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Tuning of High-Q Photonic Crystal Microcavities by a Subwavelength Near-field Probe

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arxiv cond-mat/0412394 v1 pith:NPDXANEF submitted 2004-12-15 cond-mat.other

Tuning of High-Q Photonic Crystal Microcavities by a Subwavelength Near-field Probe

A.F. Koenderink (1) , M. Kafesaki (2) , B.C. Buchler (1) , V. Sandoghdar (1) ((1) Nano-Optics Group , ETH Zurich , Switzerland. (2) IESL-FORTH , Heraklion , Greece) This is my paper
classification cond-mat.other
keywords cavitycrystalhigh-qmicrocavitiesmodephotonicrangesubwavelength
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We demonstrate 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 (FDTD) 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 nano-perturber.

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