NTEGRA Spectra Probe NanoLaboratory. SNOM Measuring Head. Instruction Manual
NOTE. The optimal level (in modulus) of the PMT output for
measurements is 1 V. Higher output results not only in direct raise of
the noise level
RMS
but also in heating the PMT module that
contributes to noise. On the other hand, lower output may result in
insufficient sensitivity.
4. Scan an area around the focus of the detection system by the laser beam as follows:
a. Define the following values of the scan parameters:
- X and Y pixel dimensions of the scan area (Point Number parameter) – 100;
- Metrical size of the scan area (Scan Size parameter) – 20 µm;
- Detection signal (in the list of available signals Select Signals) – PMT;
- Time of measuring at a point (Time/point parameter) – 62.5 µs.
b. Using the
tool, select the scan area so that the green cross of the marker in the
2D Viewer is at its center.
Fig. 4-9. Selecting the scan area
c. Start scanning the selected area. Intensity distribution of the detected signal will
be acquired (Fig. 4-10).
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