1 May 2014 Simulating the response of nanostructures under a focused beam
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Focusing the light onto nanostructures thanks to spherical lenses is a first step to enhance the field, and is widely used in applications needing strong light matter interactions. Nonetheless, the electromagnetic response of such nanostructures, which have subwavelength patterns, to a focused beam can not be described by classical optics. Here, we describe a formalism to efficiently compute the behavior of nanostructures under a focused beam based on an apodized decomposition on plane waves. Besides, each computation of a plane wave is done on only one period thanks to a conical B-spline modal method. Various examples illustrating the focusing are detailed, and in particular the possibility to move the focal spot and to tilt the focus beam.
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Paul Chevalier, Paul Chevalier, Patrick Bouchon, Patrick Bouchon, Riad Haïdar, Riad Haïdar, Fabrice Pardo, Fabrice Pardo, "Simulating the response of nanostructures under a focused beam", Proc. SPIE 9131, Optical Modelling and Design III, 913111 (1 May 2014); doi: 10.1117/12.2052603; https://doi.org/10.1117/12.2052603

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