Low-reflection photonic-crystal taper for efficient coupling between guide sections of arbitrary widths

Anne Talneau (1) , Philippe Lalanne (2) , Mario Agio (3) , Costas M. Soukoulis (4)

1 LPN - Laboratoire de photonique et de nanostructures
2 Laboratoire Charles Fabry de l'Institut d'Optique / Naphel
3 INFM-Dipartimento di Fisica
4 ICS-FORTH - Institute of Computer Science [FORTH, Heraklion]

We design and fabricate a new taper structure for adiabatic mode transformation in two-dimensional photonic-crystal waveguides patterned into a GaInAsP confining layer. The taper efficiency is validated by measurement of a reduction of the reflection between an access ridge and a photonic-crystal guide with one missing row from 6% to less than 1%. This taper is then incorporated into a 60° bend; simulations demonstrate a 90% transmission between multimode ports.

Domains: Physics [physics]; Physics [physics]; Optics [physics.optics]

Anne Talneau, Philippe Lalanne, Mario Agio, Costas M. Soukoulis. Low-reflection photonic-crystal taper for efficient coupling between guide sections of arbitrary widths. Optics Letters, 2002, 27 (17), pp.1522-1524. ⟨10.1364/OL.27.001522⟩. ⟨hal-00874519⟩