Classes of PhotodetectorClassification of Photodetector
Based on their uses, there are two principal classes of photodetectors commonly which are common in used:
- Thermal Detectors
- Photoelectric Detectors
Thermal Detectors
In this class of detectors, when incident light falls on the surface of the detector, it leads to temperature rise which is measured. It operates by converting charged carriers’ energy into heat.
The temperature raise is directly proportional to the amount of light absorbed by the detector.
It is mainly used for detecting infrared radiation.
However, most of the thermal detectors are low in efficiency and require more time to show temperature variation. That is why it is not suitable for most photonic applications.
Photoelectric detectors
In this class of detectors, when the light falls on the surface of material then there is absorption of photons which results directly in an electronic transition to a higher energy level. Due to this, there are generations of moving charged carriers(electron-hole pairs).
The operating principle of these detector is photo effect.
Under the effect of an electric field, these moving charged carriers produce electrical signals in the form of electric current.
These detectors are widely used for photonic applications.
Photodetector
A photo is nothing but light. A detector is nothing but a device that detects something. Therefore, we can directly conclude that a photodetector can be defined as a device that is used to detect light radiations by absorption. In this Article, We will be going through Photodetector, We will start our Article with What is Photodetector?, Then we will go through its brief Working, then we will go through its properties and go through all the types, At last, we will conclude our Article with Advantages, Disadvantages and Some FAQs.
Table of Content
- What is PhotoDetectors ?
- Working of PhotoDetector
- Classes of PhotoDetector
- Photodetector Properties
- Types of PhotoDetector
- Comparison Between Photodetector and Photodiode
- Applications of Photodetector