htg
Full Member level 5
Consider a horizontally propagating Gaussian beam of EM waves of vertical polarization.
Consider a box with rectangular horizontal top and bottom,
and with side walls going in the direction of the electric field E.
Let the box be above the axis of the Gaussian beam.
If the box is tall enough, then the magnitude of flux of E through the bottom
of the box will be much greater than the magnitude of flux through the top.
Since side walls go in the direction of the E field, there will be
zero flux through each of them.
Consider a box with rectangular horizontal top and bottom,
and with side walls going in the direction of the electric field E.
Let the box be above the axis of the Gaussian beam.
If the box is tall enough, then the magnitude of flux of E through the bottom
of the box will be much greater than the magnitude of flux through the top.
Since side walls go in the direction of the E field, there will be
zero flux through each of them.