Infrared near-field spectroscopy of trace explosives using an external cavity quantum cascade laser

Ian M. Craig; Matthew S. Taubman; A. Scott Lea; Mark C. Phillips; Erik E. Josberger; Markus B. Raschke

doi:10.1364/OE.21.030401

Infrared near-field spectroscopy of trace explosives using an external cavity quantum cascade laser

Ian M. Craig, Matthew S. Taubman, A. Scott Lea, Mark C. Phillips, Erik E. Josberger, Markus B. Raschke

Research output: Contribution to journal › Article › peer-review

32 Scopus citations

Abstract

Utilizing a broadly-tunable external cavity quantum cascade laser for scattering-type scanning near-field optical microscopy (s-SNOM), we measure infrared spectra of particles of explosives by probing characteristic nitro-group resonances in the 7.1-7.9 μm wavelength range. Measurements are presented with spectral resolution of 0.25 cm^-1, spatial resolution of 25 nm, sensitivity better than 100 attomoles, and at a rapid acquisition time of 90 s per spectrum. We demonstrate high reproducibility of the acquired s-SNOM spectra with very high signal-to-noise ratios and relative noise of <0.02 in self-homodyne detection.

Original language	English (US)
Pages (from-to)	30401-30414
Number of pages	14
Journal	Optics Express
Volume	21
Issue number	25
DOIs	https://doi.org/10.1364/OE.21.030401
State	Published - Dec 16 2013
Externally published	Yes

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics

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title = "Infrared near-field spectroscopy of trace explosives using an external cavity quantum cascade laser",

abstract = "Utilizing a broadly-tunable external cavity quantum cascade laser for scattering-type scanning near-field optical microscopy (s-SNOM), we measure infrared spectra of particles of explosives by probing characteristic nitro-group resonances in the 7.1-7.9 μm wavelength range. Measurements are presented with spectral resolution of 0.25 cm-1, spatial resolution of 25 nm, sensitivity better than 100 attomoles, and at a rapid acquisition time of 90 s per spectrum. We demonstrate high reproducibility of the acquired s-SNOM spectra with very high signal-to-noise ratios and relative noise of <0.02 in self-homodyne detection.",

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AU - Craig, Ian M.

AU - Taubman, Matthew S.

AU - Lea, A. Scott

AU - Phillips, Mark C.

AU - Josberger, Erik E.

AU - Raschke, Markus B.

PY - 2013/12/16

Y1 - 2013/12/16

N2 - Utilizing a broadly-tunable external cavity quantum cascade laser for scattering-type scanning near-field optical microscopy (s-SNOM), we measure infrared spectra of particles of explosives by probing characteristic nitro-group resonances in the 7.1-7.9 μm wavelength range. Measurements are presented with spectral resolution of 0.25 cm-1, spatial resolution of 25 nm, sensitivity better than 100 attomoles, and at a rapid acquisition time of 90 s per spectrum. We demonstrate high reproducibility of the acquired s-SNOM spectra with very high signal-to-noise ratios and relative noise of <0.02 in self-homodyne detection.

AB - Utilizing a broadly-tunable external cavity quantum cascade laser for scattering-type scanning near-field optical microscopy (s-SNOM), we measure infrared spectra of particles of explosives by probing characteristic nitro-group resonances in the 7.1-7.9 μm wavelength range. Measurements are presented with spectral resolution of 0.25 cm-1, spatial resolution of 25 nm, sensitivity better than 100 attomoles, and at a rapid acquisition time of 90 s per spectrum. We demonstrate high reproducibility of the acquired s-SNOM spectra with very high signal-to-noise ratios and relative noise of <0.02 in self-homodyne detection.

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Infrared near-field spectroscopy of trace explosives using an external cavity quantum cascade laser

Abstract

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