Fast amplitude modulation up to 1.5 GHz of mid-IR free-space beams at room-temperature

Stefano Pirotta (), Ngoc-Linh Tran, Arnaud Jollivet, Giorgio Biasiol, Paul Crozat, Jean-Michel Manceau, Adel Bousseksou and Raffaele Colombelli ()
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Stefano Pirotta: CNRS UMR 9001, Université Paris-Sud, Université Paris-Saclay
Ngoc-Linh Tran: CNRS UMR 9001, Université Paris-Sud, Université Paris-Saclay
Arnaud Jollivet: CNRS UMR 9001, Université Paris-Sud, Université Paris-Saclay
Giorgio Biasiol: Laboratorio TASC, CNR-IOM
Paul Crozat: CNRS UMR 9001, Université Paris-Sud, Université Paris-Saclay
Jean-Michel Manceau: CNRS UMR 9001, Université Paris-Sud, Université Paris-Saclay
Adel Bousseksou: CNRS UMR 9001, Université Paris-Sud, Université Paris-Saclay
Raffaele Colombelli: CNRS UMR 9001, Université Paris-Sud, Université Paris-Saclay

Nature Communications, 2021, vol. 12, issue 1, 1-6

Abstract: Abstract Applications relying on mid-infrared radiation (λ ~ 3-30 μm) have progressed at a very rapid pace in recent years, stimulated by scientific and technological breakthroughs like mid-infrared cameras and quantum cascade lasers. On the other side, standalone and broadband devices allowing control of the beam amplitude and/or phase at ultra-fast rates (GHz or more) are still missing. Here we show a free-space amplitude modulator for mid-infrared radiation (λ ~ 10 μm) that can operate at room temperature up to at least 1.5 GHz (−3dB cutoff at ~750 MHz). The device relies on a semiconductor heterostructure enclosed in a judiciously designed metal–metal optical resonator. At zero bias, it operates in the strong light-matter coupling regime up to 300 K. By applying an appropriate bias, the device transitions towards the weak-coupling regime. The large change in reflectance is exploited to modulate the intensity of a mid-infrared continuous-wave laser up to 1.5 GHz.

Date: 2021
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DOI: 10.1038/s41467-020-20710-2

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