[16a-PB7-1~2] 3.14 Optics and Photonics English Session

English Presentation

[16a-PB7-2] Strong Coupling of an Intersubband Transition in a Quantum Cascade Detector with a Subwavelength Photonic Cavity Mode in the VLWIR Regime

〇JOEL PEREZURQUIZO¹, Shohei Hayashi¹, Kazuki Horita¹, Tatsuo Dougakiuchi¹, Kazuue Fujita¹ (1.Hamamatsu Photonics K.K)

Keywords:

light-matter interaction,quantum cascade detector,metamaterial

We demonstrate strong light–matter coupling in the very-long-wavelength infrared (VLWIR) using an InGaAs/InAlAs quantum cascade detector (QCD) integrated with subwavelength patch antenna resonators. The QCD employs a coupled quantum well design with a single absorbing transition at 78 meV (~15 um). Absorption measurements reveal clear polaritonic splitting and anticrossing as the cavity resonance approaches the intersubband transition, confirming strong coupling at VLWIR wavelengths. These results open a path to engineer absorption and enhance responsivity in VLWIR QCDs through hybrid light–matter states.