Resonant secondary light emission from plasmonic Au nanostructures at high electron temperatures created by pulsed-laser excitation

Jingyu Huang; Wei Wang; Catherine J. MurphyDavid G. Cahill

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Resonant secondary light emission from plasmonic Au nanostructures at high electron temperatures created by pulsed-laser excitation

机译：Resonant secondary light emission from plasmonic Au nanostructures at high electron temperatures created by pulsed-laser excitation

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Plasmonic nanostructures are of great current interest as chemical sensors, in vivo imaging agents, and for photothermal therapeutics. We study continuous-wave (cw) and pulsed-laser excitation of aqueous suspensions of Au nanorods as a model system for secondary light emission from plasmonic nanostructures. Resonant secondary emission contributes significantly to the background commonly observed in surface-enhanced Raman scattering and to the light emission generated by pulsed-laser excitation of metallic nanostructures that is often attributed to two-photon luminescence. Spectra collected using cw laser excitation at 488 nm show an enhancement of the broad spectrum of emission at the electromagnetic plasmon resonance of the nanorods. The intensity of anti-Stokes emission collected using cw laser excitation at 785 nm is described by a 300 K thermal distribution of excitations. Excitation by subpicosecond laser pulses at 785 nm broadens and increases the intensity of the anti-Stokes emission in a manner that is consistent with electronic Raman scattering by a high-temperature distribution of electronic excitations predicted by a two-temperature model. Broadening of the pulse duration using an etalon reduces the intensity of anti-Stokes emission in quantitative agreement with the model. Experiments using a pair of subpicosecond optical pulses separated by a variable delay show that the timescale of resonant secondary emission is comparable to the timescale for equilibration of electrons and phonons.

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《Proceedings of the National Academy of Sciences of the United States of America》 |2014年第3期|906-911|共6页
作者
Jingyu Huang; Wei Wang; Catherine J. MurphyDavid G. Cahill;
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作者单位

Departments of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, IL 61801;

Departments of Chemistry, University of Illinois at Urbana-Champaign, Urbana, IL 61801;

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收录信息美国《科学引文索引》(SCI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
原文格式 PDF
正文语种英语
中图分类自然科学总论;
关键词
gold nanorods; electron-hole pairs; surface-enhanced Raman scattering background;

Resonant secondary light emission from plasmonic Au nanostructures at high electron temperatures created by pulsed-laser excitation

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