Tunable cryogenic THz cavity for strong light-matter coupling in complex materials

Giacomo Jarc; Shahla Yasmin Mathengattil; Francesca Giusti; Maurizio Barnaba; Abhishek Singh; Angela Montanaro; Filippo Glerean; Enrico Maria Rigoni; Simone Dal Zilio; Stephan Winnerl; Daniele Fausti

doi:10.1063/5.0080045

arXiv · 2112.01560

Tunable cryogenic THz cavity for strong light-matter coupling in complex materials

Giacomo Jarc·Shahla Yasmin Mathengattil·Francesca Giusti·Maurizio Barnaba·Abhishek Singh·Angela Montanaro·Filippo Glerean·Enrico Maria Rigoni·Simone Dal Zilio·Stephan Winnerl·Daniele Fausti

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Abstract

We report here the realization and commissioning of an experiment dedicated to the study of the optical properties of light matter hybrids constituted of crystalline samples embedded in an optical cavity. The experimental assembly developed offers the unique opportunity to study the weak and strong coupling regime between a tunable optical cavity in cryogenic environment and low energy degrees of freedom such as phonons, magnons or charge fluctuations. We describe here the setup developed which allows the positioning of crystalline samples in an optical cavity of different quality factor, the tuning of the cavity length at cryogenic temperatures and its optical characterization with a broadband time domain THz spectrometer (0.2-6 THz). We demonstrate the versatility of the setup by studying the vibrational strong coupling in CuGeO3 single crystal at cryogenic temperatures.

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Giacomo Jarc, Shahla Yasmin Mathengattil, Francesca Giusti, Maurizio Barnaba, Abhishek Singh, Angela Montanaro, Filippo Glerean, Enrico Maria Rigoni, Simone Dal Zilio, Stephan Winnerl, Daniele Fausti. 2021-11-28. Tunable cryogenic THz cavity for strong light-matter coupling in complex materials. https://doi.org/10.1063/5.0080045

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