Surface functionalization of micro-resonators

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A micro-cavity resonator including a micro-cavity having a doped sol gel layer or solution applied thereto. The dopant can be various rare earth elements, such as erbium. The micro-cavity can be a spherical or disk or toroid shaped micro-cavity. Certain cavities are capable of high and ultra-high Q factors. Optical energy travels along an inner surface of the coated micro-cavity at a wavelength influenced or determined by the dopant in the coating.