Iterative perturbation scheme for morphology-dependent resonances in dielectric spheres
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摘要The properties of morphology-dependent resonances observed in the scattering of electromagnetic waves from dielectric spheres have recently been investigated intensively, and a second-order perturbative expansion for these resonances has also been derived. Nevertheless, it is still desirable to obtain higher-order corrections to their eigenfrequencies, which will become important for strong enough perturbations. Conventional explicit expressions for higher-order corrections inevitably involve multiple sums over intermediate states, which are computationally cumbersome. In this analysis an efficient iterative scheme is developed to evaluate the higher-order perturbation results. This scheme, together with the optimal truncation rule and the Pade resummation, yields accurate numerical results for eigenfrequencies of morphology-dependent resonances even if the dielectric sphere in consideration deviates strongly from a uniform one. Iris also interesting to find that a spatial discontinuity in the refractive index, say, at the edge of the dielectric sphere, is crucial to the validity of the perturbative expansion. (C) 1998 Optical Society of America.
著者Lee KM, Leung PT, Pang KM
期刊名稱JOURNAL OF THE OPTICAL SOCIETY OF AMERICA A-OPTICS IMAGE SCIENCE AND VISION
出版年份1998
月份5
日期1
卷號15
期次5
出版社OPTICAL SOC AMER
頁次1383 - 1393
國際標準期刊號0740-3232
語言英式英語
Web of Science 學科類別Optics; OPTICS

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