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Thermal detection of surface plasmons on gold nanohole arrays |
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| Authors: | Wei Zhang ZhiPeng Li ZhiQiang Guan Hao Shen WenBo Yu WeiDong He XiaoPeng Yan Ping Li HongXing Xu |
| Affiliation: | National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China; 2 Beijing Key Laboratory of Nano-Photonics and Nano-Structure(NPNS),Department of Physics,Capital Normal University,Beijing 100048, China; 3 Information Awareness and Confrontation,Beijing Institute of Technology,Beijing 100081,China; 4 Division of Solid State Physics,Lund University,Lund 22100,Sweden |
| Abstract: | We used a thin-film thermocouple to detect the thermal effect of surface plasmons excited in Au nanohole array structures. We found that the thermal electromotive force of Au film with periodic nanohole structures is three times greater than that of a bare Au film for 785-nm laser excitation at a given power. This effect is caused by the resonant excitation of localized surface plasmons in the nanoholes. In addition, we found that the thermal electromotive force (EMF) of the Au film with dumbbell-like nanohole arrays depends strongly on the incident polarization. The thermal EMF is the greatest when the excitation light is polarized perpendicular to the long axis of the dumbbell. |
| Keywords: | surface plasmons thermal effect thin film thermocouple periodic structure |
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