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arXiv · 1906.01947

Temperature Measurement in Plasmonic Nanoapertures used for Optical Trapping

Quanbo Jiang·Benoît Rogez·Jean-Benoît Claude·Guillaume Baffou·Jérôme Wenger
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Abstract

Plasmonic nanoapertures generate strong field gradients enabling efficient optical trapping of nano-objects. However, because the infrared laser used for trapping is also partly absorbed into the metal leading to Joule heating, plasmonic nano-optical tweezers face the issue of local temperature increase. Here, we develop three independent methods based on molecular fluorescence to quantify the temperature increase induced by a 1064 nm trapping beam focused on single and double nanoholes milled in gold films. We show that the temperature in the nanohole can be increased by 10°C even at the moderate intensities of 2 mW/$μ$m$^2$ used for nano-optical trapping. The temperature gain is found to be largely governed by the Ohmic losses into the metal layer, independently of the aperture size, double-nanohole gap or laser polarization. The techniques developed therein can be readily extended to other structures to improve our understanding of nano-optical tweezers and explore heat-controlled chemical reactions in nanoapertures.

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Quanbo Jiang, Benoît Rogez, Jean-Benoît Claude, Guillaume Baffou, Jérôme Wenger. 2019-06-05. Temperature Measurement in Plasmonic Nanoapertures used for Optical Trapping. https://arxiv.org/abs/1906.01947

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