[19p-S622-1~16] 3.12 Nanoscale optical science and near-field optics

[19p-S622-15] Observation of one dimensional SERS hot spots of single silver nanowire dimers

〇Tamitake Itoh¹, Yuko S. Yamamoto^2,3, Shin-ichi Wakida¹, Balachandran Jeyadevan⁴ (1.AIST, 2.JSPS RPD, 3.Kagawa Univ., 4.Univ. Shiga Pref.)

Keywords:silver nanowire,surface enhanced Raman scattering,plasmon resonance

Mode volume at the gaps of gold and silver nanoparticle dimers becomes around 1 nm³, enabling us observing fluctuations and structual changes of single molecules. The phenomenon is called surface enhanced Raman scattering (SERS) and the gap is called a "hotspot". However the possibility of proper adsorption of molecules at a hotspot is low. Thus, there is a problem that ultrahigh sensitivity of SERS is not used efficiently. A hotspot at the gap of a nanowire dimer can resolved the problem because the hotspot is one dimensional and thus the possibility of proper adsorption is expected to be improved. We report the observion of one dimensional SERS hotspots in aggregates of nanowire in the presentation.