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Optics Express

Optics Express

  • Editor: Michael Duncan
  • Vol. 12, Iss. 26 — Dec. 27, 2004
  • pp: 6624–6631

Coupling of small, low-loss hexapole mode with photonic crystal slab waveguide mode

Guk-Hyun Kim, Yong-Hee Lee, Akihiko Shinya, and Masaya Notomi  »View Author Affiliations

Optics Express, Vol. 12, Issue 26, pp. 6624-6631 (2004)

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Coupling characteristics between the single-cell hexapole mode and the triangular-lattice photonic crystal slab waveguide mode is studied by the finite-difference time-domain method. The single-cell hexapole mode has a high quality factor (Q) of 3.3×106 and a small modal volume of 1.18(λ/n)3. Based on the symmetry, three representative types of coupling geometries (shoulder-couple, butt-couple and side-couple structures) are selected and tested. The coupling efficiency shows strong dependence on the transverse overlap of the cavity mode and the waveguide mode over the region of the waveguide. The shoulder-couple structure shows best coupling characteristics among three tested structures. For example, two shoulder-couple waveguides and a hexapole cavity result in a high performance resonant-tunneling-filter with Q of 9.7×105 and transmittance of 0.48. In the side-couple structure, the coupling strength is much weaker than that of the shoulder-couple structure because of the poor spatial overlap between the mode profiles. In the direct-couple structure, the energy transfer from the cavity to the waveguide is prohibited because of the symmetry mismatch and no coupling is observed.

© 2004 Optical Society of America

OCIS Codes
(230.5750) Optical devices : Resonators
(230.7370) Optical devices : Waveguides
(250.5300) Optoelectronics : Photonic integrated circuits

ToC Category:
Research Papers

Original Manuscript: November 17, 2004
Revised Manuscript: December 13, 2004
Published: December 27, 2004

Guk-Hyun Kim, Yong-Hee Lee, Akihiko Shinya, and Masaya Notomi, "Coupling of small, low-loss hexapole mode with photonic crystal slab waveguide mode," Opt. Express 12, 6624-6631 (2004)

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