast formation of terahertz (THz) metasurfaces through all-optical creation of spatially modulated carrier density profiles in a deep-subwavelength GaAs film. The switch-on of the transient plasmon mode, governed by the GaAs effective electron mass and electron–phonon interactions, is revealed by structured-optical pump THz probe spectroscopy, on a time scale of 500 fs. By modulating the carrier density using different pump fluences, we observe a wide tuning of the electric dipole resonance of the transient GaAs metasurface from 0.5 THz to 1.7 THz. Furthermore, we numerically demonstrate that the metasurface presented here can be generalized to more complex architectures for realizing functionalities such as perfect absorption, leading to a 30 dB modulation depth. In conclusion, the platform also provides a pathway to achieve ultrafast manipulation of infrared beams in the linear and, potentially, nonlinear regime.

Research Organization:
Sandia National Laboratories (SNL-NM), Albuquerque, NM (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
AC04-94AL85000
OSTI ID:
1338393
Alternate ID(s):
OSTI ID: 1400064
Report Number(s):
SAND--2016-12650J; 649940
Journal Information:
ACS Photonics, Journal Name: ACS Photonics Journal Issue: 1 Vol. 4; ISSN 2330-4022
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Femtosecond optical polarization switching using a cadmium oxide-based perfect absorber journal May 2017
High-efficiency and low-loss gallium nitride dielectric metasurfaces for nanophotonics at visible wavelengths journal November 2017
Accelerating terahertz all-optical modulation by hot carriers effects of silver nanorods in PVA film journal July 2019
Semiconductor infrared plasmonics journal May 2019
A Review of THz Modulators with Dynamic Tunable Metasurfaces journal July 2019