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5 March 2021 Terahertz saturable absorbers exploiting intersubband polaritons
Leonardo Viti, Francesco P. Mezzapesa, Jürgen Raab, Liahne Li, Giles A. Davies, Edmund H. Linfield, Christoph Lange, Rupert Huber, Miriam S. Vitiello
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Proceedings Volume 11705, Novel In-Plane Semiconductor Lasers XX; 117050W (2021) https://doi.org/10.1117/12.2578499
Event: SPIE OPTO, 2021, Online Only
Abstract
We devise a THz polaritonic saturable absorber exploiting ultra-strong coupled intersubband cavity polaritons generated in a multi quantum well (MQW) heterostructure. By coupling the polaritonic saturable absorber reflector with a high bandwidth heterogeneous THz QCL frequency comb (2.3-3.8 THz) we demonstrate spectral reshaping of the QCL emission and a major increase of the comb operational dynamic range up to 38% characterized by a stable single and narrow intermode beatnote.
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Leonardo Viti, Francesco P. Mezzapesa, Jürgen Raab, Liahne Li, Giles A. Davies, Edmund H. Linfield, Christoph Lange, Rupert Huber, and Miriam S. Vitiello "Terahertz saturable absorbers exploiting intersubband polaritons", Proc. SPIE 11705, Novel In-Plane Semiconductor Lasers XX, 117050W (5 March 2021); https://doi.org/10.1117/12.2578499
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KEYWORDS
Terahertz radiation
Polaritons
Mirrors
Quantum cascade lasers
Spectroscopy
Gold
Heterojunctions
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