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

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

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