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Applied Optics

Applied Optics


  • Editor: James C. Wyant
  • Vol. 45, Iss. 8 — Mar. 10, 2006
  • pp: 1831–1838

Micro-optically assisted high-index waveguide coupling

Dirk Michaelis, Christoph Wächter, Sven Burger, Lin Zschiedrich, and Andreas Bräuer  »View Author Affiliations

Applied Optics, Vol. 45, Issue 8, pp. 1831-1838 (2006)

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Adapting the concept of solid immersion lenses, we numerically study a micro-optical scheme for conventional high-index and photonic-crystal waveguide coupling by using a combination of different numerical methods such as ray tracing, angular-spectrum propagation, finite-difference time-domain simulations, and finite-element-method simulations. The numerical findings are discussed by means of impedance, group- or energy-velocity, spot-size, and phase-matching criteria. When fabrication constraints for high-index immersion lenses made of silicon are taken into account, a coupling efficiency of 80 % can be reached for monomode silicon-on-insulator waveguides with a quadratic cross section of the core and rectangular cross sections of moderate aspect ratio. Similar coupling efficiencies of 80 % can be obtained for silicon-on-insulator photonic-crystal waveguides. Tolerances that are due to misalignments and variations of the substrate thickness of the silicon lens are discussed.

© 2006 Optical Society of America

OCIS Codes
(130.2790) Integrated optics : Guided waves
(220.3620) Optical design and fabrication : Lens system design
(350.3950) Other areas of optics : Micro-optics

ToC Category:
Other Areas of Optics

Original Manuscript: January 31, 2005
Revised Manuscript: September 5, 2005
Manuscript Accepted: September 26, 2005

Dirk Michaelis, Christoph Wächter, Sven Burger, Lin Zschiedrich, and Andreas Bräuer, "Micro-optically assisted high-index waveguide coupling," Appl. Opt. 45, 1831-1838 (2006)

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