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THz PMT module
H17362
The H17362 is a photomultiplier tube (PMT) module that utilizes metasurface technology for THz wave-to-electron conversion and has sensitivity in the THz wave region. This THz PMT module incorporates a THz PMT, driver circuit, and high-voltage power supply into a compact housing. It can be operated by simply connecting it to a PC via USB. It comes with an attachment that can be easily installed on an optical table and a C-mount adapter for attaching optical components. Easy to handle even for those who are new to photomultiplier tubes.
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
Module design considering focal position measurement
When the incident THz wave is focused by an optical lens, etc., the electric field amplitude intensity is strongest at the focal position.
The THz PMT module is designed so that the detection surface is directly above the optical rod mounting hole, making it easy to measure the focal position.
Operating software
The H17362 can drive the PMT module by connecting the module and a PC terminal via USB. The device driver and sample software can be downloaded from the link below.
Specifications
| Parameter | Description/Value | Unit | |
|---|---|---|---|
| Contents | Main unit, C mount adapter and rod mounting plate | ― | |
| Input voltage | USB bus power (+4.75 to +5.25) | V ac | |
| Current consumption | 0.1 | A | |
| Photocahode | 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 | |
| Rise time*1 | 1.6 | ns | |
| Operating ambient temperature*2 | +5 to +50 | ℃ | |
| Storage temperature*2 | -20 to +50 | ℃ | |
| Operating ambient/storage humidity*2 | Below 85 | ％ | |
| Compatible OS | Windows 10/11 | ― | |
*1: Supply voltage to PMT -1500 V, THz frequency 1.05 THz
*2: No condensation
Dimensional outlines (Unit: mm)
- Confirmation
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