Controlling the resonance of a photonic crystal microcavity by a near-field 
probe

Koenderink, A. Femius; Kafesaki, Maria; Buchler, Ben C.; Sandoghdar, Vahid

doi:10.1103/PhysRevLett.95.153904

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Controlling the resonance of a photonic crystal microcavity by a near-field probe

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Citation

Koenderink, A. F., Kafesaki, M., Buchler, B. C., & Sandoghdar, V. (2005). Controlling the resonance of a photonic crystal microcavity by a near-field probe. Physical Review Letters, 95: 153904. doi:10.1103/PhysRevLett.95.153904.

Cite as: https://hdl.handle.net/21.11116/0000-0002-9B6A-9

Abstract

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.