1. Nanospectroscopy of a single patch antenna strongly coupled to a mid-infrared intersubband transition in a quantum well.
- Author
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Gillibert, Raymond, Malerba, Mario, Spirito, Davide, Giliberti, Valeria, Li, Lianhe, Davies, A. Giles, Linfield, Edmund H., Baldassarre, Leonetta, Colombelli, Raffaele, and Ortolani, Michele
- Subjects
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QUANTUM wells , *QUANTUM transitions , *OPTICAL antennas , *ANTENNA arrays , *ANTENNAS (Electronics) , *RABI oscillations - 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. [ABSTRACT FROM AUTHOR]
- Published
- 2020
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