Abstract:
Theory of waveguide shows that absorption depends on the dimensions of waveguide .This theory utilized to see how one can construct laser system that have efficiency dependent on their dimensions. Nano rectangular waveguide can produce laser under certain conditions. It can produce high frequency electromagnetic wave if the dimensions of the waveguide are become very small to be of the order of the wave length of the incident electromagnetic wave. At low frequency wave can be produced if the amplification factor is proportional to the wave number, frequency, and conductivity of material.
