Infrared light detection using a whispering-gallery-mode optical microcavity

Jiangang Zhu, Sahin Kaya Ozdemir, Lan Yang

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21 Scopus citations


We demonstrate a thermal infrared (IR) detector based on an ultra-high-quality-factor (Q) whispering-gallery-mode (WGM) microtoroidal silica resonator and investigate its performance to detect IR radiation at 10 μm wavelength. The bandwidth and the sensitivity of the detector are dependent on the power of a probe laser and the detuning between the probe laser and the resonance frequency of the resonator. The microtoroid IR sensor achieved a noise-equivalent-power (NEP) of 7.46nW, corresponding to an IR intensity of 0.095mW/cm2.

Original languageEnglish (US)
Article number171114
JournalApplied Physics Letters
Issue number17
StatePublished - Apr 28 2014

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)


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