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THz PMT
R17201-01
The R17201-01 is a photomultiplier tube (PMT) that utilizes metasurface technology for THz wave-to-electron conversion and has sensitivity in the THz wave region. It utilizes field electron emission technology, and the signal current changes non-linearly in accordance with the electric field intensity of the incident THz wave, making it possible to enhance and detect micro-changes in THz waves that had been difficult to detect with conventional detectors.
Features
- High-speed response (several ns)
- Micro-change measurement by non-linear response characteristics
- Direct measurement of THz wave electric field intensity
Multiplication principle
- A THz wave is incident in the effective area of the THz PMT.
- Electrons are emitted from the metasurface into the vacuum by field electron emission according to the electric field intensity of the THz wave.
- Electrons collected by the dynode are amplified 100,000 to 1,000,000 times.
- The amplified signal current can be measured by connecting a readout system to the anode.
Output characteristics
The graph below shows the input/output characteristics of the THz PMT.
While a normal PMT/I.I. that uses the external photoelectric effect produces a signal current proportional to the incident light, a THz PMT/I.I. that uses field electron emission increases and decreases the signal current non-linearly according to the incident THz wave.
This allows for clear detection of slight differences in incident THz waves that are difficult to detect with a linear response detector.
Spectral characteristics
This graph shows the response characteristics of the THz PMT for each THz wave frequency.
It shows the strongest response around 1 THz, and there is a wide range of sensitivity from 0.5 to 2.0 THz.
It can be seen that the incident THz wave attenuates at frequencies where absorption by water vapor occurs, and that the signal intensity of the THz PMT decreases accordingly.
Polarization characteristics
As the THz PMT and THz I.I. are based on the detection principle of electric field emission by an antenna, the response varies depending on the polarization direction of the incident THz wave.
The graph below shows the response characteristics of the THz PMT for each polarization direction. By using this characteristic, it is also possible to measure the polarization direction of the incident THz wave.
θ=90 deg
Horizontal polarization of THz wave
θ=0 deg
Vertical polarization of THz wave
Specifications
| Parameter | Description/Value | Unit | |
|---|---|---|---|
| Photocathode | Metasurface | ― | |
| Effective area | 6 x 6 | mm | |
| Window material | Silica glass | ― | |
| Dynode | Structure | Linear focused | ― |
| Number of stages | 10 | ― | |
| Threshold E-field*1 | Typ. | 5 | kV/cm |
| Recommended spectral response | 0.5 to 2.0 | THz | |
| Supply voltage | -1500 | V | |
| Maximum supply voltage | -1800 | V | |
| Rise time*1 | 1.6 | ns | |
| Operating ambient/storage temperature | -30 to +50 | ℃ | |
*1: Supply voltage to PMT -1500 V, THz frequency 1.05 THz
Dimensional outline (Unit: mm)
- Confirmation
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