Raman Spectrometer (custom built multi-wavelengths)

The Micro-Raman Spectrometer uses a fingerprint technique to identify materials based on vibrations. Its sensitivity can give information on composition and strain.

Capabilities

• 4 lasers: 355nm, 532 nm, 633nm and 785 nm
• Spatial resolution: ~ 0.5 microns
• Spectral resolution: < 1 cm-1
• 3 spectrometers: depending on applications:
  • 300 mm visible
  • 750 mm visible
  • 300 mm Near IR optimized Si detector
• Can collect down to 5 cm-1 with 532nm laser.
• Polarization control (both incident laser (including circularly polarized incident laser and signal)
• Raman mapping capabilities (New high-resolution stage installed in 2017)
• Photoluminescence

No or minimal sample preparation

• Nondestructive
• Works for most liquid, gas or solid
• Pure phase, multi-phases, glasses, single crystals and even artwork, such as paintings

Some applications

• Phase identification (compare to a published spectrum/ standard) • investigate small chemical/structural
• Strain/defects in some material
• Sample mapping
• In situ characterization at high pressure and or temperature or within a medium

Some limitations

• Most metals are difficult or impossible to observe
• Sample fluorescent
• Symmetry of the material

Contact

Emmanuel Soignard
Operations Director
Emmanuel.Soignard@asu.edu
480.965.7242

Douglas Daniel
Associate Research Professional
DDaniel@asu.edu
480-727-8383