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We propose a novel concept of optical delay lines where the tunable delay can be achieved by controlling the inter-resonator gap sizes in circuits of optically coupled microspheres.
It is shown that polycrystalline low index contrast opals with submillimeter domains provide spatio-spectral diversity of scattering images that can be used for measuring the wavelengths of diffusive sources of light with nanometer accuracy.
It is shown that coupled resonator optical waveguides made from long chains of polystyrene microspheres with 1% size dispersion possess resonant transmission properties due to optical tunneling between fundamental whispering-gallery modes with attenuation ~20 dB/mm
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