Interference-based wide-range dynamic tuning of the plasmonic color of single gold nanoparticles

Bokusui Nakayama, Takahito Nakabayashi, Keiko Esashika, Yuki Hiruta, Toshiharu Saiki

Research output: Contribution to journalArticlepeer-review


Dynamic tuning of nanoscale coloration by exploiting localized surface plasmon resonance of gold nanoparticles (AuNPs) combined with an interference coloration mechanism is demonstrated experimentally. When interference between the scattering field from AuNPs and the reflected field from the substrate is observed under back-scattering white-light microscopy, the AuNPs exhibit various colors depending on their distance to the substrate. When the numerical aperture of the microscope objective is optimized, much greater coverage of the color space than was achieved with previously reported plasmon-based approaches is attained. Also, color tunability is examined by exploiting the temperature-induced volume change of a temperature-responsive hydrogel with embedded AuNPs to dynamically modify the distance to the substrate.

Original languageEnglish
Pages (from-to)15001-15012
Number of pages12
JournalOptics Express
Issue number10
Publication statusPublished - 2021 May 10

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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