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Broadband infrared vibrational nano-spectroscopy using thermal blackbody radiation

Journal Article · · Optics Express
DOI:https://doi.org/10.1364/OE.23.032063· OSTI ID:1240131
 [1];  [2];  [2];  [2];  [2];  [2]
  1. Univ. of Colorado, Boulder, CO (United States); University of Colorado
  2. Univ. of Colorado, Boulder, CO (United States)

Infrared vibrational nano-spectroscopy based on scattering scanning near-field optical microscopy (s-SNOM) provides intrinsic chemical specificity with nanometer spatial resolution. Here we use incoherent infrared radiation from a 1400 K thermal blackbody emitter for broadband infrared (IR) nano-spectroscopy.With optimized interferometric heterodyne signal amplification we achieve few-monolayer sensitivity in phonon polariton spectroscopy and attomolar molecular vibrational spectroscopy. Near-field localization and nanoscale spatial resolution is demonstrated in imaging flakes of hexagonal boron nitride (hBN) and determination of its phonon polariton dispersion relation. The signal-to-noise ratio calculations and analysis for different samples and illumination sources provide a reference for irradiance requirements and the attainable near-field signal levels in s-SNOM in general. As a result, the use of a thermal emitter as an IR source thus opens s-SNOM for routine chemical FTIR nano-spectroscopy.

Research Organization:
Univ. of Colorado, Boulder, CO (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0008807
OSTI ID:
1240131
Journal Information:
Optics Express, Journal Name: Optics Express Journal Issue: 25 Vol. 23; ISSN 1094-4087; ISSN OPEXFF
Publisher:
Optical Society of America (OSA)Copyright Statement
Country of Publication:
United States
Language:
English

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Cited By (6)

Review: Tip-based vibrational spectroscopy for nanoscale analysis of emerging energy materials journal January 2018
Hyperspectral infrared nanoimaging of organic samples based on Fourier transform infrared nanospectroscopy journal February 2017
Near-field magneto-caloritronic nanoscopy on ferromagnetic nanostructures journal December 2018
Comparison of active and passive methods for the infrared scanning near-field microscopy journal April 2019
Broadband near-field infrared spectroscopy with a high temperature plasma light source journal January 2017
Near-field magneto-caloritronic nanoscopy on ferromagnetic nanostructures text January 2019

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