Scattering and extinction from high-aspect-ratio trenches

Alexander Sylvester Roberts; Thomas Søndergaard; Manohar Chirumamilla; Anders Lambertus Pors; Jonas Beermann; Kjeld Pedersen; Sergey I. Bozhevolnyi

Scattering and extinction from high-aspect-ratio trenches

Alexander Sylvester Roberts, Thomas Søndergaard, Manohar Chirumamilla, Anders Lambertus Pors, Jonas Beermann, Kjeld Pedersen, Sergey I. Bozhevolnyi

Department of Technology and Innovation

Aalborg University

Research output: Contribution to conference without publisher/journal › Poster › Research

Abstract

We construct a semi-analytical model describing the scattering, extinction and absorption properties of a high aspect-ratio trench in a metallic film. We find that these trenches act as highly efficient scatterers of free waves. In the perfect conductor limit, which for many metals is approached in the long-wavelength regime, the scattering cross section has the maximum value for a dipolar scatterer, which depends exclusively on the wavelength. Numerical simulations are performed to validate model findings and evaluate under which circumstances the model is accurate.
We fabricate tapered high aspect-ratio trenches of various depths into a gold monocrystal, which we characterize by reflection spectroscopy and dark field imaging, confirming their resonantbehavior. Furthermore, we estimate the field enhancement by means of two-photonluminescence.

Original language	English
Publication date	19. Nov 2015
Number of pages	1
Publication status	Published - 19. Nov 2015

Cite this

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title = "Scattering and extinction from high-aspect-ratio trenches",

abstract = "We construct a semi-analytical model describing the scattering, extinction and absorption properties of a high aspect-ratio trench in a metallic film. We find that these trenches act as highly efficient scatterers of free waves. In the perfect conductor limit, which for many metals is approached in the long-wavelength regime, the scattering cross section has the maximum value for a dipolar scatterer, which depends exclusively on the wavelength. Numerical simulations are performed to validate model findings and evaluate under which circumstances the model is accurate.We fabricate tapered high aspect-ratio trenches of various depths into a gold monocrystal, which we characterize by reflection spectroscopy and dark field imaging, confirming their resonantbehavior. Furthermore, we estimate the field enhancement by means of two-photonluminescence.",

author = "Roberts, {Alexander Sylvester} and Thomas S{\o}ndergaard and Manohar Chirumamilla and Pors, {Anders Lambertus} and Jonas Beermann and Kjeld Pedersen and Bozhevolnyi, {Sergey I.}",

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T1 - Scattering and extinction from high-aspect-ratio trenches

AU - Roberts, Alexander Sylvester

AU - Søndergaard, Thomas

AU - Chirumamilla, Manohar

AU - Pors, Anders Lambertus

AU - Beermann, Jonas

AU - Pedersen, Kjeld

AU - Bozhevolnyi, Sergey I.

PY - 2015/11/19

Y1 - 2015/11/19

N2 - We construct a semi-analytical model describing the scattering, extinction and absorption properties of a high aspect-ratio trench in a metallic film. We find that these trenches act as highly efficient scatterers of free waves. In the perfect conductor limit, which for many metals is approached in the long-wavelength regime, the scattering cross section has the maximum value for a dipolar scatterer, which depends exclusively on the wavelength. Numerical simulations are performed to validate model findings and evaluate under which circumstances the model is accurate.We fabricate tapered high aspect-ratio trenches of various depths into a gold monocrystal, which we characterize by reflection spectroscopy and dark field imaging, confirming their resonantbehavior. Furthermore, we estimate the field enhancement by means of two-photonluminescence.

AB - We construct a semi-analytical model describing the scattering, extinction and absorption properties of a high aspect-ratio trench in a metallic film. We find that these trenches act as highly efficient scatterers of free waves. In the perfect conductor limit, which for many metals is approached in the long-wavelength regime, the scattering cross section has the maximum value for a dipolar scatterer, which depends exclusively on the wavelength. Numerical simulations are performed to validate model findings and evaluate under which circumstances the model is accurate.We fabricate tapered high aspect-ratio trenches of various depths into a gold monocrystal, which we characterize by reflection spectroscopy and dark field imaging, confirming their resonantbehavior. Furthermore, we estimate the field enhancement by means of two-photonluminescence.

M3 - Poster

ER -

Scattering and extinction from high-aspect-ratio trenches

Abstract

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