Optical trap-cavity ringdown spectroscopy as a single-aerosol-particle-scope

摘要

We report a single-aerosol-particle-scope using an optical trapping-cavity ringdown spectroscopy technique. The scope can not only view physical parameters such as size, motion, and restoring force constant of a single aerosol particle trapped in air but also display time-, particle-, or wavelength-resolved chemical properties such as single aerosol particle extinction. We demonstrate the scope by trapping and walking single carbon-nanotube particles of ～50 μm in size and viewing those properties via changes of ringdown time. This single-aerosol-particle-scope offers a powerful tool to study both physical and chemical properties as well as their evolving dynamics.