Transition from strong to ultra-strong coupling regime in mid-infrared metal-dielectric-metal cavities

Abstract

We have investigated the transition from strong to ultra-strong coupling regime between a mid-infrared intersubband excitation and the fundamental mode of a metal-dielectric-metal microcavity. The ultra-strong coupling regime is demonstrated up to room temperature for a wavelength of $11.7\mu$m by using 260 nm thick cavities, which impose an extreme sub-wavelength confinement. By varying the doping of our structures we show that the experimental signature of the transition to the ultra-strong coupling regime is the opening of a photonic gap in the polariton dispersion. The width of this gap depends quadratically on the ratio between the Rabi and intersubband transition energies.

References in corpus (5)

• Quantum vacuum properties of the intersubband cavity polariton field
• Ultra-Strong Light-Matter Coupling Regime with Polariton Dots
• Optical properties of metal-dielectric-metal microcavities in the THz frequency range
• Electrically injected cavity polaritons
• Coupling of a surface plasmon with localized subwavelength microcavity modes

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• Polaritonic spectroscopy of intersubband transitions
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