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Sub-micron ring, pillar and wall structures were written by two-photon polymerisation of a sol–gel resin using a femtosecond laser beam which was shaped using internal conical diffraction. The ring structure was written using a demagnified image of the ring-shaped beam which arises in conical diffraction of a narrow light beam. The pillar and wall structures were produced by imaging the Bessel beam...
The optical properties of diamond spherical-like particles, prepared by the hot-filament chemical vapor deposition technique on opal substrates, have been investigated. The particles were studied using scanning electron microscopy, micro-Raman spectroscopy and micro-photoluminescence techniques. The diamond particles, consisting of polycrystalline diamond, have a size of about 5μm. Periodic peaks...
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