| Micro/nanoparticle induced near-field laser ultra-focusing and heating has been widely used in laser-assisted nanopatterning and nanolithography to pattern nanoscale features on a large-area substrate. Probing of the temperature, stress, and optical fields induced by the nanoscale near-field laser heating remains a great challenge since the heating area is very small (~100 nm or less) and not immediately accessible for sensing. Raman scattering method is a promising tool for noncontact temperature and thermal stress measurements.;In this work, the first experimental study is reported on nanoscale mapping and thermal probing of particle- and fiber-induced thermal, stress, and optical fields by using a single laser for both near-field excitation and Raman probing. The mapping results based on Raman intensity variation, wavenumber shift, and linewidth broadening all give consistent conjugated thermal, stress, and near-field focusing effects with an accuracy of 20 nm ( |
