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On-chip high-sensitivity temperature sensor based on gain–loss coupled microresonators

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Abstract

Microcavities based on asymmetrical Fano resonance have great potential in the application of ultra-sensitive sensors. In this paper, a very sharp asymmetrical Fano resonance is achieved by indirectly coupled gain–loss cavities. The sensitivity for detecting temperature can be enhanced up to 107/K, 8 orders of magnitude greater than that for two indirectly coupled lossy cavities. The resolution of the thermal sensor reaches 1013K. A thermal sensing mechanism based on coupled gain–loss optical cavities is investigated theoretically. The integrated structure shows potential to be an ultra-sensitive temperature microsensor.

© 2017 Optical Society of America

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