Font Size:

Sub-diffraction-limit resonators operating on the fundamental monopolar resonance: application to THz polaritons

Last modified: 2012-01-06

#### Abstract

We demonstrate semiconductor optical resonators with sub-wavelength dimensions

*in all three dimensions of space*. The maximum confinement is obtained for resonators with a diameter of 13 µm, which operate at a wavelength of*λ*= 272 µm. This corresponds to a*λ*_{eff}/6 confinement, where*λ*_{eff}is the wavelength inside the material (or*λ*/20, if the free space wavelength is considered). These highly sub wavelength devices operate on*the fundamental monopolar resonance*, which corresponds to the fundamental oscillation mode of split-ring resonators and it is usually inactive in optical resonators. As a proof of principle for cavity quantum electrodynamics experiments, we apply these resonators to THz ISB intersubband polaritons.#### Keywords

THz; Optical resonators; microcavities