Interplay of hot electrons from localized and propagating plasmons

Hiroaki Misawa, Keisuke Goda, Kosei Ueno, Zhenzhou Cheng, Quan Sun, Xu Shi, Allison Giles, Naoki Gorai, Yasuo Ito, Koki Hayashi, Chung Vu Hoang

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

Plasmon-induced hot-electron generation has recently received considerable interest and has been studied to develop novel applications in optoelectronics, photovoltaics and green chemistry. Such hot electrons are typically generated from either localized plasmons in metal nanoparticles or propagating plasmons in patterned metal nanostructures. Here we simultaneously generate these heterogeneous plasmon-induced hot electrons and exploit their cooperative interplay in a single metal-semiconductor device to demonstrate, as an example, wavelength-controlled polarity-switchable photoconductivity. Specifically, the dual-plasmon device produces a net photocurrent whose polarity is determined by the balance in population and directionality between the hot electrons from localized and propagating plasmons. The current responsivity and polarity-switching wavelength of the device can be varied over the entire visible spectrum by tailoring the hot-electron interplay in various ways. This phenomenon may provide flexibility to manipulate the electrical output from light-matter interaction and offer opportunities for biosensors, long-distance communications, and photoconversion applications.
Original languageEnglish
Article number771
JournalNature Communications
Volume8
DOIs
StatePublished - 3 Oct 2017

Keywords

  • ENHANCED RAMAN-SCATTERING; PHOTOCURRENT GENERATION; METAL NANOPARTICLES; GOLD NANOPARTICLES; SURFACE-PLASMONS; OPTICAL ANTENNAS; NANOSTRUCTURES; FILMS; PHOTODETECTION; PHOTOEMISSION

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    Misawa, H., Goda, K., Ueno, K., Cheng, Z., Sun, Q., Shi, X., Giles, A., Gorai, N., Ito, Y., Hayashi, K., & Hoang, C. V. (2017). Interplay of hot electrons from localized and propagating plasmons. Nature Communications, 8, [771]. https://doi.org/10.1038/s41467-017-00815-x