Terahertz detection systems

The Terahertz detection systems are optimized for three frequency ranges, which cover the overall range of 0.1-100 THz. The system incorporates a MoRe/NbN Superconducting Hot-Electron Bolometer (SHEB) mounted on a silicon/germanium lens and low-noise cryogenically cooled high electron mobility field-effect transistors (HEMT) amplifier.
 
Scontel offers the fastest Terahertz receivers, which have sensitivity comparable with the best detection systems available today.
 
For operation superconducting detector needs cryogenic temperatures, and Scontel offers two types of cooling systems:
 
 
1) Liquid Helium Cryostat.
 
This allows for using THz detectors without expensive cryogen-free equipment. The storage dewar filled with 1 or 2 liters of helium allows for over 5 or 7 hours correspondingly of uninterrupted operation of the system. Operating temperature of the system is 4.2 K
 
 
2) Cryogen-free system. 
 
The Closed-Cycle Refrigerator is a cryogen-free cooling system which does not use liquid helium (the operating temperature is below 2.5 K). This type of detection system would be ideal for those who want to avoid handling with liquid helium. A particular advantage is that closed-cycle refrigerators can operate continuously for months from just an electrical power source.

General parameters
Number of channels: 1 or 2
Electrical connection: SMA-50 Ohm
Driver interface: USB, LabVIEW
Advantages of the System
Response time down to 50 ps
Possibilities for different beam geometry (beam pattern F/3 to F/∞ (collimated beam))
Registration of short pulses (THz pulses from nano- to picoseconds)
Ultra-high sensitivity      
 
Possible Applications:
•Radio astronomy observations
•Terahertz spectroscopy 
•Space-based astronomy
•Near-field microscopy
•All-weather navigation systems
•Near-field microscopy Remote Sensing
•Fusion Diagnostics
•Electron cyclotron emission and interferometry
•Terahertz imaging for security
•Laser radiation detection
•Materials Characterization
•Network Analyses
•Atmospheric
  
Type 1 1a 2 2a 3 3a
Frequency range, THz 0.1-6 1-12(40) 25-100
Noise equivalent power (NEP) W·Hz-1/2 5-7·10-14 3-5·10-13 1-2·10-11 6-8·10-11 1-2·10-12 4-5·10-12
Response time, ns 1 0.05 1 0.1 1 0.1
Dynamic range, μW 0.1 50 2
Bandwidth of amplifier, MHz 0.01-200 1-3500 0.01-200 1-3500 0.01-200 1-3500

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Blue line - type 1; Red line - type 2; Green line - type 3

Typical frequency dependence of the noise equivalent power (NEP) for three types of detecting system.

 

 


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