Effects of disorder on the frequency and field of photonic-crystal cavity resonators |
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Authors: | C J Matthews and R Seviour |
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Institution: | (1) Department of Physics, Lancaster University, Lancaster, LA1 4YB, UK |
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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. |
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Keywords: | PACS" target="_blank">PACS 42 70 Qs 41 20 Jb 02 70 Dh |
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