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

被引：29

作者：

Craig, Ian M. ^{[1
,2
]}

Taubman, Matthew S. ^{[2
]}

Lea, A. Scott ^{[1
]}

Phillips, Mark C. ^{[2
]}

Josberger, Erik E. ^{[3
,4
]}

Raschke, Markus B. ^{[3
,4
]}

机构：

[1] Pacific NW Natl Lab, Environm Mol Sci Lab, Richland, WA 99354 USA

[2] Pacific NW Natl Lab, Richland, WA 99354 USA

[3] Univ Colorado, Dept Chem, Dept Phys, Boulder, CO 80303 USA

[4] Univ Colorado, JILA, Boulder, CO 80303 USA

来源：

OPTICS EXPRESS | 2013年 / 21卷 / 25期

关键词：

OPTICAL MICROSCOPY; ANALYTICAL-MODEL; SCATTERING; ABSORPTION; LIGHT;

D O I：

10.1364/OE.21.030401

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

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 mu m 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. (C) 2013 Optical Society of America

引用

页码：30401 / 30414

页数：14

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