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Advanced Sensing with Micro-optical Whispering-Gallery-Mode Resonators
The number of sensor applications is steadily growing, and new application areas are opening as well, confirming that the ability to accurately sense physical, chemical, or biological parameters is of paramount importance for science, engineering, and biomedicine. In parallel, sensor technologies are improving in terms of accuracy, reliability, efficiency, robustness, miniaturization, and communications capability. The past years have shown how far sensor technology can progress; photonics has definitely largely contributed to these advances. Photonic sensors, indeed, offer fast, light, cheap, and small-footprint components and products, very often characterized by high functionality and low energy usage. Further advances can be expected due to the development of quantum photonics: quantum control over light–matter interactions would enable new classes of measurement and communications solutions that have not been possible so far.
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