Zigzag Localized Surface Plasmon Resonance Wavelength Shift of Asymmetric V-Shape Ag Nanorods

Abstract

Asymmetry could significantly affect a nanoparticle’s localized surface plasmon resonance (LSPR) behaviors, although limited attention has been drawn on this fascinating phenomenon. In this work, asymmetry’s influence on the LSPR behaviors of V-shape Ag nanorods was systematically studied. The introduction of asymmetry generated a zigzag resonance wavelength shift pattern with alternative blue and red shifts. In the zigzag patterns, the number of bends proportionally increased with the order of resonance mode: from the first to the fifth mode, the patterns showed 0 to 4 bends, respectively. Moreover, wavelength extremums were always reached at certain asymmetry degrees of k/n, where n is the resonance order number and k is any integer from 1 to n – 1. Detailed explanations contributing to these phenomena were discussed at last, which might relate to the variation of pole distance and the corresponding energy fluctuation as the asymmetry degree changed.