We demonstrate an optothermal resonance scanning scheme to obtain stable spectra of resonant modes in whispering gallery microresonators. A wavelength stability of 0.1 pm for a temperature variation of more than 10 °C is obtained. In this scheme, a resonance mode is thermally locked to a tunable laser, and its wavelength is linearly scanned across the lasing line of a fixed wavelength laser. The scheme enables reliable and accurate readings for whispering gallery mode (WGM) sensing platforms and allows the spectroscopy of WGM resonators within wavelength bands where tunable lasers are not available.
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Research Article| October 24 2011
Optothermal spectroscopy of whispering gallery microresonators
Şahin Kaya Özdemir;
Jiangang Zhu, Şahin Kaya Özdemir, Lina He, Lan Yang; Optothermal spectroscopy of whispering gallery microresonators. Appl. Phys. Lett. 24 October 2011; 99 (17): 171101. https://doi.org/10.1063/1.3656716
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