Types, Working Principle, Plasmon
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
The optoelectronic switching devices are very useful for computing and light activated logic gates applications. Optical photonic switching refers to a phenomenon in which transmission of an optical field through a device is switched among two or more possible states by optical means.
Different of Electro Optic Modulators
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
These are used to modulate the intensity or phase of light by an electric field. The different electro optic modulators are (a) Electrooptic modulators based on Kerr effect. (b) Electrooptic modulators based on Pockels effect. (c) Electro absorption modulator by Franz Keldysh and stark effect. (d) Quantum well electro absorption modulator.
Optical Properties of Materials
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
The field of study in which the matter responds in a non linear on linear manner to the incident light radiation is known as non linear optics. The term nonlinear refers to a situation where the cause and effect are not linearly proportional to each other.
Optical Properties of Materials
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
Isotropic transparent materials such as glass do not exhibit double refraction under ordinary circumstances. However, they acquire the optical properties of a uniaxial crystal under the action of external forces. Consequently, they exhibit double refraction.
Construction, Working Principle, Band Structure diagram, Advantages, Drawbacks, Applications
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
The two bands are separated by the bandgap. The Organic semiconductor materials have HOMO and LUMO bands like valence and conduction bands in inorganic semiconductors (Si, Ge, GAs etc). This gives a "single-electron energy-momentum" relation
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
In the last 1980s the interest in organic semiconductors demonstrated by the invention of electroluminescent devices and FETs made from polythiophene.
Construction, Working Principle, Characteristics, Energy Band diagram, Advantages, Disadvantages, Applications, Uses
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
It is a specially fabricated pn junction diode. This diode emits laser light when it is forward - biased.
Construction, Working Principle, VI Characteristics, Circuit, Symbol, Energy Band diagram, Advantages, Disadvantages, Applications, Uses
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
It is a p-n junction diode which emits light when it is forward biased.
Construction, Working Principle, VI Characteristics, Efficiency, Energy Band diagram, Advantages, Disadvantages, Uses
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
It is a P-N junction diode which converts solar energy (light energy) into electrical energy.
Definition, Types, Examples, Energy Band diagram, Efficiency
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
For processing the light signal at the receiver end of the fibre link we require a device to convert the light signals to electrical wave forms. This task is done by the photo-detectors.
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
The term "Well" refers to a semiconductor region that is grown to possess a lower energy, so that it acts as a trap for electrons and holes.
Optical Properties of Materials
Subject and UNIT: Physics for Electronics Engineering: Unit IV: Optical Properties of Materials
The optical intensity (which is the photon flux multiplied by the photon energy h v) falls as the wave travels. The electrons are pumped in the conduction band and holes in the valence band. The electron-hole recombination process (photon emission) can be stronger than electron-hole generation (photon absorption).