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.

Topics
Whispering gallery wave, Superconducting microresonators, Electrical properties and parameters, Cavity resonance, Optical properties, Spectroscopy, Thermal effects, Atomic spectral lines, Nanoparticle, Laser scanning
© 2011 American Institute of Physics.
2011
American Institute of Physics
You do not currently have access to this content.