US 11,940,386 B2
Photonic sensor using a fixed-wavelength laser
Lukas Chrostowski, Vancouver (CA); Sudip Shekhar, Vancouver (CA); Samantha Grist, Vancouver (CA); Karen C. Cheung, Vancouver (CA); and Mohammed Ali Al-Qadasi, Vancouver (CA)
Assigned to The University of British Columbia, Vancouver (CA)
Filed by The University of British Columbia, Vancouver (CA)
Filed on Sep. 6, 2022, as Appl. No. 17/903,931.
Application 17/903,931 is a continuation of application No. PCT/CA2021/050497, filed on Apr. 13, 2021.
Claims priority of provisional application 63/009,033, filed on Apr. 13, 2020.
Prior Publication US 2023/0081317 A1, Mar. 16, 2023
Int. Cl. G01N 21/77 (2006.01); G01N 21/39 (2006.01)
CPC G01N 21/774 (2013.01) [G01N 21/39 (2013.01); G01N 21/7746 (2013.01); G01N 2021/7779 (2013.01); G01N 2021/7789 (2013.01)] 29 Claims
OG exemplary drawing
 
1. A method for monitoring a sample for at least one analyte, the method comprising:
placing the sample in contact with a sensing portion of an optical waveguide and directing light having a fixed wavelength through the optical waveguide, wherein contact of the analyte with the waveguide alters a phase shift of the light effected by the sensing portion of the optical waveguide;
modulating a phase shift of the light effected by a phase shift portion of the waveguide distinct from the sensing portion of the waveguide;
monitoring an intensity of the light relative to the phase shift of the light effected by the phase shift portion of the waveguide; and
wherein the sensing portion of the optical waveguide is part of a first one of a plurality of sensors connected in a cascade and the method comprises using an optical detector common to the plurality of sensors to monitor the intensity of the light relative to a corresponding phase shift of the light effected by the corresponding phase shift portion of the waveguide for each of the plurality of sensors.