Light absorption in conical silicon particles

J Bogdanowicz,W Vandervorst,S Koelling,M Gilbert,B Vanderheyden,N Innocenti

doi:10.1364/oe.21.003891

J Bogdanowicz, W Vandervorst + Show 4 more

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https://doi.org/10.1364/oe.21.003891

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Abstract

The problem of the absorption of light by a nanoscale dielectric cone is discussed. A simplified solution based on the analytical Mie theory of scattering and absorption by cylindrical objects is proposed and supported by the experimental observation of sharply localized holes in conical silicon tips after high-fluence irradiation. This study reveals that light couples with tapered objects dominantly at specific locations, where the local radius corresponds to one of the resonant radii of a cylindrical object, as predicted by Mie theory.

Highlights

A simplified solution based on the analytical Mie theory of scattering and absorption by cylindrical objects is proposed and supported by the experimental observation of sharply localized holes in conical silicon tips after high-fluence irradiation
This study reveals that light couples with tapered objects dominantly at specific locations, where the local radius corresponds to one of the resonant radii of a cylindrical object, as predicted by Mie theory
We have developed a simplified light-absorption theory for conical nanoparticles based on the assumption that an axisymmetric particle is a stack of cylinders with varying radius. This theory predicts that light couples and is absorbed in these objects at specific locations, where the local radius corresponds to a resonance of the Mie theory developed for cylindrical particles

Summary

Introduction

A simplified solution based on the analytical Mie theory of scattering and absorption by cylindrical objects is proposed and supported by the experimental observation of sharply localized holes in conical silicon tips after high-fluence irradiation. Focusing our study on the case of a conical particle, we deduce theoretically and show experimentally that the absorption of light occurs preferentially at specific locations on the particle, where the local radius corresponds to one of the resonance absorption/scattering radii of an illuminated cylinder at the considered wavelength.

Results

Conclusion