A novel approach for tracking of whispering gallery modes (WGM) in real-time for dielectric cavities used in sensing application is presented in this paper. Real-time tracking for the shifts of the WGM can be used to measure the physical quantity of interest precisely, under high repetition rates. The tracking algorithm is based on cross-correlation signal processing technique which has been proved to be accurate in WGM shifts detection. In order to achieve portability, the aforementioned real-time algorithm is implemented using a single-board re-configurable input-output hardware. The hardware platform used combines a real-time processor and a field programmable gate array (FPGA), it also allows for data exchange between them. The tracking algorithm’s accuracy and real-time behavior is verified by preforming simulations based on experiments conducted on the dielectric cavity, where the cavity is used as a force sensor measuring mechanical compression. The light from a laser diode is tuned with rates up to 10 kHz and then tangentially coupled into the cavity to excite the WGM. Results show that shifts of the WGM are tracked by the algorithm providing real-time force readings.
Amir R. Ali, Amr N. Afifi, and Hazem Taha, "Optical signal processing and tracking of whispering gallery modes in real-time for sensing applications," Proc. SPIE 10249, Integrated Photonics: Materials, Devices, and Applications IV, 102490E (Presented at SPIE Microtechnologies: May 10, 2017; Published: 30 May 2017); https://doi.org/10.1117/12.2265613.
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