The upper branch broadening in ultrastrongly coupled THz landau polaritons

Conference paper (2019)

Authors

S. Rajabali ETH Zürich
Giacomo Scalari ETH Zürich
Janine Keller ETH Zürich
Mattias Beck ETH Zürich
Jérôme Faist ETH Zürich
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Published Date

2019

Language

English

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Abstract

We present our investigation on ultrastrong coupling of the Landau level transitions in a two dimensional electron gas to complementary split ring resonator arrays, as a terahertz metasurface. To achieve a higher coupling rate, the capacitive gap of the resonator is reduced systematically. This increment in the coupling rate is expected due to the enhanced vacuum field fluctuations in a smaller volume mode. However, our results indicate that the gap size reduction introduces a broadening in the upper polariton branch below a certain gap width.