Optical whispering-gallery mode barcodes for high-precision and wide-range temperature measurements

摘要

a Schematic of WGM sensing using the optical barcode technique. The light is coupled into and out of the MBR via a tapered fibre. We can directly obtain the sensing information from the optical barcode generated from the transmission spectrum. b Optical micrograph of the capillary (left) and fabricated MBR (right). The MBR is in the middle supported by capillaries on both sides. c Schematic of the packaged substrate containing the MBR and the tapered fibre. d Schematic of the setup. The light from a tuneable laser is used to probe the spectrum of the packaged WGM sensor. The light intensity is controlled by the attenuator and the polarization is controlled by the polarization controller. The transmission spectrum is received by a photodetector, which is connected to an oscilloscope and a computer with a data acquisition card for control of laser scanning and signal processing