Phys.org  April 26, 2024 In the field of optical sensing, Whispering-Gallery-Mode (WGM) microresonators have emerged as promising candidates, offering the advantages of high sensitivity, high resolution, and small footprint. However, conventional sensing methods, which rely on tracking changes in a single mode, have a limited dynamic range of measurement. Researchers at Washington University developed a theoretical framework that offers comprehensive analytical insights for multimode-sensing techniques and demonstrated an optical WGM barcode technique that enabled simultaneous monitoring of the patterns of multiple modes that could provide over-FSR (Free spectral range) tracking with high resolution. They assessed the theoretical limits of measurement […]