Title :
Surface-Enhanced Raman Spectroscopy Sensors From Nanobiosilica With Self-Assembled Plasmonic Nanoparticles
Author :
Fanghui Ren ; Campbell, Joe ; Rorrer, Gregory L. ; Wang, Alan X.
Author_Institution :
Oregon State Univ., Corvallis, OR, USA
Abstract :
We present an innovative surface-enhanced Raman spectroscopy (SERS) sensor based on a biological-plasmonic hybrid nanostructure by self-assembling silver (Ag) nanoparticles into diatom frustules. The photonic-crystal-like diatom frustules provide a spatially confined electric field with enhanced intensity that can form hybrid photonic-plasmonic modes through the optical coupling with Ag nanoparticles. The experimental results demonstrate 4-6× and 9-12× improvement of sensitivities to detect the Raman dye for resonance and nonresonance SERS sensing, respectively. Such low-cost and high-sensitivity SERS sensors have significant potentials for label-free biosensing.
Keywords :
chemical sensors; dyes; nanobiotechnology; nanoparticles; nanophotonics; nanosensors; optical sensors; photonic crystals; plasmonics; self-assembly; silicon compounds; silver; surface enhanced Raman scattering; Ag-SiO2; Raman dye; biological-plasmonic hybrid nanostructure; hybrid photonic-plasmonic modes; label-free biosensing; nanobiosilica; nonresonance SERS sensing; optical coupling; photonic-crystal-like diatom frustules; resonance SERS sensing; self-assembled plasmonic nanoparticles; self-assembling silver nanoparticles; spatially confined electric field; surface-enhanced Raman spectroscopy sensor; Glass; Nanobioscience; Photonic crystals; Plasmons; Raman scattering; Sensors; Substrates; Diatom frustules; photonic crystals; surface plasmons; surface-enhanced Raman spectroscopy;
Journal_Title :
Selected Topics in Quantum Electronics, IEEE Journal of
DOI :
10.1109/JSTQE.2014.2301016