1. Describe briefly the spectral characteristics of the followi ng detectors and explain the reasons for their particular spectral response shape.
(a) InSb photovoltaic detector
(b) Bol ometer
(c) Quantum \Yell in tersubband photodetector
2. Consider a hypothetical IlgCdTe photodiode with an active area of 500 µmx SOO tm, R0=500 Mn, quantu m efficiency=0.6 operati ng at 80 K. Calculate the device specific dctecti vity at 8 µm \vavclcngth.
3. List a few advantages and disadvantages of photovoltaic and photocond uctivc detectors.