Infrared and Raman Spectroscopic Imaging

Steiner, Gerald

doi:10.1002/9781118271933.ch9

Cited by 2 publications

(2 citation statements)

References 36 publications

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“…24 Raman imaging instruments can be broadly differentiated by whether they involve raster-scanning or wide-field illumination. 25 Raster-scan Raman imaging instruments typically either translate a focused laser and collection optics across a stationary sample or utilize scanning stages that precisely move the sample in front of a stationary focused laser. Raman spectra are measured at discrete points on the sample utilizing a traditional Raman spectrometer.…”

Section: Introductionmentioning

confidence: 99%

Ultraviolet Raman Wide-Field Hyperspectral Imaging Spectrometer for Standoff Trace Explosive Detection

2016

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We constructed the first deep ultraviolet (UV) Raman standoff wide-field imaging spectrometer. Our novel deep UV imaging spectrometer utilizes a photonic crystal to select Raman spectral regions for detection. The photonic crystal is composed of highly charged, monodisperse 35.5 ± 2.9 nm silica nanoparticles that self-assemble in solution to produce a face centered cubic crystalline colloidal array that Bragg diffracts a narrow ∼1.0 nm full width at half-maximum (FWHM) UV spectral region. We utilize this photonic crystal to select and image two different spectral regions containing resonance Raman bands of pentaerythritol tetranitrate (PETN) and NHNO (AN). These two deep UV Raman spectral regions diffracted were selected by angle tuning the photonic crystal. We utilized this imaging spectrometer to measure 229 nm excited UV Raman images containing ∼10-1000 µg/cm samples of solid PETN and AN on aluminum surfaces at 2.3 m standoff distances. We estimate detection limits of ∼1 µg/cm for PETN and AN films under these experimental conditions.

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Section: Introductionmentioning

confidence: 99%

Ultraviolet Raman Wide-Field Hyperspectral Imaging Spectrometer for Standoff Trace Explosive Detection

2016

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“…Mapping instruments use a focused laser beam and a precision sample translation stage. 14,15 To create an image, the laser is rastered over the sample surface while collecting Raman-scattered light at each desired position. The collected light at each position is dispersed using a traditional Raman spectrometer.…”

Section: Introductionmentioning

confidence: 99%

Raman Hyperspectral Imaging Spectrometer Utilizing Crystalline Colloidal Array Photonic Crystal Diffraction

2014

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We fabricated a novel hyperspectral Raman imaging spectrometer that, for the first time, uses a photonic-crystal wavelength-selecting device to select a narrow-wavelength spectral interval. The photonic crystal consists of an array of highly charged, monodisperse polystyrene particles that self-assemble into a face-centered cubic crystal. The photonic crystal Bragg-diffracts a narrow spectral interval that can be tuned by altering the incident angle of collimated Raman scattered light. Our prototype spectrometer diffracts a ~200 cm(-1) interval of the 488 nm excited visible Raman spectrum of Teflon. This enabled us to select a close-lying triplet of Teflon Raman bands. We imaged the Teflon surface by focusing this narrow region onto a charge-coupled device to create a Raman image of the sample surface that spectrally details the chemical composition.

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Infrared and Raman Spectroscopic Imaging

Cited by 2 publications

References 36 publications

Ultraviolet Raman Wide-Field Hyperspectral Imaging Spectrometer for Standoff Trace Explosive Detection

Ultraviolet Raman Wide-Field Hyperspectral Imaging Spectrometer for Standoff Trace Explosive Detection

Raman Hyperspectral Imaging Spectrometer Utilizing Crystalline Colloidal Array Photonic Crystal Diffraction

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