Effects of disorder on the frequency and field of photonic-crystal cavity resonators

C. J. Matthews, R. Seviour

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

In recent years the application of 2-Dimensional (2D) metallic Photonic-Crystal (PC) structures to high-power microwave devices, such as particle accelerators and gyrotrons, has gained increased interest. In this paper we focus on the effect disorder has on the resonant frequency and peak electric field in the defect site of a 2D PC structure. For disorders up to a maximum of 15% variation in position and radius, we found that disorder applied to the innermost rods surrounding the defect site dominates in determining the peak field and resonant frequency of the structure. We also show that small disorder (1%) can lead to an increase in peak field in certain cases due to structure optimization. We find that increasing levels of disorder lead to a decreasing average peak field for all structures. Whereas the mean resonant frequency remains constant for increasing disorder while the standard deviation increases. We then develop an understanding for this behaviour in terms of frequency detuning and mode confinement.

Original languageEnglish
Pages (from-to)381-388
Number of pages8
JournalApplied Physics B: Lasers and Optics
Volume94
Issue number3
Early online date29 Nov 2008
DOIs
Publication statusPublished - Mar 2009
Externally publishedYes

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