Controlling the resonance of a photonic crystal microcavity by a near-field probe.
We demonstrate theoretically that the resonance frequencies of high-Q microcavities in two-dimensional photonic crystal membranes can be tuned over a wide range by introducing a subwavelength dielectric tip into the cavity mode. Three-dimensional finite-difference time-domain simulations show that by varying the lateral and vertical positions of the tip, it is possible to tune the resonator frequency without lowering the quality factor. Excellent agreement with a perturbative theory is obtained, showing that the tuning range is limited by the ratio of the cavity mode volume to the effective polarizability of the nanoperturber.
Koenderink
A Femius
AF
Laboratory of Physical Chemistry, Swiss Federal Institute of Technology (ETH), 8093 Zürich, Switzerland.
Kafesaki
Maria
M
Buchler
Ben C
BC
Sandoghdar
Vahid
V