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Dilation of nanonatennas induced by an electromagnetic source

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Author(s): Dominique Barchiesi | Eric Kremer | Abel Cherouat | Thomas Grosges | Houman Borouchaki

Journal: Advanced Electromagnetics
ISSN 2119-0275

Volume: 1;
Issue: 2;
Start page: 48;
Date: 2012;
Original page

Keywords: nanoantenna | temperature | photo-induced dilation

ABSTRACT
The illumination of plasmonic mesostructures produces high confinement of light in their vicinity. This confinement of light can be enhanced in the gap between the two metallic nanorods of a nanonantenna, in particular for the design of biosensors. The nanometric gap can be reduced if the elevation of temperature of the nanonantenna is sufficient, and therefore the fine tuning of the sensor requires the description of the photo-thermal induced dilation. The multiphysics problem associated to such photo-thermal and mechanical effects is modeled through a Finite Element Method (FEM). The problem consists in computing the electromagnetic field, the temperature and the induced dilation surface. This contribution consists in discussing the numerical efficiencies of a sequential, and a coupled approaches, especially in terms of adaptive meshing of the space of computation. The relationship between the field enhancement and the reduction of the gap is studied. Finally the validity of the 2D multiphysic model is discussed.
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