Optical Properties of Materials
Subject and UNIT: Physics for Information Science: Unit IV: Optical Properties of Materials
When the atoms in the solid is excited by some means (optical, electrical excitation etc.) and if the atoms return from excited state to the ground state by emitting light
Subject and UNIT: Physics for Information Science: Unit IV: Optical Properties of Materials
When light is allowed to fall over semi-conductors the electrons in the valence band absorb the energy from light and it moves from valence band to conduction band.
Subject and UNIT: Physics for Information Science: Unit IV: Optical Properties of Materials
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.
Subject and UNIT: Physics for Information Science: Unit IV: Optical Properties of Materials
We know that when a metal is exposed to light (example sunlight) then the metal gets heated after some time.
Subject and UNIT: Physics for Information Science: Unit IV: Optical Properties of Materials
When light is made to incident on any material, it interacts with the material and several process, such as transmission, absorption, dispersion, reflection etc., takes place.
Optical Properties of Materials
Subject and UNIT: Physics for Information Science: Unit IV: Optical Properties of Materials
There are different types of colour centres viz., F-centre, F '-centre, R1-centre, R2-centre, M-centre, V-centre etc.
Subject and UNIT: Physics for Information Science: Unit IV: Optical Properties of Materials
Pure ionic crystals like NaCl, KCI etc. are transparent when visible light is passed through them.
Optical Properties of Materials
Subject and UNIT: Physics for Information Science: Unit IV: Optical Properties of Materials
Trap is an intermediate energy level present in the energy gap between the valence band and conduction band, which arises due to the presence of impurity atoms (or) imperfections in the crystal.
Optical Properties of Materials
Subject and UNIT: Physics for Information Science: Unit IV: Optical Properties of Materials
We know the valence electrons for the semiconductors are four. Below the absolute temperature all the four valence electrons are tightly bounded with the central positive nucleus, hence it act as an insulator.
Subject and UNIT: Physics for Information Science: Unit IV: Optical Properties of Materials
Optical materials can be classified into three categories, based on their interaction with visible light, viz.
Subject and UNIT: Physics for Information Science: Unit IV: Optical Properties of Materials
In this computer world, optics plays a vital role in processing the information from one place to another.
Construction, Working Principle, Advantages, Disadvantage, Applications
Subject and UNIT: Physics for Information Science: Unit III: Magnetic Properties of Materials
Hard disk drives [HDD] made up of magnetic garnet materials are called magnetic hard disk drives.