We present the characterization of the recently developed cavity enhanced amplitude modulation laser absorption spectroscopy (CEAMLAS) technique to measure dissipation within the evanescent field of a whispering-gallery mode resonator, and demonstrate the parallel use of CEAMLAS and the Pound–Drever–Hall measurement techniques to provide both dissipation and dispersive real-time microresonator measurements. Using an atomic force microscope tip, we introduce a controlled perturbation to the evanescent field of the resonator. In this case, dissipative sensing allows up to 16.8 dB sensitivity improvement over dispersive measurements, providing the possibility for enhanced sensitivity in application such as biomolecule detection.
© 2013 Optical Society of AmericaFull Article | PDF Article
Iwan Märki, Martin Salt, and Hans Peter Herzig
Opt. Express 14(7) 2969-2978 (2006)
Marc Tobias Wenzel, Thomas Härtling, Phillip Olk, Susanne C. Kehr, Stefan Grafstræm, Stephan Winnerl, Manfred Helm, and Lukas M. Eng
Opt. Express 16(16) 12302-12312 (2008)
C. Junge, S. Nickel, D. O’Shea, and A. Rauschenbeutel
Opt. Lett. 36(17) 3488-3490 (2011)