Square lattice photonic crystal point-shifted nanocavity with lowest-order whispering-gallery mode | Zendy

Tsan-Wen Lu | Zendy; Pin-Tso Lin | Zendy; Kuan-Un Sio | Zendy; Po-Tsung Lee | Zendy

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Square lattice photonic crystal point-shifted nanocavity with lowest-order whispering-gallery mode

Author(s) -

Tsan-Wen Lu,

Pin-Tso Lin,

Kuan-Un Sio,

Po-Tsung Lee

Publication year - 2010

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.18.002566

Subject(s) - whispering gallery wave , photonic crystal , optics , q factor , lasing threshold , mode volume , polarization (electrochemistry) , square lattice , materials science , dielectric , physics , optoelectronics , resonator , wavelength , condensed matter physics , fiber optic sensor , chemistry , optical fiber , ising model , graded index fiber

We propose a point-shifted nanocavity based on square lattice photonic crystal, which sustains a lowest-order whispering-gallery (WG) mode. In simulation, the optimized WG mode (quality (Q) factor approximately 14,000) in point-shifted nanocavity can be with smaller mode volume (approximately 5.5(lambda/2n)(3)) but larger nano-post tolerance than those in single-defect cavity design. From well-fabricated device, single WG mode lasing with measured Q factor of 4,100 and low threshold of 160 microW is obtained. Besides, we also observe the changed polarization of WG mode due to modal symmetry breaking caused by the presence of a nearby dielectric nano-particle, which would be useful in sensing molecule binding or attaching for bio-chemical applications.

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