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1. WO2020221777 - SELF-REFERENCED SENSOR

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[ EN ]

CLAIMS

1.- A sensor comprising at least one whispering gallery mode resonator, wherein the resonator comprises a Bragg grating arranged over at least a portion of the perimeter of the resonator and wherein the resonator is selectively functionalized for the attachment of analyte receptors.

2.- The sensor according to claim 1 , wherein the grating is functionalized for the attachment of analyte receptors.

3.- The sensor according to any of the previous claims, wherein the resonator is made of a first material and the grating is made of a second material different to the first material.

4 The sensor according to any of the previous claims, wherein the grating is a grating of analyte receptors directly arranged over a surface of the resonator.

5.- The sensor according to any of the previous claims, wherein the resonator is made of at least a material selected from AI2O3, S13N4, S1O2, SiOn, T1O2, Ta20s, Te20s, phosphate glass, KY(W04)2, YAG, ZBLAN.

6.- The sensor according to any of the previous claims, wherein the grating is made of a material comprising at least one of a polymer, preferably PMMA, Si02, SiOn, SiN orTiC>2.

7.- The sensor according to any of the previous claims, wherein the period of the grating is substantially half the operating wavelength.

8.- The sensor according to any of the previous claims, wherein the resonator material is doped with a material providing laser gain, preferably a rare-earth material, a semiconductor material, or a transition metal ion doped material.

9.- The sensor according to any of the previous claims, wherein the sensor is functionalized over only a part of its perimeter, preferably over a quarter of the perimeter or over a half of the perimeter.

10.- The sensor according to any of the previous claims, wherein:

the resonator is a ring resonator embodied as a looped optical waveguide and the sensor further comprises a coupling mechanism to access the looped optical waveguide, or

the resonator is shaped as a disk and the sensor further comprises a coupling mechanism to access the disk.

11.- The sensor according to any of the previous claims, wherein the resonator has a closed loop configuration comprising a plurality of sections, each section being configured for coupling with an optical waveguide at a wavelength.

12.- The sensor according to any of the previous claims, wherein the resonator is fabricated in rare-earth doped AI2O3, wherein the rare-earth ions provide emission outside the absorption bands of water, the rare-earth ions being preferably selected from the group consisting of Yb3+, Nd3+, Er3+, Tm3+, and Ho3+.

13.- The sensor according to any of the previous claims, wherein the sensor comprises a plurality of resonators and a plurality of chambers, wherein the resonators are arranged such that each chamber comprises one resonator, wherein the sensor comprises a plurality of openings, each opening providing fluid communication between two adjacent chambers, and wherein the openings have different size.

14.- A sensing system comprising:

a sensor according to any of the previous claims, and

a readout unit configured to receive the sensor and preferably comprising aligning means for aligning the sensor.

15.- The sensing system according to claim 14, further comprising a laser configured to optically pump the at least one resonator when the sensor is received in the readout unit, a photodetector and processing electronics.