Patent ID: 9335259
Filing Date: 2016-05-10
CPC Classification: G01N,H01S

Claim Text:
1. A microelectronic photoacoustic detection device comprising at least one substrate comprising cavities forming a Helmholtz type differential acoustic resonator; acoustic detectors coupled to two of said cavities forming chambers of the resonator; a light source capable of emitting a light beam at at least one given wavelength; an optical waveguide comprising a first end optically coupled to the light source and a second end optically coupled to a first of the two chambers; in which the second end comprises, at an interface with the first chamber, a width of value greater than that of the width of the first end and greater than that of said at least one given wavelength, and/or in which the photoacoustic detection device comprises at least one diffraction grating arranged in the second end of the waveguide and capable of diffracting a first part of the light beam towards a lower reflective layer arranged under the second end and a second part of the light beam towards an upper reflective layer arranged at an upper wall of the first chamber.