Re: Is electromagnetic field theory unified?

From: Timo Nieminen (timo_at_physics.uq.edu.au)
Date: 03/02/05 

Date: Thu, 3 Mar 2005 08:07:32 +1000

On Wed, 2 Mar 2005, Franz Heymann wrote:

> "Franz Heymann" <notfranz.heymann@btopenworld.com> wrote:
>
> > Maxwell's equations also support inward-ptropagating waves.
> > Admittedly, it would be rather difficult technologically to launch
> > them.
>
> I withdraw that. It is in fact as easy as jam to launch a radially
> inward travelling wave.
> I forgot momentarily about a spherical resonator excited with a TE010
> mode. That consists of simultaneous magnetic dipole waves travelling
> inwards and outwards.

A lens also does the trick quite well.

Of course, to get inward-travelling waves without outward-travelling
waves, you need something in the middle to absorb it. 

-- 
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html

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