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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 14 — Jul. 2, 2012
  • pp: 15503–15515

Photonic crystal nanocavities fabricated from chalcogenide glass fully embedded in an index-matched cladding with a high Q-factor (>750,000)

Xin Gai, Barry Luther-Davies, and Thomas P. White  »View Author Affiliations

Optics Express, Vol. 20, Issue 14, pp. 15503-15515 (2012)

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We have designed and fabricated a 2-D photonic crystal hetero-structure cavity in the chalcogenide glass Ge11.5As24Se64.5 that is fully embedded in a cladding with refractive index of 1.44. The low index contrast of this structure (≈1.21) means that high-Q resonances cannot be obtained using standard hetero-structure cavity designs based on W1 waveguides. We show that reducing the waveguide width can substantially improve light confinement, leading to high-Q resonances in a hetero-structure cavity. Numerical simulations indicate intrinsic Qv > 107 are possible with this approach. Experimentally, an optical cavity with a high intrinsic Qv>7.6 x 105 was achieved in a structure with a theoretical Qv = 1.7 x 106.

© 2012 OSA

OCIS Codes
(160.2750) Materials : Glass and other amorphous materials
(230.5750) Optical devices : Resonators
(220.4241) Optical design and fabrication : Nanostructure fabrication
(130.5296) Integrated optics : Photonic crystal waveguides

ToC Category:
Photonic Crystals

Original Manuscript: May 17, 2012
Revised Manuscript: June 18, 2012
Manuscript Accepted: June 21, 2012
Published: June 25, 2012

Xin Gai, Barry Luther-Davies, and Thomas P. White, "Photonic crystal nanocavities fabricated from chalcogenide glass fully embedded in an index-matched cladding with a high Q-factor (>750,000)," Opt. Express 20, 15503-15515 (2012)

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