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Article Dans Une Revue Advanced Optical Materials Année : 2023

THz Ultra‐Strong Light–Matter Coupling up to 200 K with Continuously‐Graded Parabolic Quantum Wells

Résumé

Continuously graded parabolic quantum wells with excellent optical performances are used to overcome the low-frequency and thermal limitations of square quantum wells at terahertz (THz) frequencies. The formation of microcavity intersubband polaritons at frequencies as low as 1.8 THz is demonstrated, with a sustained ultra-strong coupling regime up to a temperature of 200 K. Thanks to the excellent intersubband transition linewidth, polaritons present quality factors up to 17. It is additionally shown that the ultra-strong coupling regime is preserved when the active region is embedded in sub-wavelength resonators, with an estimated relative strength η = ΩR/ω0 = 0.12. This represents an important milestone for future studies of quantum vacuum radiation because such resonators can be optically modulated at ultrafast rates, possibly leading to the generation of non-classical light via the dynamic Casimir effect. Finally, with an effective volume of 2.10−6λ3 0, it is estimated that fewer than 3000 electrons per resonator are ultra-strongly coupled to the quantized electromagnetic mode, proving it is also a promising approach to explore few-electron polaritonic systems operating at relatively high temperatures.
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hal-04062827 , version 1 (07-04-2023)

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Paul Goulain, Chris Deimert, Mathieu Jeannin, Stefano Pirotta, Wojciech Julian Pasek, et al.. THz Ultra‐Strong Light–Matter Coupling up to 200 K with Continuously‐Graded Parabolic Quantum Wells. Advanced Optical Materials, inPress, pp.2202724. ⟨10.1002/adom.202202724⟩. ⟨hal-04062827⟩
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