Local observation and spectroscopy of optical modes in an active photonic-crystal microcavity

Phys Rev Lett. 2005 Mar 25;94(11):113907. doi: 10.1103/PhysRevLett.94.113907. Epub 2005 Mar 24.


We report the direct, room-temperature, near-field mapping and spectroscopy of the optical modes of a photonic-crystal microcavity containing quantum wells. We use a near-field optical probe to reveal the imprint of the cavity mode structure on the quantum-well emission. Furthermore, near-field spectroscopy allows us to demonstrate the strong spatial and spectral dependence of the coupling between the sources and the microcavity. This knowledge will be essential in devising future nanophotonic devices.