Abstract
Synthetic opal is an artificial photonic metamaterial composed from spherical globules of amorphous silica (SiO2) about 300nm in diameter. We report, for the first time to our knowledge, the origin of a narrow luminescence spectral peak (4nm HWHM) and optical second and third harmonic generation in synthetic opal samples under femtosecond laser excitation (800nm) at liquid-nitrogen temperature. Stimulated-emission effects are discussed related to the possibility of nanocavity lasing at the condition of the first Mie resonance in a dielectric sphere.
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