METHOD OF FORMING THERMOSENSITIVE NANOCOMPOSITE PHOTONIC CRYSTALS Russian patent published in 2012 - IPC G02B1/02 B82Y20/00 

FIELD: physics.

SUBSTANCE: method can be used in designing temperature sensors for optoelectronic systems. The method involves introduction of material with external temperature-variable properties into an opal structure obtained by etching colloidal particles which form the crystal lattice of a photonic crystal with the introduced opal, whose introduction is carried out by infiltrating an opal oxide precursor. The initial structure for the photonic crystal is formed by polystyrene particles via deposition on a flat substrate. Infiltration of the opal oxide precursor into the initial opal structure is carried out at pressure which is 1.2-1.5 times higher than atmospheric pressure and temperature 60-80°C. The introduced material is a mesomorphic substance which is a cholesteric liquid crystal, which is introduced by saturating at temperature higher than the temperature for transition of the liquid crystal an isotropic state (from 70°C), and at pressure 150-200 kPa, with a final operation for depositing onto the surface of the photonic crystal a metal layer with thickness of 150-300 nm by magentron sputtering at a rate of 20-40 nm/min in order to improve stability of the structure when heated.

EFFECT: obtaining nanocomposite photonic crystals based on opal with a photonic bandgap which is controlled by varying ambient temperature.

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