![Fig. 19.1 — Photophoretic optical trap](https://i0.wp.com/opticaltweezers.org/wp-content/uploads/2015/11/Fig19_1.png?fit=660%2C492)
Trapping of an agglomerate of carbon nanoparticles at the intensity minimum of an optical bottle, i.e., the spherically aberrated focus of a laser beam. Because photophoretic forces are several order of magnitude strong than optical forces, trapping is achieved with just 5 μW laser power.
Reprinted from Shvedov et al., Opt. Express 19, 17 350–6. Copyright (2011) The Optical Society.
Fig. 19.1 — Photophoretic optical trap