Utilizing a broadly-tunable external cavity quantum cascade laser for scattering-type scanning near-field optical microscopy (s-SNOM), we measure infrared spectra of explosives particles 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,
Revised: August 12, 2014 |
Published: December 16, 2013
Citation
Craig I.M., M.S. Taubman, A.S. Lea, M.C. Phillips, E.E. Josberger, and M.B. Raschke. 2013.Infrared near-field spectroscopy of trace explosives using an external cavity quantum cascade laser.Optics Express 21, no. 25:30401-30414.PNNL-SA-97642.doi:10.1364/OE.21.030401