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An imaging technique is presented that enables monitoring of the wet thermal oxidation of a thin AlAs layer embedded between two distributed Bragg reflector mirrors in a micropillar. After oxidation we confirm by white light reflection spectroscopy that high quality optical modes confined to a small volume have been formed. The combination of these two optical techniques provides a reliable and efficient...
Wavelength-sized silicon disk cavities in superfluid helium exhibit blue-shifted bistability near the λ-point when subject to high optical input power. At lower temperature, we observe symmetric lineshapes and obtain a large intracavity photon number of 40,000.
We demonstrate truly deep sub-wavelength nanoscale metamaterial optical nanocavities with anomalous scaling laws, by incorporating indefinite metamaterials with hyperbolic dispersion. Cavities with sizes down to ∼ λ/20 and high effective refractive index of 17.4 are realized.
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