Raman Spectroscopy

Jun 01, 2006
Special Issues
By Spectroscopy Editors
Chemical images of polystyrene beads on silicon acquired using Raman mapping and image processing are reviewed. The effects of the objective on the quality of the final image, particularly its magnification and numerical aperture, and the step size of the map, are discussed as well.
Jun 01, 2006
Special Issues
By Spectroscopy Editors
Outstanding stray light rejection performance of a triple-spectrometer system is demonstrated. Low-frequency Raman spectra of solid powder samples, including Stokes-AntiStokes Raman data, as low as 5 cm-? from the excitation line are presented.
Jun 01, 2006
Special Issues
By Spectroscopy Editors
Recent progress in photonic crystal design is transforming surface-enhanced Raman spectroscopy (SERS) from a research tool into a powerful new analytical technique. High sensitivity can be achieved due to the enormous amplification of the Raman signal of molecules in contact with nanostructured metal surfaces. This article highlights the performance of SERS substrates for a range of applications, illustrating the versatility of the technology, as well as future directions.
Apr 01, 2006
Spectroscopy
Surface-enhanced Raman spectroscopy (SERS) is a widely studied technique capable of adding single-molecule detection capability to the rich information provided by Raman spectroscopy. in this aricle, the authors show an additional system gain of more than two orders of magnitude to SERS by using a dielectric microsphere resonator to capture and excite the target system.
Feb 01, 2006
Spectroscopy
Guest author John Coates describes a new, compact handheld Raman instrument.
Jan 01, 2006
Spectroscopy
The authors review the operating principles of a silicon Raman laser and show that by introducing a longitudinal variation of the waveguide width in the cavity, the lasing efficiency can be increased significantly.
Jan 01, 2006
Spectroscopy
The authors review the operating principles of a silicon Raman laser and show that by introducing a longitudinal variation of the waveguide width in the cavity, the lasing efficiency can be increased significantly.
Jun 02, 2005
Special Issues
This article compares different CCD platforms by outlining CCD and EMCCD noise sources as well as an explanation of the two calculations to arrive at the signal-to-noise ratio for each. The data presented will show that a liquid nitrogen-cooled CCD camera still is the proper choice for low light level applications, such as Raman spectroscopy.
Jun 02, 2005
Special Issues
Raman spectroscopy has been employed to detect Bacillus cereus spores, an anthrax surrogate, collected from a letter as it passed through a mail sorting system. Raman spectroscopy also has the ability to identify many common substances used as hoaxes. A three-step method also is described for the detection of dipicolinic acid extracted from surface spores by SERS.
Jun 02, 2005
Special Issues
The acquisition of Raman spectra can be eased greatly through the use of surface-enhanced Raman spectroscopy (SERS). In this article, the authors discuss a new substrate technology that delivers reliable and consistent surface enhancement.
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