Question

Which of the following process DO NOT take place during photodetection ?​

Answer 1

Answer:

The photocurrent generated during the photodetection process is converted to the voltage through the load resistance. The load voltage is further amplified by the front-end amplifier stage. Due to random thermal motion of electrons in load resistance, the already generated photocurrent exhibits an additional thermal noise component, also known as Johnson noise

Explanation:

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Answer 2

Explanation:

THE QUESTION IS HARD

Photodetection converts an optical signal into a signal of another form. Most photodetectors convert optical signals into electrical signals that can be further processed or stored. All photodetectors are square-law detectors that respond to the power or intensity, rather than the field amplitude, of an optical signal. The electrical signal generated by an optical signal is either a photocurrent or a photovoltage that is proportional to the power of the optical signal. Based on the difference in the conversion mechanisms, there are two classes of photodetectors: photon detectors and thermal detectors. Photon detectors are quantum detectors based on the photoelectric effect, which converts a photon into an emitted electron or an electron–hole pair; a photon detector responds to the number of photons absorbed by the detector. Thermal detectors are based on the photothermal effect, which converts optical energy into heat; a thermal detector responds to the optical energy, rather than the number of photons, absorbed by the detector. Because of this fundamental difference, the general characteristics of these two classes of photodetectors have a number of important differences.