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Journal of the Optical Society of America B

Journal of the Optical Society of America B

| OPTICAL PHYSICS

  • Editor: Henry van Driel
  • Vol. 29, Iss. 6 — Jun. 1, 2012
  • pp: 1356–1360

Simple boundary condition for terminating photonic crystal waveguides

Zhen Hu and Ya Yan Lu  »View Author Affiliations


JOSA B, Vol. 29, Issue 6, pp. 1356-1360 (2012)
http://dx.doi.org/10.1364/JOSAB.29.001356


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Abstract

Many photonic crystal (PhC) devices are nonperiodic structures due to the introduced defects in an otherwise perfectly periodic PhC, and they are often connected by PhC waveguides that serve as input and output ports. Numerical simulation of a PhC device requires boundary conditions to terminate PhC waveguides that extend to infinity. The rigorous boundary condition for terminating a PhC waveguide is a nonlocal condition that connects the wave field on the entire surface (or line in two-dimensional problems) transverse to the waveguide axis, and it is relatively difficult to use, especially for realistic devices, such as those in PhC slabs. In this paper, a simple approximate boundary condition involving a few points in the waveguide axis direction is introduced. The new boundary condition is used with the Dirichlet-to-Neumann map method to take advantage of the lattice structures and identical unit cells in PhC devices. Comparisons with the rigorous nonlocal boundary condition indicate that the simple boundary condition gives accurate solutions if the computational domain is enlarged by a few lattice constants in each direction.

© 2012 Optical Society of America

OCIS Codes
(000.4430) General : Numerical approximation and analysis
(050.1755) Diffraction and gratings : Computational electromagnetic methods
(130.5296) Integrated optics : Photonic crystal waveguides
(050.5298) Diffraction and gratings : Photonic crystals

ToC Category:
Diffraction and Gratings

History
Original Manuscript: January 23, 2012
Revised Manuscript: March 28, 2012
Manuscript Accepted: March 28, 2012
Published: May 22, 2012

Citation
Zhen Hu and Ya Yan Lu, "Simple boundary condition for terminating photonic crystal waveguides," J. Opt. Soc. Am. B 29, 1356-1360 (2012)
http://www.opticsinfobase.org/josab/abstract.cfm?URI=josab-29-6-1356


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