Ultrasensitive real-time measurement of dissipation and dispersion in a whispering-gallery mode microresonator

Date

2013-06-01

Authors

Knittel, Joachim
Chow, Jong H
Gray, Malcolm B
Taylor, Michael A
Bowen, Warwick P

Journal Title

Journal ISSN

Volume Title

Publisher

Optical Society of America

Abstract

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.

Description

Keywords

Keywords: Atomic force microscope (AFM); Biomolecule detection; Controlled perturbation; Laser absorption spectroscopy; Measurement techniques; Real time measurements; Sensitivity improvements; Whispering-gallery mode resonators; Atomic force microscopy; Evanescent

Citation

Source

Optics letters

Type

Journal article

Book Title

Entity type

Access Statement

Open Access

License Rights

DOI

10.1364/OL.38.001915

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