Abstract
Deposition and Characterization of Various Types of Coatings Development of Humidity Sensor
Highlights
Thin films are deposited on to bulk materials to achieve properties which are unattainable or not attainable in the substrates alone
ANTI REFLECTING COATING Single layer antireflection coating: When a beam m of light traveling in air, refractive index, passes through the a glass plate, refractive index n2,a part of incident light will be reflected on the front an rear sufaces, as shown schematically.The reflectance R of a glass/air interface, defined as, the reflected intensity to the incident intensity,is a function of the difference in the refractive indices of the media and may be expressed for normal incident as: R=(no-n1)/(n0+n1)[2]
With ordinary glass plate n2=1.52 the original beam of light is decreased in intensity by this reflected amount,approximately 4.1%per surface,making total8.2%.If approximate thin films, refractive index n1,are deposited on the surfaces, these reflection can be reduced, resulting in an effective improvement in the transmission of the glass
Summary
Thin films are deposited on to bulk materials (any substrate) to achieve properties which are unattainable or not attainable in the substrates alone. In the present state of science and technology, thin films play an important role in the investigations of the fundamental properties of solids and in revolutionizing the basic concepts, quality and performance of science-based industrial products. They have crossed the frontiers of laboratory investigations and become the backbone of presentday electronic, optical and automotive industries as well as playing a pivotal role in the harnessing of solar energy. The importance of coatings and the synthesis of new materials for industry have resulted in a tremendous increase of innovative thin film processing technologies This development goes hand-in-hand with the explosion of scientific and technological breakthrough in microelectronics, optics and nanotechnology.
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