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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 19, Iss. 4 — Feb. 14, 2011
  • pp: 3063–3076

Polarization-insensitive subwavelength sharp bends in asymmetric metal/multi-insulator configuration

Yin-Jung Chang and You-Chang Liu  »View Author Affiliations


Optics Express, Vol. 19, Issue 4, pp. 3063-3076 (2011)
http://dx.doi.org/10.1364/OE.19.003063


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Abstract

A new silicon-based sharp waveguide bend in asymmetric metal/multi-insulator configuration is described. TE and TM modes are calculated rigorously electromagnetically from which the general design rules are derived. Numerical simulations show that the respective insertion losses of < 0.085 dB and < 0.229 dB for TE and TM modes can be achieved by introducing a low-index layer between the metal and high-index core. The bending length is determined by the TE mode and has much smaller impacts on the TM that exhibits no resonance-like behavior as does the TE. The combined TE modal and radiation power in the air region is shown to couple back to the Si core through an asymmetric output taper, yielding a high transmission efficiency. Structure-enabled successive photonic-plamsonic mode conversions are shown to increase the TM mode confinement in the high-index core while the plasmonic mode carries up to 42.6% of the input power along the bending section.

© 2011 Optical Society of America

OCIS Codes
(130.3120) Integrated optics : Integrated optics devices
(230.7370) Optical devices : Waveguides
(240.6680) Optics at surfaces : Surface plasmons
(250.5403) Optoelectronics : Plasmonics

ToC Category:
Integrated Optics

History
Original Manuscript: December 7, 2010
Revised Manuscript: January 27, 2011
Manuscript Accepted: January 27, 2011
Published: February 2, 2011

Citation
Yin-Jung Chang and You-Chang Liu, "Polarization-insensitive subwavelength sharp bends in asymmetric metal/multi-insulator configuration," Opt. Express 19, 3063-3076 (2011)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-19-4-3063


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