INTEGRATED OPTICAL SENSOR FOR DETERMINING THE CONTENT OF IMPURITIES IN GAS-AIR MEDIA Russian patent published in 2022 - IPC G01N21/41 

FIELD: optical instrumentation.

SUBSTANCE: invention relates to the field of optical instrumentation and concerns an optical sensor for determining the presence of impurities in gas-air media. The sensor includes a substrate of an optically transparent dielectric material with a refractive index of n1 and a sensitive surface located on it formed by nanoparticles of an optically transparent dielectric material with a refractive index of n2>n1 having subwavelength dimensions and located at a subwavelength distance from each other. Nanoparticles are elementary cells having an asymmetric shape characterized by the absence of rotational symmetry, and are located on the substrate with the formation of a semiconductor structured metasurface in the form of a two-dimensional periodic lattice with collective resonances when exposed to femtosecond pulses.

EFFECT: increase in the resistance to temperature changes and increase in the sensitivity of the sensor.

5 cl, 5 dwg