Rik Harbers et al 2006 J. Opt. A: Pure Appl. Opt. 8 S273 doi:10.1088/1464-4258/8/4/S29
Rik Harbers1,2, Patric Strasser3, Daniele Caimi2, Rainer F Mahrt2, Nikolaj Moll2, Daniel Erni1, Werner Bächtold1, Bert Jan Offrein2 and Ullrich Scherf4
Show affiliationsPhotonic-crystal lasers whose feedback is enhanced by a thin layer of titanium dioxide (TiO2) have been experimentally investigated. The use of TiO2 increases the index contrast in the photonic crystal as well as the confinement in the waveguide, resulting in larger feedback of the lasing modes. This allows lower thresholds and much smaller devices. Vertically emitting laser devices, using the methyl-substituted ladder-type poly(p-phenylene) (MeLPPP) as gain material, have been fabricated according to optimized parameters, and the measured dispersion relation of the structures matches excellently with simulations. The devices feature a three to five times lower threshold than devices whose feedback structure is etched directly into the fused silica substrate.
42.55.Tv Photonic crystal lasers and coherent effects
Soft matter, liquids and polymers
Issue 4 (April 2006)
Received 10 October 2005, accepted for publication 11 January 2006
Published 27 March 2006
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