Re: backward ray tracing

On Feb 21, 7:31 pm, Phil Hobbs
Helpful person wrote:
I believe that thin films with absorbing (metal) layers are not the
same if reversed.

As Prof. S. pointed out, you have to replace loss with gain when you do
the time reversal.

Cheers,

Phil Hobbs

I'm not familiar with Prof S., probably after my time. However, I can
imagine how the mathematics could be made to work. (Brings to mind
negative refractive indices after reflections.)
.

Relevant Pages

  • Re: Low noise transistors
    ... Phil Hobbs wrote: ... I need to be able to measure their noise under bias. ... running at a voltage gain of about 250, ... still the BJT noise champions at low source resistance? ...
    (sci.electronics.design)
  • Re: Voltage Gain Switch (Design Help)
    ... Phil Hobbs ha escrito: ... The analogue switches will have some nonlinearity and some ... impedance passive attenuator, followed by a gain-of-50 output stage. ... There'll be no bandwidth change with gain, ...
    (sci.electronics.design)