Physics for Information Science: Unit IV: Optical Properties of Materials
Optical Absorption in Dielectrics (Insulators)
In dielectrics the availability of free electrons (or) conduction electrons is very less and hence, when a dielectric is exposed to light it absorbs the light and the dielectric gets heated very slowly.
OPTICAL
ABSORPTION IN DIELECTRICS (INSULATORS)
In
dielectrics the availability of free electrons (or) conduction electrons is
very less and hence, when a dielectric is exposed to light it absorbs the light
and the dielectric gets heated very slowly. The reason is as follows.
When
light is allowed to fall on a dielectric for a longer time, the covalent bonds are
broken and the electrons in the valence band absorbs the light energy and moves
to conduction band thereby creating a hole in valence band. While it returns
from conduction band to valence band it may radiate the energy in two process.
viz.
(i) Radiative
transition: It is the process in which the electrons in
conduction band recombines with the holes in valence band and reradiate the
energy in the form of light.
(ii) Non-radiative transition:
In this process the electrons in conduction band will have collision with the
lattice points in the dielectric material and thereby radiate the energy in the
form of heat.
In
both the process a part of energy is released in the form of heat and thus the
material is heated.
Physics for Information Science: Unit IV: Optical Properties of Materials : Tag: : - Optical Absorption in Dielectrics (Insulators)
Physics for Information Science: Unit IV: Optical Properties of Materials
Under Subject
Physics for Information Science
PH3256 2nd Semester CSE Dept | 2021 Regulation | 2nd Semester CSE Dept 2021 Regulation
Related Subjects
Professional English II
HS3251 2nd Semester 2021 Regulation | 2nd Semester Common to all Dept 2021 Regulation
Statistics and Numerical Methods
MA3251 2nd Semester 2021 Regulation M2 Engineering Mathematics 2 | 2nd Semester Common to all Dept 2021 Regulation
Engineering Graphics
GE3251 eg 2nd semester | 2021 Regulation | 2nd Semester Common to all Dept 2021 Regulation
Physics for Electrical Engineering
PH3202 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Basic Civil and Mechanical Engineering
BE3255 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Electric Circuit Analysis
EE3251 2nd Semester 2021 Regulation | 2nd Semester EEE Dept 2021 Regulation
Physics for Electronics Engineering
PH3254 - Physics II - 2nd Semester - ECE Department - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Electrical and Instrumentation Engineering
BE3254 - 2nd Semester - ECE Dept - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Circuit Analysis
EC3251 - 2nd Semester - ECE Dept - 2021 Regulation | 2nd Semester ECE Dept 2021 Regulation
Materials Science
PH3251 2nd semester Mechanical Dept | 2021 Regulation | 2nd Semester Mechanical Dept 2021 Regulation
Basic Electrical and Electronics Engineering
BE3251 2nd semester Mechanical Dept | 2021 Regulation | 2nd Semester Mechanical Dept 2021 Regulation
Physics for Civil Engineering
PH3201 2021 Regulation | 2nd Semester Civil Dept 2021 Regulation
Basic Electrical, Electronics and Instrumentation Engineering
BE3252 2021 Regulation | 2nd Semester Civil Dept 2021 Regulation
Physics for Information Science
PH3256 2nd Semester CSE Dept | 2021 Regulation | 2nd Semester CSE Dept 2021 Regulation
Basic Electrical and Electronics Engineering
BE3251 2nd Semester CSE Dept 2021 | Regulation | 2nd Semester CSE Dept 2021 Regulation
Programming in C
CS3251 2nd Semester CSE Dept 2021 | Regulation | 2nd Semester CSE Dept 2021 Regulation