Sculpting ultrastrong light–matter coupling through spatial matter structuring
Author:
Mornhinweg Joshua12ORCID, Diebel Laura1, Halbhuber Maike1, Riepl Josef1, Cortese Erika3, De Liberato Simone34ORCID, Bougeard Dominique1, Huber Rupert1ORCID, Lange Christoph2ORCID
Affiliation:
1. Department of Physics , University of Regensburg , 93040 Regensburg , Germany 2. Department of Physics , TU Dortmund University , 44227 Dortmund , Germany 3. School of Physics and Astronomy , University of Southampton , Southampton , SO17 1BJ , UK 4. IFN – Istituto di Fotonica e Nanotecnologie, CNR , I-20133 Milan , Italy
Abstract
Abstract
The central theme of cavity quantum electrodynamics is the coupling of a single optical mode with a single matter excitation, leading to a doublet of cavity polaritons which govern the optical properties of the coupled structure. Especially in the ultrastrong coupling regime, where the ratio of the vacuum Rabi frequency and the quasi-resonant carrier frequency of light, ΩR/ω
c, approaches unity, the polariton doublet bridges a large spectral bandwidth 2ΩR, and further interactions with off-resonant light and matter modes may occur. The resulting multi-mode coupling has recently attracted attention owing to the additional degrees of freedom for designing light–matter coupled resonances, despite added complexity. Here, we experimentally implement a novel strategy to sculpt ultrastrong multi-mode coupling by tailoring the spatial overlap of multiple modes of planar metallic THz resonators and the cyclotron resonances of Landau-quantized two-dimensional electrons, on subwavelength scales. We show that similarly to the selection rules of classical optics, this allows us to suppress or enhance certain coupling pathways and to control the number of light–matter coupled modes, their octave-spanning frequency spectra, and their response to magnetic tuning. This offers novel pathways for controlling dissipation, tailoring quantum light sources, nonlinearities, correlations as well as entanglement in quantum information processing.
Funder
Leverhulme Trust Future and Emerging Technologies Deutsche Forschungsgemeinschaft
Publisher
Walter de Gruyter GmbH
Subject
Electrical and Electronic Engineering,Atomic and Molecular Physics, and Optics,Electronic, Optical and Magnetic Materials,Biotechnology
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