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Article Dans Une Revue ACS photonics Année : 2019

Temperature Measurement in Plasmonic Nanoapertures Used for Optical Trapping

Quanbo Jiang
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Benoit Rogez
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Jean-Benoît Claude
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Guillaume Baffou
Jérôme Wenger

Résumé

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/µm² 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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Dates et versions

hal-02196575 , version 1 (29-07-2019)

Identifiants

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Quanbo Jiang, Benoit Rogez, Jean-Benoît Claude, Guillaume Baffou, Jérôme Wenger. Temperature Measurement in Plasmonic Nanoapertures Used for Optical Trapping. ACS photonics, 2019, 6 (7), pp.1763-1773. ⟨10.1021/acsphotonics.9b00519⟩. ⟨hal-02196575⟩
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