Journal
APPLIED PHYSICS LETTERS
Volume 111, Issue 19, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.5004194
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Funding
- U.S. Department of Energy's National Nuclear Security Administration [DE-NA-0003525]
- National Nuclear Security Administration of the U.S. Department of Energy [DE-AC52-06NA25396]
- Army Research Office
- National Science Foundation
- Div Of Electrical, Commun & Cyber Sys
- Directorate For Engineering [1505536] Funding Source: National Science Foundation
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Switchable metasurfaces fabricated on a doped epi-layer have become an important platform for developing techniques to control terahertz (THz) radiation, as a DC bias can modulate the transmission characteristics of the metasurface. To model and understand this performance in new device configurations accurately, a quantitative understanding of the bias-dependent surface characteristics is required. We perform THz variable angle spectroscopic ellipsometry on a switchable metasurface as a function of DC bias. By comparing these data with numerical simulations, we extract a model for the response of the metasurface at any bias value. Using this model, we predict a giant bias-induced phase modulation in a guided wave configuration. These predictions are in qualitative agreement with our measurements, offering a route to efficient modulation of THz signals. Published by AIP Publishing.
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