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 , 8 orders of magnitude greater than that for two indirectly coupled lossy cavities. The resolution of the thermal sensor reaches . 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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