Berlin 2005 – wissenschaftliches Programm

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HL: Halbleiterphysik

HL 49: Photonische Kristalle II

HL 49.3: Vortrag

Dienstag, 8. März 2005, 11:15–11:30, TU P164

Coupled Resonator Optical Waveguides (CROWs) Doped With Nanocrystals — •Björn M. Möller¹, Mikhail V. Artemyev², Reinhold Wannemacher³, and Ulrike Woggon¹ — ¹University of Dortmund — ²Belarussian State University, Minsk — ³Universität Leipzig

In this contribution, we study CdSe-doped microspheres of radii between two and four optical wavelengths as building blocks for coupled resonator optical waveguides (CROWs) [1]. Unlike other types of optical waveguides, waveguiding through CROWs is achieved through weak coupling between otherwise localized high-Q optical cavities. The coherently coupled microsphere cavities were prepared by impregnating polystyrene microspheres with a subsurface layer of CdSe nanocrystals [2]. Exactly size-matched microspheres (< 0.1 % size deviation) have been pre-selected via their Mie resonances. The coupled cavities, arranged in linear chains and various two-dimensional geometries are studied by microphotoluminescence spectroscopy and polarization sensitive mode mapping [3]. Waveguides consisting of more than five coherently coupled cavities with radii around 2.25 µm have been achieved.

The financial commitment of the DFG (SPP 1113 - Photonic Crystals) is gratefully acknowledged.

[1] A. Yariv, et al., Opt. Lett. 24, 711 (1999)

[2] U. Woggon et al., J. Appl. Phys. B 77 (5), 469 (2003)

[3] B. M. Möller et al., Phys. Rev. B 70 (11), 115323 (2004)