The principles, characteristics and research status of terahertz radiation sources and terahertz detectors, especially THz quantum cascade lasers (QCL) and THz quantum well infrared photon detectors (QWIP). Terahertz is analyzed Technical engineering application prospects and limiting factors. It is pointed out that the action distance is one of the key factors that determine the application of terahertz technology. If the attenuation problem of terahertz radiation when transmitted in the atmospheric troposphere cannot be effectively solved, then the application of terahertz technology on the ground or at sea will Applications may be severely restricted. Terahertz radar or communications based on airborne or spaceborne platforms have attractive application prospects.
Both of these two topics have no employment prospects. (Compared with choosing other optical topics)
So, you do not need to consider employment when choosing a topic.
The skills developed through experiments are similar for these two subjects.
In theory, it feels like there are a lot of things that can be mined in these two areas. For example, the mechanism of plasma generating terahertz, the mechanism of filament formation, etc. Don't understand nonsense.
Your boss is probably more academic, so the indicator is usually articles. Therefore, it is recommended to start by considering which topics are prone to produce articles in the past year.
And this idea should be able to last for several years. It means that if you find that a certain task A in terahertz is easy to develop, you can do A. After finishing it, you find that work B in terahertz is easy to develop, and then you can do it. Do B. This is not just about difficulty, but also about factors such as laboratory conditions and your own abilities. Of course, don’t be limited to terahertz and filaments.