报告题目：Strong Vibrational Coupling in Plasmonic Resonators
报告人：国家杰出青年科学基金获得者、深圳大学微纳光电子学研究院执行院长汪国平教授
报告时间：2019年9月6日14:30
报告地点：物理楼213会议室
内容提要：Vibrating plasmonic nanoparticles generate two types of acoustic waves. One is the localized acoustic vibrations of the metal nanoparticle itself, which give fundamental insight into the mechanical properties of the particle. The other is propagating picosecond acoustic waves in the surrounding medium, which are experiencing increasing applications in biology and materials science. Femtosecond laser spectroscopy in a pump-probe scheme offers a unique way of directly observing these two types of phonons in the time domain by judicious choice of the probe wavelength. In this talk, we will discuss these two types of acoustic waves generated from single plasmonic resonators. The high frequency acoustic vibrations (up to 100 GHz) inherent to these plasmonic resonators enabled us to study the solvent dynamics. We’ve discovered the outgoing picosecond acoustic waves damp the mechanical vibrations of plasmonic resonators. Blocking the phonon decay pathway, we improved the vibrational quality factors of metallic resonators by an order of magnitude which enabled us to observe strong vibrational coupling in purely plasmonic nanoresonators. Our results provided a new platform for future observation and control of the quantum behavior of phonon modes in metallic nanoparticles.
