Regensburg 2004 – scientific programme

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HL: Halbleiterphysik

HL 20: Photonische Kristalle IV

HL 20.8: Talk

Tuesday, March 9, 2004, 17:00–17:15, H17

Nanopillars photonic crystal waveguides — •Dmitry Chigrin, Andrei Lavrinenko, and Clivia Sotomayor Torres — Institute of Materials Science and Department of Electrical, Information and Media Engineering, University of Wuppertal, D-42097 Wuppertal, Germany

Photonic crystals (PhCs) are known for offering some new options to control the flow of light. PhC waveguide (PCW) is one example of PhCs application. In PCW, light confinement is due to a complete photonic bandgap. In this work, we present a novel type of PCW, which consists of a several rows of periodically placed dielectric cylinders. In such a structure, light confinement is due to the total internal reflection, while guided modes dispersion is strongly affected by waveguide periodicity.

A single row of periodically placed dielectric cylinders acts as a single mode waveguide. By adding new rows of cylinders, one transforms a single-row waveguide into a coupled waveguide array. Guided modes, a number of which is equal to the number of waveguide in the array, are bounded by lowest bands of infinite 2D PhC, possessing unique dispersion and being nearly equidistant.

In this work, factors playing the major role in tuning frequency positions and separation of guided modes are analyzed. The possibilities of the specific mode excitation and application of a nanopillars PCW as a laser cavity are discussed.