Abstracts » Zoology and wildlife conservation

Fabrication of photonic crystals for the visible spectrum by holographic lithography

Article Abstract:

Three-dimensional holographic lithography is a suitable technique for the production of three-dimensional structures with sub-micrometre periodicity. This research has involved producing periodic microstructure by interference of four non-coplanar laser beams in a film of photoresist typically 30 micrometres thick. This fabrication method has the high spatial resolution needed to produce photonic crystals for the visible spectrum. It also produces the connected air and dielectric networks that are significant for the opening of a full bandgap. Scanning electron microscopy analysis of the polymeric films indicates defect-free crystalline order on length scales of hundreds of lattice constants.

Thin films

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Large second-order optical polarizabilities in mixed-valency metal complexes

Article Abstract:

The ease in adjusting the energy of Intervalence charge-transfer (ICVT) transition chromophore has a promising role in optoelectronic devices based on the nonlinear polarization of molecular materials. Mixed-valence compounds characterized by IVCT, in which donor and acceptor are metal atoms, might give a large second-order response. Material sensitivity is directly proportional to the applied voltage. The hyperpolarizability of bimetallic complex ions and organometallic analogues are reported. Applications range from semiconductor lasers to electro-optical modulators.

Analysis, Discovery and exploration, Optoelectronic devices, Crystal optics, Polarization (Electricity)

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Strain effects and phase transitions in photonic resonator crystals

Article Abstract:

Photonic resonator crystals were studied for strain effects and phase transitions.

Phase transformations (Statistical physics), Phase transitions (Physics)

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