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  • Title: Infrared near-field spectroscopy of trace explosives using an external cavity quantum cascade laser.
    Author: Craig IM, Taubman MS, Lea AS, Phillips MC, Josberger EE, Raschke MB.
    Journal: Opt Express; 2013 Dec 16; 21(25):30401-14. PubMed ID: 24514618.
    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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