title: Enhancing surface plasmon resonances of metallic nanoparticles by diatom biosilica.
abstract: Diatoms are single-celled algaes that make photonic-crystal-like silica shells or frustules with hierarchical micro- & nano-scale features consisting of two-dimensional periodic pores. This article reports the use of diatom frustules as an integration platform to enhance localized surface plasmon resonances of self-assembled silver nanoparticles (NPs) on the surface of diatom frustules. Theoretical and experimental results show enhanced localized surface plasmons due to the coupling with the guided-mode resonances of the frustules. We observed 2 × stronger optical extinction and over 4 × higher sensitivity of surface-enhanced Raman scattering of Rhodmine 6G from the NPs-on-diatom than the NPs-on-glass structure.
authors.affiliation: School of Electrical Engineering and Computer Science, Oregon State University, Corvallis, OR 97331, USA.
authors.forename: Fanghui
authors.initials: F
authors.lastname: Ren
authors.forename: Jeremy
authors.initials: J
authors.lastname: Campbell
authors.forename: Xiangyu
authors.initials: X
authors.lastname: Wang
authors.forename: Gregory L
authors.initials: GL
authors.lastname: Rorrer
authors.forename: Alan X
authors.initials: AX
authors.lastname: Wang
mesh_terms: D017377:Diatoms / Q000737:chemistry* / Q000648:ultrastructure; D053768:Metal Nanoparticles / Q000737:chemistry* / Q000648:ultrastructure; D012822:Silicon Dioxide / Q000737:chemistry*; D012834:Silver / Q000737:chemistry; D013050:Spectrometry, Fluorescence; D020349:Surface Plasmon Resonance
chemical_list: D012834:Silver; D012822:Silicon Dioxide