The electro-magnetic field generated within and around dissipative nano-structures upon light radiation is intimately associated to the formation of localized heat sources. In turn, this phenomenon determines localized temperature variations, effect which can be exploited for applications such as photocatalysis , nanochemistry  or sensor devices .
Here we show how the geometrical characteristics of plasmonic nano-structures can indeed be used to modulate the temperature response. The idea is that when metallic structures interact with an electromagnetic field they heat up due to Joule effect. The corresponding temperature variation modifies the optical response of the structure [4,5] and thus its heating process. The key finding is that, depending on the structures geometry, absorption efficiency can either increase or decrease with temperature. Since absorption relates to the thermal energy dissipation and thus to temperature increase, the mechanism leads to positive or negative loops. Consequently, not only an error would be made by neglecting the role of temperature, but it would be not even possible to know, a priori, if the error is towards higher or lower absorption values.
Our model can be utilized to study opto-thermal phenomena when high temperature or high intensity sources are employed.
 M. Honda et al., Appl. Phys. Lett. 104, 061108 (2014)
 G. Baffou et al., Chem. Soc. Rev. 43, 3898 (2014)
 S. Ozdemir et al., J. Lightwave Tech. 21, 805 (2003)
 A. Alabastri et al., ACS Photonics 2, 115 (2015)
 A. Alabastri et al., Materials 6, 4879 (2013)
Alessandro Alabastri, Mario Malerba, Eugenio Calandrini, Andrea Toma, and Remo Proietti Zaccaria, "Thermo-plasmonics: playing with temperature at the nanoscale (Conference Presentation)," Proc. SPIE 10102, Ultrafast Phenomena and Nanophotonics XXI, 101020M (Presented at SPIE OPTO: January 31, 2017; Published: 19 April 2017); https://doi.org/10.1117/12.2255598.5391659166001.
Conference Presentations are recordings of oral presentations given at SPIE conferences and published as part of the conference proceedings. They include the speaker's narration along with a video recording of the presentation slides and animations. Many conference presentations also include full-text papers. Search and browse our growing collection of more than 12,000 conference presentations, including many plenary and keynote presentations.