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Title: Photothermal single particle microscopy using a single laser beam

We introduce a single-laser-beam photothermal microscopy scheme for the detection of single absorbing nano-objects. Here, a modulated incident laser beam with a constant intensity offset serves as pump and probe beam at the same time. Using the out-of-phase scattering response of the retarded thermorefractive wave field, the method provides a selective contrast for absorbers over a possible background of scatterers. The use of a single wavelength and a single beam, considerably simplifies the setup and integration of photothermal detection in existing microscopy schemes.
Authors:
; ; ;  [1]
  1. Molecular Nanophotonics Group, Institute of Experimental Physics I, Universität Leipzig, 04103 Leipzig (Germany)
Publication Date:
OSTI Identifier:
22303965
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 1; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; BEAMS; DETECTION; LASER RADIATION; MICROSCOPY; NANOSTRUCTURES; SCATTERING; WAVELENGTHS