High precision measurements of temperature dependent optical constants for simulation-based optimisation of plasmonic behaviour at the nanoscale

Giulia di Fazio; Silas O'Toole; Dominic Zerulla

doi:10.1117/12.3016755

10 June 2024 High precision measurements of temperature dependent optical constants for simulation-based optimisation of plasmonic behaviour at the nanoscale

Giulia di Fazio, Silas O'Toole, Dominic Zerulla

Author Affiliations +

Proceedings Volume 12991, Nanophotonics X; 129910G (2024) https://doi.org/10.1117/12.3016755
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

The capability to actively control the formation of Surface Plasmon Polaritons (SPPs) by means of temperature changes is one of the base working principles for active plasmonic devices, sensors and imaging systems. In order to exploit this idea, it is necessary to have a very in-depth knowledge of the changes induced by heating in the optical properties of plasmonic materials in real operational conditions. Previous studies have tracked the influence of temperature on plasmonic materials’ refractive indices, but data are usually acquired with large temperature steps (≈ 100°C - 300°C), and don’t always focus on extracting a precise relationship between optical constants and temperature in non-ideal environments, assuming the a very high purity of the materials involved and a controlled atmosphere. This research aims to fill the gap in the existing literature by means of a systematic approach, involving both a temperature-controlled Surface Plasmon Resonance (SPR) acquisition setup capable of 1◦C steps and a computational approach to fit data and explain changes in the optical properties. To verify the influence of temperature changes on the localisation of the electric field itself, Finite Element Method (FEM) simulations using COMSOL Multiphysics are conducted. These simulations highlight the differences in systems at different temperatures in terms of electromagnetic field distribution.

Conference Presentation

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Giulia di Fazio, Silas O'Toole, and Dominic Zerulla "High precision measurements of temperature dependent optical constants for simulation-based optimisation of plasmonic behaviour at the nanoscale", Proc. SPIE 12991, Nanophotonics X, 129910G (10 June 2024); https://doi.org/10.1117/12.3016755

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