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FT-IR-spectrometers, Raman spectrometers

DME - Danish Micro Engineering A/S

  • Raman spectrometer / laboratory

Article: 00055163

Raman spectrometer / laboratory

This system is a special version of a UHV Scanning Tunnelling Microscope allowing conducting tip enhanced raman spectroscopy (TERS) measurements.

UHV Tip Enhanced Raman Spectroscopy System
I.e. by nature, the signal to noise ratio in a Tip Enhanced Raman Spectroscopy (TERS) measurement is by nature very low, even though the tip amplifies the Raman signal by many orders of magnitude. This is due to the high lateral resolution and the low intensity of a Raman emission. To keep integration times for the optical measurement low, the optical system must have a numerical aperture as high as possible. Prinzip RAMAN-Setup The sketch on the right shows a setup with a numerical aperture of nearly 1. Almost the whole half sphere above the sample is used as light path.

Such a system working in ultra high vaccum was designed by us in close cooperation with the Department of Physical Chemistry of the Fritz-Haber-Institut in Berlin, Germany (former director was Prof. G. Ertl). The system has following the properties:
A 5 axis movable stage with a resolution of about 100 nm allows exact mirror positioning to perfectly align STM tip and focal point.
Samples and STM tips can be exchanged without breaking the vacuum and without a risk of damage by a specially designed transfer mechanism.
For vibrational damping purposes the whole optical and STM setup was designed on a free swinging platform. Light transfer is realized via glass fibers.
The STM provides atomic resolution in all three dimensions.
With few modifications this system can also be equipped with a shear force AFM scanner, so that also non-conductive samples can be examined.

Specifications

  • Type: Raman
  • Domain: laboratory

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