Terahertz radiation converted into heat

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Discussion Overview

The discussion centers around the conversion of terahertz (THz) radiation into heat energy, particularly in the context of a detector element receiving THz radiation. Participants explore the factors influencing this conversion, including surface properties and absorption efficiency.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant inquires about the percentage of THz radiation converted into heat energy, considering the scenario of a beam incident on a detector.
  • Another participant suggests that the conversion depends on the surface reflectivity, noting that moisture can affect the absorption due to water bands at these wavelengths.
  • A different participant emphasizes that not all absorbed radiation is converted into heat, seeking clarification on the percentage of absorbed energy that becomes heat.
  • One participant asserts that all absorbed energy is converted into heat, questioning where else it could go, and mentions the possibility of re-radiation and short-term energy use for chemical changes.
  • A postgraduate participant highlights the importance of absorption efficiency of the dielectric medium and expresses willingness to discuss complex questions related to terahertz radiation.

Areas of Agreement / Disagreement

Participants express differing views on the conversion of absorbed energy into heat, with some asserting that all absorbed energy becomes heat while others question this assumption. The discussion remains unresolved regarding the exact percentage of energy converted into heat.

Contextual Notes

Participants reference various factors such as surface properties, moisture, and absorption efficiency, which may influence the conversion process but do not reach a consensus on their implications.

Who May Find This Useful

This discussion may be of interest to those studying terahertz radiation, materials science, or thermal energy conversion, as well as researchers exploring detector technologies.

jgrant333
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Hello all.

Does anyone know what percentage of THz radiation is converted into heat energy? I'm thinking of the simple case where a beam of Thz radiation is incident upon some sort of detector element. The THz radiation can either be converted into kinetic energy (vibration of the molecules/atoms) or heat energy (there is not sufficient energy for inter atomic transitions etc.)

Has anyone tried to simulate such a situation?

Many thanks,
 
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It depends on the surface. Like any other form of light the amount converted into heat is just 1-reflectivity. For these wavelengths there are lots of water bands so you would also have to be careful about any moisture on the surface.
 
Of course ii depends on the amount of light reflected.

However not all of the absorbed radiation will be converted into heat. It is this % of absorbed energy converted into heat I am after.
 
All the absorbed energy is converted into heat (where else could it go?)
Some of it will be re-radiated, assuming that the object behaves like a black body you can calculate what temperature it will heat up to and how much power will be re-radiated.

-In the short term some energy could be used to change the chemical nature of the surface (eg in cooking) but then anything else will just be heat.
 
It depends on the absorption efficiency of the dielectric medium.
I am a postgraduate majored in Terahertz. So if you have some difficult questions, you could talk with me about it! I will be glad to talk with you about my major.
 

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