Physics for Information Science: Unit IV: Optical Properties of Materials
Optical Absorption in Metals
We know that when a metal is exposed to light (example sunlight) then the metal gets heated after some time.
OPTICAL
ABSORPTION IN METALS
We
know that when a metal is exposed to light (example sunlight) then the metal
gets heated after some time. The reason behind this is as follows.
In
metals there are large number of free electrons, these electrons interact with
the optical electric field. Due to this field the motion of electrons are
damped by collisions with the vibrating lattice of the material and hence a
part of energy is dissipated in the form of heat.
Skin depth and skin
layer: When light passes through a metal, its intensity
decreases with respect to the distance through which it propagates through the
metal. Therefore the energy of the light decreases due to the absorption of
light by free electrons.
Thus
the skin depth is the maximum distance upto which an electro-magnetic wave
(light) can travel thereby producing conduction current due to the interaction
of light with free electrons. The conduction current which passes upto a layer
is called Skin layer. (Fig. 4.8).
Note:
The conduction current due to light will produce heat only upto skin layers.
Below the skin layer the heating is produced due to thermal conduction only.
Physics for Information Science: Unit IV: Optical Properties of Materials : Tag: : - Optical Absorption in Metals
Physics for Information Science: Unit IV: Optical Properties of Materials
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Physics for Information Science
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