Nonlinear terahertz metamaterials with active electrical control
- Brown Univ., Providence, RI (United States). School of Engineering; Washington College, Chestertown, MD (United States). Dept. of Physics
- Brown Univ., Providence, RI (United States). School of Engineering
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies; Univ. at Buffalo, NY (United States). Dept. of Electrical Engineering
- Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States). Center for Integrated Nanotechnologies
Here, we present a study of an electrically modulated nonlinear metamaterial consisting of an array of split-ring resonators fabricated on n-type gallium arsenide. The resonant metamaterial nonlinearity appears as an intensity-dependent transmission minimum at terahertz frequencies and arises from the interaction between local electric fields in the split-ring resonator (SRR) capacitive gaps and charge carriers in the n-type substrate. We investigate the active tuning range of the metamaterial device as the incident terahertz field intensity is increased and conversely the effect of an applied DC bias on the terahertz field-induced nonlinear modulation of the metamaterial response. Applying a DC bias to the metamaterial sample alters the nonlinear response and reduces the net nonlinear modulation. Similarly, increasing the incident terahertz field intensity decreases the net modulation induced by an applied DC bias. Finally, we interpret these results in terms of DC and terahertz-field-assisted carrier acceleration, scattering, and multiplication processes, highlighting the unique nature of this DC-field modulated terahertz nonlinearity.
- Research Organization:
- Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States); Brown Univ., Providence, RI (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); US Army Research Office (ARO); National Science Foundation (NSF)
- Grant/Contract Number:
- NA0003525; AC52-06NA25396
- OSTI ID:
- 1477886
- Alternate ID(s):
- OSTI ID: 1392709
- Report Number(s):
- SAND-2018-9641J; 667550
- Journal Information:
- Applied Physics Letters, Vol. 111, Issue 12; ISSN 0003-6951
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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