physica status solidi (b)
© WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
Editor: Stefan Hildebrandt (Editor-in-Chief), Sabine Bahrs (Deputy Editor)
Online ISSN: 1521-3951
Back Cover: Whispering gallery modes in deformed hexagonal resonators (Phys. Status Solidi B 5/2012)
A hundred years ago Lord Rayleigh discussed the phenomenon of (acoustic) whispering gallery modes in St. Paul's cathedral. Today high quality optical resonators based on whispering gallery modes are an essential element in nanophotonics. Prismatic zinc oxide microwires with different polygonal circumference varying from the typically discussed regular hexagon have been investigated. Various whispering gallery modes (triangular, square and hexagonal) have been identified by their characteristic resonance spectra. Also Fabry-Pérot modes within the wire cross-section have been found, unambiguously distinguished by their particular angular dispersion. The bending of nanowires leads to a reduction of symmetry, evidenced by local variation of band gap, and leaves some whispering gallery modes intact. Thus the study of whispering gallery modes remains an active field with applications in nano- and micro-sized optical devices lying ahead. For further details see the Feature Article by Grundmann and Dietrich on pp. 871–879.