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Proceedings Paper

Enhanced Raman spectroscopy in the deep ultraviolet: custom-designed optics for continuously tuneable excitation
Author(s): Roland K. Appel; Chris Dyer; Anita C. Jones; Andy Bell; John Lockwood
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Paper Abstract

A prototype optical system has been constructed that is chromatically-corrected from the deep ultraviolet (UV) to the far red (200-700nm), facilitating reliable and straightforward sample positioning, as required for quantitative resonance Raman spectroscopy (RRS). The collection side is fully achromatic, whilst the illumination side requires minimal user intervention. Results are presented that demonstrate the axial and spatial imaging performance of the instrument. Spectra illustrate the application of RRS for selective enhancement of analytes in low concentration. Variations in enhancement factor and spectral signature as a function of excitation wavelength are demonstrated. The results illustrate the need for well-characterized achromatic optics when carrying out quantitative investigation using a tuneable UV source laser. A UV-sensitive video-rate CCD is also incorporated into the optical scheme, enabling limited operation as a deep UV microscope. An imaging resolution of approximately 7 micrometers has been demonstrated.

Paper Details

Date Published: 22 February 2002
PDF: 10 pages
Proc. SPIE 4577, Vibrational Spectroscopy-based Sensor Systems, (22 February 2002); doi: 10.1117/12.455747
Show Author Affiliations
Roland K. Appel, QinetiQ Ltd. (United Kingdom)
Chris Dyer, Defence Science and Technology Lab. (United Kingdom)
Anita C. Jones, Defence Science and Technology Lab. (United Kingdom)
Andy Bell, Defence Science and Technology Lab. (United Kingdom)
John Lockwood, QinetiQ Ltd. (United Kingdom)

Published in SPIE Proceedings Vol. 4577:
Vibrational Spectroscopy-based Sensor Systems
Steven D. Christesen; Arthur J. Sedlacek, Editor(s)

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