Abstract
We present an all-optical tool for the massive transfer of airborne light-absorbing particles. A generated light sheet trap can be used as an “optical mill” for guiding particles via photophoretic forces. We show the possibility of transferring hundreds to thousands of trapped particles from one cuvette to another in a controllable manner. Two different types of particles were used for demonstration—nonspherical agglomerations of carbon nanoparticles and printer toner particles with a more regular shape. The proposed tool can be used for the transportation of light-absorbing particles, such as biological nano- and micro-objects, or for the touch-free sampling of airborne particles being measured.
Highlights
A complex amplitude of a Gaussian beam diffracted on a cylindrical lens with a focal length f and transmission function of exp ðÀikn2=2f Þ at distance z is described by a Fresnel transform,22
We present an all-optical tool for the massive transfer of airborne light-absorbing particles
In this Letter, we propose using a light sheet trap generated by a cylindrical lens as a tool for the massive transfer of airborne light-absorbing particles
Summary
A complex amplitude of a Gaussian beam diffracted on a cylindrical lens with a focal length f and transmission function of exp ðÀikn2=2f Þ at distance z is described by a Fresnel transform,22. A generated light sheet trap can be used as an “optical mill” for guiding particles via photophoretic forces. In 2012, researchers demonstrated a photophoretic trampoline21 based on a high-intensity light sheet that was generated using a cylindrical lens (CL) and off which light-absorbing liquid droplets could bounce.
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