Surface-enhanced Raman scattering of crystal violets from periodic array of gold nanocylinders

• Published in: Journal of modern optics Vol. 61; no. 15; pp. 1231 - 1235
• Main Authors: Bi, Gang, Wang, Li, Cai, Chunfeng, Ueno, Kosei, Misawa, Hiroaki, Qiu, Jianrong
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 02.09.2014; Taylor & Francis Ltd
• Subjects: Arrays; crystal violet molecules; Crystals; electron-beam lithography and lift-off techniques; Excitation; Gold; Mathematical analysis; Molecules; Nanocrystals; Nanostructure; Optics; periodic gold nanocylinders; Raman scattering; Scattering; surface-enhanced Raman scattering; Wavelengths
• ISSN: 0950-0340; 1362-3044
• DOI: 10.1080/09500340.2014.928378

The periodic arrays of gold nanocylinder with 121 nm in diameter, 6.3 nm in gap, and 34 nm in thickness are fabricated on glass by electron-beam lithography and lift-off techniques. Some crystal violet molecules are coated on the array by using the dipping and drawing method. In addition, the surface-enhanced Raman scattering (SERS) spectra of these samples with and without gold nanocylinder arrays are characterized specifically. The largest enhancement factor is obtained when the excitation wavelength corresponds to the peak wavelength of localized surface plasmon resonance (LSPR). The density functional theory and the finite-difference time-domain method are used for the calculations of the extinction spectrum of the arrays and Raman spectra of the crystal violet, respectively. These results unambiguously demonstrate that the periodic arrays of gold nanocylinder have good and effective surface-enhanced properties for Raman scattering of crystal violets, and they also show that the excitation wavelength corresponding to the peak one of the LSPR is one of the major reasons causing SERS.