Highly selective standoff detection and imaging of trace chemicals in a complex background using single-beam coherent anti-Stokes Raman scattering

Bremer, Marshall T.; Wrzesinski, Paul J.; Butcher, Nathan; Lozovoy, Vadim V.; Dantus, Marcos

doi:10.1063/1.3636436

Cited by 62 publications

(45 citation statements)

References 19 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Due to the uniqueness of molecular rotational and vibrational Raman spectra, CARS has often been used as a chemical sensing tool. In this context, CARS techniques have been developed for species identification in the microscopic imaging of biological tissues, 1, 2 the standoff detection of explosives, 3 and species concentration measurements in combustion. 4,5 While some of the early work in gas-phase CARS required tuning the frequency of one of the beams to generate a CARS spectrum, 6,7 multiplex CARS utilizing broadband preparation pulses has been implemented [7][8][9] to measure the population distribution within the rotational and vibrational energy levels of the probed molecules within a single laser shot, making CARS an exquisite probe of the local instantaneous temperature, 10 a scalar of vital importance to the probing of reacting flows.…”

mentioning

confidence: 99%

Communication: Two-dimensional gas-phase coherent anti-Stokes Raman spectroscopy (2D-CARS): Simultaneous planar imaging and multiplex spectroscopy in a single laser shot

Bohlin

Kliewer²

2013

The Journal of Chemical Physics

View full text Add to dashboard Cite

Coherent anti-Stokes Raman spectroscopy (CARS) has been widely used as a powerful tool for chemical sensing, molecular dynamics measurements, and rovibrational spectroscopy since its development over 30 years ago, finding use in fields of study as diverse as combustion diagnostics, cell biology, plasma physics, and the standoff detection of explosives. The capability for acquiring resolved CARS spectra in multiple spatial dimensions within a single laser shot has been a long-standing goal for the study of dynamical processes, but has proven elusive because of both phase-matching and detection considerations. Here, by combining new phase matching and detection schemes with the high efficiency of femtosecond excitation of Raman coherences, we introduce a technique for single-shot two-dimensional (2D) spatial measurements of gas phase CARS spectra. We demonstrate a spectrometer enabling both 2D plane imaging and spectroscopy simultaneously, and present the instantaneous measurement of 15,000 spatially correlated rotational CARS spectra in N2 and air over a 2D field of 40 mm(2).

show abstract

mentioning

confidence: 99%

Communication: Two-dimensional gas-phase coherent anti-Stokes Raman spectroscopy (2D-CARS): Simultaneous planar imaging and multiplex spectroscopy in a single laser shot

Bohlin

Kliewer²

2013

The Journal of Chemical Physics

View full text Add to dashboard Cite

show abstract

“…Coherent anti-Stokes Raman spectroscopy (CARS) using pulse shaping of a femtosecond supercontinuum was used for spectral identification and scanned imaging of DNT and other chemicals [132]. Femtosecond CARS with pulse shaping for selective excitation of desired features in explosives has also been achieved [133][134][135].…”

Section: Coherent Ramanmentioning

confidence: 99%

Advances in explosives analysis—part II: photon and neutron methods

et al. 2015

View full text Add to dashboard Cite

The number and capability of explosives detection and analysis methods have increased dramatically since publication of the Analytical and Bioanalytical Chemistry special issue devoted to Explosives Analysis [Moore DS, Goodpaster JV, Anal Bioanal Chem 395:245-246, 2009]. Here we review and critically evaluate the latest (the past five years) important advances in explosives detection, with details of the improvements over previous methods, and suggest possible avenues towards further advances in, e.g., stand-off distance, detection limit, selectivity, and penetration through camouflage or packaging. The review consists of two parts. Part I discussed methods based on animals, chemicals (including colorimetry, molecularly imprinted polymers, electrochemistry, and immunochemistry), ions (both ion-mobility spectrometry and mass spectrometry), and mechanical devices. This part, Part II, will review methods based on photons, from very energetic photons including X-rays and gamma rays down to the terahertz range, and neutrons.

show abstract

“…As a result, investments have been made toward developing optical standoff detection approaches [3], including visible Raman scattering [4,5], laser-induced breakdown spectroscopy (LIBS) [6,7], photofragment (PF)-based approaches [8], coherent anti-Stokes Raman scattering (CARS) [9], and both passive and active infrared detection [10]. Thus far not one of these approaches has demonstrated the potential to achieve standoff detection of explosives traces with a field-deployable system on a variety of surfaces in realistic conditions.…”

Section: Introductionmentioning

confidence: 99%

Standoff ultraviolet raman scattering detection of trace levels of explosives.

Kulp¹,

Bisson²,

Reichardt³

2011

View full text Add to dashboard Cite

Ultraviolet (UV) Raman scattering with a 244-nm laser is evaluated for standoff detection of explosive compounds. The measured Raman scattering albedo is incorporated into a performance model that focused on standoff detection of trace levels of explosives. This model shows that detection at ~100 m would likely require tens of seconds, discouraging application at such ranges, and prohibiting search-mode detection, while leaving open the possibility of short-range pointand-stare detection. UV Raman spectra are also acquired for a number of anticipated background surfaces: tile, concrete, aluminum, cloth, and two different car paints (black and silver). While these spectra contained features in the same spectral range as those for TNT, we do not observe any spectra similar to that of TNT.

show abstract

Highly selective standoff detection and imaging of trace chemicals in a complex background using single-beam coherent anti-Stokes Raman scattering

Cited by 62 publications

References 19 publications

Communication: Two-dimensional gas-phase coherent anti-Stokes Raman spectroscopy (2D-CARS): Simultaneous planar imaging and multiplex spectroscopy in a single laser shot

Communication: Two-dimensional gas-phase coherent anti-Stokes Raman spectroscopy (2D-CARS): Simultaneous planar imaging and multiplex spectroscopy in a single laser shot

Advances in explosives analysis—part II: photon and neutron methods

Standoff ultraviolet raman scattering detection of trace levels of explosives.

Contact Info

Product

Resources

About