Silica optical microcavities are mainstay photonic devices, valued for their intrinsically ultra-low loss in the broadband spectra and mature fabrication processes, but unfortunately, they suffer from low second- and third-order optical nonlinearity. A notable feature of the microcavity is the inherent leaking evanescent field at the surface, which opens the window for light-matter interactions at the surface.
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Source: Phys.org