Localized surface plasmon resonance of nanoporous gold

Xingyou Lang, Lihua Qian, Pengfei Guan, Jian Zi, Mingwei Chen

    Research output: Contribution to journalArticlepeer-review

    126 Citations (Scopus)

    Abstract

    We report the plasmonic properties of free-standing nanoporous gold (NPG) films with an intricate bicontinuous nanostructure. Two characteristic plasmon bands of NPG have been detected in absorption spectra. One at ∼490 nm, resulting from the resonant absorption of gold films, is independent of nanopore sizes and dielectric surroundings. The other at ∼550-650 nm, arising from the excitation of localized surface plasmon resonance, shows obvious band shift with the nanopore sizes and dielectric indices of surrounding media, suggesting that NPG is a promising candidate as plasmonic sensors for organic and biologic molecule detection. This study also shines light on the underlying mechanisms of surface enhanced spectroscopy of NPG.

    Original languageEnglish
    Article number093701
    JournalApplied Physics Letters
    Volume98
    Issue number9
    DOIs
    Publication statusPublished - 2011 Feb 28

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)

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