Physics – Optics
Scientific paper
2006-07-22
IEEE J. Select. Topics Quantum Electron. 12(6, part 1) 1175-1182 (2006)
Physics
Optics
8 pages with 13 figures (to appear in the Special Issue of JSTQE on Nanophotonics, 2006)
Scientific paper
Achieving single-mode operation and highly directional (preferably unidirectional) in-plane light output from whispering-gallery (WG) mode semiconductor microdisk resonators without seriously degrading the mode Q-factor challenges designers of low-threshold microlasers. To address this problem, basic design rules to tune the spectral and emission characteristics of micro-scale optical cavity structures with nanoscale features by tailoring their geometry are formulated and discussed in this paper. The validity and usefulness of these rules is demonstrated by reviewing a number of previously studied cavity shapes with global and local deformations. The rules provide leads to novel improved WG-mode cavity designs, two of which are presented: a cross-shaped photonic molecule with introduced asymmetry and a photonic-crystal-assisted microdisk resonator. Both these designs yield degenerate mode splitting, as well as Q-factor enhancement and directional light output of one of the split modes.
Benson Trevor M.
Boriskina Svetlana V.
Nosich Alexander I.
Sewell Phillip
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