2022 - Optical measurement detection unit: Cathodoluminescence
relevant to TAČR Trend FW03010504
This instrument is the result of the design of a new optical device that enables the detection and processing of light generated in the examined sample by the impact of an electron beam (cathodoluminescence) in the chamber of an electron microscope. The cathodoluminescence signal is detected using a specially modified optical fiber, fed into the electron microscope chamber using a developed micromanipulator. The unit for measuring cathodoluminescence is mainly composed of a modified optical fiber, a developed micromanipulator (Figure 1) and a modified detector based on a photomultiplier (Figure 2) or spectrophotometer.
Figure 1: Model and section of the developed micromanipulator. From left: tip with 300 micrometer hole for guiding the fiber (gray), micromanipulator fiber guide tube (orange), moving spherical manipulator body (grey), flange for mounting the manipulator to the electron microscope chamber (blue), sealing o-rings (black), o-ring pressure nuts (yellow, red), micrometric heads attachment (light gray), thread for adjusting the position in the axis of the manipulator (dark gray), vacuum seal of the guided fiber (grey). The fiber is guided in the axis of the micromanipulator tube.
Figure 2: Design of the chasis of the new detector based on the photomultiplier including the SMA connector for connecting the optical fiber and the hole for inserting the optical filters.