(From left to right) atom trapping (a few Ångstroms to a few nanometres), nanotweezers (a few nanometres to a few hundred nanometres) and optical tweezers (from a fraction of a micrometre up). The horizontal scale bar shows the average object size and the corresponding light wavelength.
Adapted from Maragò et al., Nature Nanotechnol. 8, 807–19 (2013).
Fig. 23.1 — Nanotweezers