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IR Detectors |
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IR Detectors |
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Mid-IR
detectors have a wide-ranging potential applications in sensing,
security, and especially in NIR spectrometry.
In collaboration with the university of Neuchâtel, Arcoptix
presents different types of indium phosphide (InP)-based quantum-cascade detectors (QCDs) operating
from 4 and 17.5 µm.
QCDs have an improved absorption efficiency compared to other IR detectors and they do not require a bias voltage for operation, meaning there is no dark-current noise and no integration-time limitation due to capacitance saturation in the readout circuit.
How does it work?
The active region of a QCD is built up of multiple periods, each containing a thick, degenerately doped active QW and a nominally undoped extraction cascade composed of thinner QWs. The function of this cascade is to introduce an asymmetry in the conduction band potential such that photoexcited electrons have a preferential escape direction, resulting in a measurable net photocurrent.
Specs:
|
Features |
QCD Detectors |
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Detector size |
100, 200, or 300 µm2 |
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Responsivity at 10K: |
10mA/W |
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Responsivity at 300K: |
1mA/W |
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Detectivity 10K |
5 1010 Jones (cmHz1/2/W) |
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Detectivity 300K |
5 107 Jones (cmHz1/2/W) |
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3dB frequency |
3GHz |
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Max. frequency |
10GHz |
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Operating temparture |
10-350K |
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Available Wavelengths |
4.0,4.7,5.3,7.7,9.3,10.4,17.5 µm |
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Specific linewidth(FWHM) |
8% @ 300k |
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Mode of Operation |
Photovoltaic, no voltage bias necessary |
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Dark Current |
0 (bias free operation) |
Detectivities at 200K:
| Wavelengths | Detectivity [jones] (cmHz1/2/W) @ 200K |
| 2.4 µm | 5x1010 |
| 3.9 µm | 1x109 |
| 4.7 µm | 7x108 |
| 7.5 µm | 6x107 |
| 10.6 µm | 5x107 |
| 17 µm @ 77k | 3x107 |
For further information contact: Daniel.hofstetter@unine.ch