Whispering gallery modes in cylindrical integrated optics microcavities have, for what is to our knowledge the first time, been mapped with a photon scanning tunneling microscope. Optical images were obtained with a spatial resolution of 50 nm. By combination of information on the spatial optical distributions with wavelength-dependent measurements, an unexpectedly rich variety of intracavity phenomena, such as polarization conversion and interference of copropagating and counterpropagating modes, could be directly observed. A quantitative comparison of the experimental data with computer simulations results in a comprehensive understanding of the various whispering gallery modes inside the microcavity.
© 1999 Optical Society of America
(130.0130) Integrated optics : Integrated optics
(130.3120) Integrated optics : Integrated optics devices
(170.0110) Medical optics and biotechnology : Imaging systems
(170.5810) Medical optics and biotechnology : Scanning microscopy
M. L. M. Balistreri, D.J. W. Klunder, F. C. Blom*, A. Driessen, H. W. J. M. Hoekstra, J. P. Korterik, L. Kuipers, and N. F. van Hulst, "Visualizing the whispering gallery modes in a cylindrical optical microcavity," Opt. Lett. 24, 1829-1831 (1999)