Temperature- and roughness- dependent permittivity of annealed/unannealed gold films

Po Ting Shen, Yonatan Sivan, Cheng Wei Lin, Hsiang Lin Liu, Chih Wei Chang, Shi Wei Chu

研究成果: 雜誌貢獻期刊論文同行評審

20 引文 斯高帕斯(Scopus)

摘要

Intrinsic absorption and subsequent heat generation have long been issues for metal-based plasmonics. Recently, thermo-plasmonics, which takes the advantage of such a thermal effect, is emerging as an important branch of plasmonics. However, although significant temperature increase is involved, characterization of metal permittivity at different temperatures and corresponding thermo-derivative are lacking. Here we measure gold permittivity from 300K to 570K, which the latter is enough for gold annealing. More than one order difference in thermo-derivative is revealed between annealed and unannealed films, resulting in a large variation of plasmonic properties. In addition, an unusual increase of imaginary permittivity after annealing is found. Both these effects can be attributed to the increased surface roughness incurred by annealing. Our results are valuable for characterizing extensively used unannealed nanoparticles, or annealed nanostructures, as building blocks in future thermo-nano-plasmonic systems.

原文英語
頁(從 - 到)19254-19263
頁數10
期刊Optics Express
24
發行號17
DOIs
出版狀態已發佈 - 2016 八月 22

ASJC Scopus subject areas

  • 原子與分子物理與光學

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