Temporal Coupled-Mode Theory for Fano Resonance in Light Scattering by a Single Obstacle

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• 作者：Zhichao Ruan ; Shanhui Fan
• 刊名：Journal of Physical Chemistry C
• 出版年：2010
• 出版时间：April 29, 2010
• 年：2010
• 卷：114
• 期：16
• 页码：7324-7329
• 全文大小：204K
• 年卷期：v.114,no.16(April 29, 2010)
• ISSN：1932-7455

文摘

We present a theory for Fano interference in light scattering by individual obstacle, based on a temporal coupled-mode formalism. This theory is applicable for obstacles that are much smaller than the incident wavelength, or for systems with two-dimensional cylindrical or three-dimensional spherical symmetry. We show that for each angle momentum channel, the Fano interference effect can be modeled by a simple temporal coupled-mode equation, which provides a line shape formula for scattering and absorption cross-section. We validate the analysis with numerical simulations. As an application of the theory, we design a structure that exhibits strong absorption and weak scattering properties at the same frequency.