3 ms·

Optical Computing with Plasma [video]

superkuh 3y ago
The logic gates are pretty cool. I'm surprised they went with pure modeling to predict the plasma density in the proprietary cylinder fills. He mentions that the plasma frequency is too low to characterize with optical light but you'd think they could measure the transmission/reflection at the 5 and 6 GHz frequencies (ie those vna plots) and figure it out. Given how sharp he seems in general I'm probably missing something.
- Joel_Mckay 3y ago
  I only understood about 10% of the talk, but in 2D it looks like an array of hybrid Waveguide junction circulators ( https://en.wikipedia.org/wiki/Circulator https://en.wikipedia.org/wiki/Circulator ). i.e. they are just playing with the pedestals zone normally limited to a narrow range of wavelengths, and fixed at 120' planer signal propagation from S12, S23, and S31. Accordingly, the structure of the plasma poles look like they just setup a complex propagation and interference pattern at key wavelengths. Interesting, I wish I understood the work better, but there are only so many rabbit holes in a talk one can parse. When they started to speculate about crystals my patience was exhausted. Very neat, yet these cheese Goldfish Crackers are more important to me right now =)
  - superkuh 3y ago
    A column of plasma is not like a ferrite because it has no solid shape. While the ions in the plasma exhibit zeeman splitting under an external biasing magnetic field like the ferrites there's no way to set up a stable standing wave around the rim of the ferrite with the amorphous plasma. I don't think there is non-recipocal circulator behavior at work here. http://superkuh.com/standing-wave-circulator.jpg http://superkuh.com/standing-wave-circulator.jpg http://superkuh.com/magnitude-of-electrical-field-around-periphery-of-junction-circulator.jpg http://superkuh.com/magnitude-of-electrical-field-around-per... http://superkuh.com/waveguide-y-junction-circulator.jpg http://superkuh.com/waveguide-y-junction-circulator.jpg
    - Joel_Mckay 3y ago
      I really don't have enough information to argue either way, but I suspect a locally modulated Radix™ 3D printed pedestal cartridge could operate in a similar manner at around 5.8GHz. Even with 10% error in tolerance, such an inexpensive apparatus should still fall squarely into the "worth-a-try" category. =)
tern 3y ago
Incredibly fascinating, thank you!
deleted 3y ago
[deleted]

The logic gates are pretty cool. I'm surprised they went with pure modeling to predict the plasma density in the proprietary cylinder fills. He mentions that the plasma frequency is too low to characterize with optical light but you'd think they could measure the transmission/reflection at the 5 and 6 GHz frequencies (ie those vna plots) and figure it out. Given how sharp he seems in general I'm probably missing something.

Joel_Mckay 3y ago
I only understood about 10% of the talk, but in 2D it looks like an array of hybrid Waveguide junction circulators ( https://en.wikipedia.org/wiki/Circulator https://en.wikipedia.org/wiki/Circulator ). i.e. they are just playing with the pedestals zone normally limited to a narrow range of wavelengths, and fixed at 120' planer signal propagation from S12, S23, and S31. Accordingly, the structure of the plasma poles look like they just setup a complex propagation and interference pattern at key wavelengths. Interesting, I wish I understood the work better, but there are only so many rabbit holes in a talk one can parse. When they started to speculate about crystals my patience was exhausted. Very neat, yet these cheese Goldfish Crackers are more important to me right now =)
- superkuh 3y ago
  A column of plasma is not like a ferrite because it has no solid shape. While the ions in the plasma exhibit zeeman splitting under an external biasing magnetic field like the ferrites there's no way to set up a stable standing wave around the rim of the ferrite with the amorphous plasma. I don't think there is non-recipocal circulator behavior at work here. http://superkuh.com/standing-wave-circulator.jpg http://superkuh.com/standing-wave-circulator.jpg http://superkuh.com/magnitude-of-electrical-field-around-periphery-of-junction-circulator.jpg http://superkuh.com/magnitude-of-electrical-field-around-per... http://superkuh.com/waveguide-y-junction-circulator.jpg http://superkuh.com/waveguide-y-junction-circulator.jpg
  - Joel_Mckay 3y ago
    I really don't have enough information to argue either way, but I suspect a locally modulated Radix™ 3D printed pedestal cartridge could operate in a similar manner at around 5.8GHz. Even with 10% error in tolerance, such an inexpensive apparatus should still fall squarely into the "worth-a-try" category. =)

tern 3y ago

Incredibly fascinating, thank you!

deleted 3y ago

[deleted]