Introduction of Optical Properties of Materials

UNIT - IV

CHAPTER 4

OPTICAL PROPERTIES OF MATERIALS

Introduction -Classification of Optical Materials -Carrier Generation and Recombination Processess -Traps -Colour Centres -Types of Colour Centres -Optical Properties of Materials - Optical Absorption in Metals -Optical Absorption in Dielectrics (Insulators) - Optical Absorption in Semi-conductors -Luminescence, Fluorescence and Phosporescence -Photo-electric Effect -Photo Current in P-n-junction Diode [Photo Diode] -Solar Cell -Light Emitting Diode (LED) -Dome Shaped Led -Organic Led [OLED] -Laser Diode (Gaalas-laser) Optical Data Storage Techniques -Data Storage in Cd/dvd's - Differences Between Magnetic Storage Devices and Optical Storage Devices -Holography Differences Between a Photography and Holography

INTRODUCTION

In this computer world, optics plays a vital role in processing the information from one place to another. This leads to the design of opto (light)-electronic (electrons) devices which process the information faster, accurate and at low cost, consuming less space.

The interaction between electrons and photons in a material is the basis of all opto-electronic devices.

Thus, optical materials are the materials in which the conductivity is increased due to photons falling on it. They are used in opto-electronic devices such as cathode ray tube (CRT), light emitting diode (LED), liquid crystal display (LCD), LASER, Quantum dot laser, Photo detectors, computers, calculators etc.. The optical properties of the materials makes us to understand the interaction between the electrons and photons.