The upper branch broadening in ultrastrongly coupled THz landau polaritons

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The upper branch broadening in ultrastrongly coupled THz landau polaritons

Conference Paper (2019)

Author(s)

Shima Rajabali (ETH Zürich)

Giacomo Scalari (ETH Zürich)

Janine Keller (ETH Zürich)

Mattias Beck (ETH Zürich)

Jerome Faist (ETH Zürich)

Affiliation

External organisation

DOI related publication

https://doi.org/10.1109/IRMMW-THz.2019.8874524 Final published version

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Publication Year

2019

Language

English

Affiliation

External organisation

Article number

8874524

ISBN (electronic)

9781538682852

Event

44th International Conference on Infrared, Millimeter, and Terahertz Waves, IRMMW-THz 2019 (2019-09-01 - 2019-09-06), Paris, France

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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.