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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 27 — Dec. 17, 2012
  • pp: 28292–28300

High Q H1 photonic crystal nanocavities with efficient vertical emission

Hiroyuki Takagi, Yasutomo Ota, Naoto Kumagai, Satomi Ishida, Satoshi Iwamoto, and Yasuhiko Arakawa  »View Author Affiliations

Optics Express, Vol. 20, Issue 27, pp. 28292-28300 (2012)

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We report on newly-designed H1-type photonic crystal (PhC) nanocavities that simultaneously exhibit high Q factors, small mode volumes, and high external coupling efficiencies (η) of light radiated above the PhC membrane. Dipole modes of the H1 PhC nanocavities, which are doubly-degenerate and orthogonally-polarized in theory, are investigated both by numerical calculations and experiments. Through modifying the sizes and positions of the air-holes near to the defect cavity, a Q factor of 62,000 is achieved, accompanied with an improved η of 0.38 (assuming an objective lens with a numerical aperture of 0.65). A further increase of η to more than 0.60 is observed at the expense of slight degradation of Q factor (down to 50,000). We further experimentally confirm the increase of both Q and η, using micro-photoluminescence measurements, and demonstrate high Q factors up to 25,000: the highest value ever reported for dipole modes in H1 PhC nanocavities.

© 2012 OSA

OCIS Codes
(230.5750) Optical devices : Resonators
(230.5298) Optical devices : Photonic crystals

ToC Category:
Photonic Crystals

Original Manuscript: August 6, 2012
Revised Manuscript: October 28, 2012
Manuscript Accepted: October 31, 2012
Published: December 6, 2012

Hiroyuki Takagi, Yasutomo Ota, Naoto Kumagai, Satomi Ishida, Satoshi Iwamoto, and Yasuhiko Arakawa, "High Q H1 photonic crystal nanocavities with efficient vertical emission," Opt. Express 20, 28292-28300 (2012)

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