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Title: Phase stabilized homodyne of infrared scattering type scanning near-field optical microscopy

Scattering type scanning near-field optical microscopy (s-SNOM) allows sub diffraction limited spatial resolution. Interferometric homodyne detection in s-SNOM can amplify the signal and extract vibrational responses based on sample absorption. A stable reference phase is required for a high quality homodyne-detected near-field signal. This work presents the development of a phase stabilization mechanism for s-SNOM to provide stable homodyne conditions. The phase stability is found to be better than 0.05 rad for the mid infrared light source. Phase stabilization results in improved near field images and vibrational spectroscopies. Spatial inhomogeneities of the boron nitride nanotubes are measured and compared.
Authors:
 [1] ; ;  [2]
  1. Department of Chemistry, Lehigh University, Bethlehem, Pennsylvania 18015 (United States)
  2. Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6 (Canada)
Publication Date:
OSTI Identifier:
22395621
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 26; 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; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION SPECTROSCOPY; BORON NITRIDES; COMPARATIVE EVALUATIONS; DIFFRACTION; IMAGES; LIGHT SOURCES; NANOTUBES; OPTICAL MICROSCOPY; PHASE STABILITY; SPATIAL RESOLUTION; STABILIZATION