Reduction of noise in very long wave infrared quantum cascade detectors
2012
Noise in quantum cascade detectors is studied experimentally and theoretically. Measurements were performed in dark
conditions on a quantum cascade detector operating at 14.5 μm, in the very long wave infrared range. To investigate the
signal-to-noise contributions of each intersubband transition involved in the transport, a model of noise has been
developed. It is based on a noise equivalent electrical circuit of the quantum cascade detector. Non-radiative diagonal
transitions (fundamental state to levels of the cascade structure) are identified as dominant contributions to the dark
current and noise in the measured device. Based on these theoretical considerations, new optimized structures for the
very long wave-infrared range are designed and exhibit a noise reduction down to a factor three at optimum responsivity.
Keywords:
- Correction
- Source
- Cite
- Save
- Machine Reading By IdeaReader
0
References
2
Citations
NaN
KQI