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

Tsan Wen Lu*, Pin Tso Lin, Kuan Un Sio, Po Tsung Lee

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations

Abstract

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 ∼ 14,000) in point-shifted nanocavity can be with smaller mode volume (∼5.5(λ/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 μW 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.

Original languageEnglish
Pages (from-to)2566-2572
Number of pages7
JournalOptics Express
Volume18
Issue number3
DOIs
StatePublished - 1 Feb 2010

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