Reversing the Faraday effect to get an induced current

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SUMMARY

The discussion centers on the feasibility of reversing the Faraday effect to induce current in a coil using a variable magnetic field interacting with polarized light. Participants highlight the challenges of utilizing nano coils and the need for special materials or crystals that can operate at the appropriate wavelengths. The Faraday effect, which involves the rotation of polarization in transparent materials under strong magnetic fields, is acknowledged, but reversing this effect is deemed unlikely due to energy constraints. Instead, the focus shifts to the potential of micro-antennas and the difficulties associated with low-loss transmission lines at optical frequencies.

PREREQUISITES
  • Understanding of the Faraday effect and its implications in electromagnetism.
  • Familiarity with antenna theory, particularly micro and nano antennas.
  • Knowledge of materials science, specifically crystals that can absorb UV and emit in the infrared range.
  • Basic principles of electromagnetic wave interaction with matter.
NEXT STEPS
  • Research the design and application of micro-antennas for energy extraction from electromagnetic waves.
  • Explore advancements in materials that exhibit luminescence and their potential for inducing current.
  • Investigate low-loss transmission line technologies suitable for optical frequencies.
  • Review current literature on the limitations and challenges of nano-structures in antenna technology.
USEFUL FOR

Researchers in electromagnetism, materials scientists, and engineers focused on antenna design and energy harvesting from electromagnetic waves.

romeo17
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Hi all!
I was thinking if it is possible to revert the Faraday effect.
If I have a magnetic field, it interacts with EM wave (light) by changing its polarisation.

Can I got a variable magnetic field interacting with polarised light so that I can get induced current in a coil?

I can understand it is something similar to Nantenna, and I can understand that I need nano coils which are difficult to realize but I was thinking more to utilize special materials as mean (or crystals) to be at the right wave length to get induced current in a coil.

Is there any research in this? any link to suggest to me?
 
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It is not just "something similar to" an antenna, it is an antenna. This is what an antenna does - it generates a current by interacting with an EM wave. There is certainly research on making antennas small enough to interact with light, such as this article.
 
romeo17 said:
Hi all!
I was thinking if it is possible to revert the Faraday effect.
If I have a magnetic field, it interacts with EM wave (light) by changing its polarisation.

Can I got a variable magnetic field interacting with polarised light so that I can get induced current in a coil?

I can understand it is something similar to Nantenna, and I can understand that I need nano coils which are difficult to realize but I was thinking more to utilize special materials as mean (or crystals) to be at the right wave length to get induced current in a coil.

Is there any research in this? any link to suggest to me?
Faraday Effect is when we apply a very strong magnetic field to a transparent material and observe a slight rotation of polarisation. The reverse process does not seem likely due to the relative energies involved. On the other hand, as has been mentioned, we can use receiving antennas which are similar in size to the wavelength, including coils, to extract energy from an EM wave. I think a difficulty with optical frequencies is making low loss transmission lines for the received power.
 
Thanks both for the kind answers and article.

Well, I was thinking to have coils thickness at microwaves/infrared wavelength (micro-antenna), not at UV (nano-antenna).
I read that the issue with Nantenna are technological 1. nano-structures difficult to manufacture 2. diods are too slow to produce direct current at high frequency

If there is a crystal that absorbes UV and issue micro/infrared waves (luminescence) it should induce current in micro coils.
I think it should be properly polarized to maximize the delta flux in the coil.

I was wandering if someone of you know some research/article on this specific matter.
 

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