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

被引：13

作者：

Gillibert, Raymond ^{[1
]}

Malerba, Mario ^{[2
]}

Spirito, Davide ^{[3
]}

Giliberti, Valeria ^{[4
]}

Li, Lianhe ^{[5
]}

Davies, A. Giles ^{[5
]}

Linfield, Edmund H. ^{[5
]}

Baldassarre, Leonetta ^{[1
,3
]}

Colombelli, Raffaele ^{[2
]}

Ortolani, Michele ^{[1
,4
]}

机构：

[1] Sapienza Univ Rome, Dept Phys, I-00185 Rome, Italy

[2] Univ Paris Saclay, CNRS UMR 9001, Ctr Nanosci& Nanotechnol C2N, F-91120 Palaiseau, France

[3] IHP Leibniz Inst Innovat Mikroelekt, Technol Pk 25, D-15236 Frankfurt, Germany

[4] Ist Italiano Tecnol IIT, Ctr Life Nanosci, I-00169 Rome, Italy

[5] Univ Leeds, Sch Elect & Elect Engn, Woodhouse Lane, Leeds LS2 9JT, W Yorkshire, England

来源：

APPLIED PHYSICS LETTERS | 2020年 / 117卷 / 10期

基金：

英国工程与自然科学研究理事会; 欧盟地平线“2020”;

关键词：

FIELD; SPECTROSCOPY; ABSORPTION;

D O I：

10.1063/5.0018865

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

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 lambda =5.5 mu m and 12.5 mu m. The active region consists of a highly doped AlInAs/InGaAs/AlInAs single quantum well that presents an intersubband transition at 1190cm(-1) (lambda =8.4 mu m). When the patch antenna optical resonance approaches and matches the intersubband transition frequency (L similar to 1.8 mu m), 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 4.5THz. The near-field scattering spectra agree with the far-field extinction spectra acquired on arrays of identical antennas.

引用

页数：5

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