Scanning-probe-assisted mid-infrared nano-spectroscopy is employed to reveal the polaritonic dispersion of individual MIM (metal-insulator-metal) square patch antennas whose modes can be strongly coupled to a mid-infrared intersubband transition. The patch antenna side length L sets the resonances between λ = 5.5 μm and 12.5 μm. The active region consists of a highly doped AlInAs/InGaAs/AlInAs single quantum well that presents an intersubband transition at 1190 cm-1 (λ = 8.4 μm). When the patch antenna optical resonance approaches and matches the intersubband transition frequency (L ∼1.8 μm), a clear anticrossing behavior - evidence of strong coupling - is observed in the near-field scattering phase spectra of individual antennas. The measured Rabi splitting is 4.5 THz. The near-field scattering spectra agree with the far-field extinction spectra acquired on arrays of identical antennas.

Nanospectroscopy of a single patch antenna strongly coupled to a mid-infrared intersubband transition in a quantum well / Gillibert, R.; Malerba, M.; Spirito, D.; Giliberti, V.; Li, L.; Davies, A. G.; Linfield, E. H.; Baldassarre, L.; Colombelli, R.; Ortolani, M.. - In: APPLIED PHYSICS LETTERS. - ISSN 0003-6951. - 117:10(2020), p. 101104. [10.1063/5.0018865]

Nanospectroscopy of a single patch antenna strongly coupled to a mid-infrared intersubband transition in a quantum well

Gillibert R.
Primo
Investigation
;
Giliberti V.;Baldassarre L.;Ortolani M.
Ultimo
Conceptualization
2020

Abstract

Scanning-probe-assisted mid-infrared nano-spectroscopy is employed to reveal the polaritonic dispersion of individual MIM (metal-insulator-metal) square patch antennas whose modes can be strongly coupled to a mid-infrared intersubband transition. The patch antenna side length L sets the resonances between λ = 5.5 μm and 12.5 μm. The active region consists of a highly doped AlInAs/InGaAs/AlInAs single quantum well that presents an intersubband transition at 1190 cm-1 (λ = 8.4 μm). When the patch antenna optical resonance approaches and matches the intersubband transition frequency (L ∼1.8 μm), a clear anticrossing behavior - evidence of strong coupling - is observed in the near-field scattering phase spectra of individual antennas. The measured Rabi splitting is 4.5 THz. The near-field scattering spectra agree with the far-field extinction spectra acquired on arrays of identical antennas.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1581480
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