Insights Blog
-- Browse All Articles --
Physics Articles
Physics Tutorials
Physics Guides
Physics FAQ
Math Articles
Math Tutorials
Math Guides
Math FAQ
Education Articles
Education Guides
Bio/Chem Articles
Technology Guides
Computer Science Tutorials
Forums
General Engineering
Mechanical Engineering
Electrical Engineering
Aerospace Engineering
Nuclear Engineering
Materials Engineering
Trending
Featured Threads
Log in
Register
What's new
Search
Search
Search titles only
By:
General Engineering
Mechanical Engineering
Electrical Engineering
Aerospace Engineering
Nuclear Engineering
Materials Engineering
Menu
Log in
Register
Navigation
More options
Contact us
Close Menu
JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.
You are using an out of date browser. It may not display this or other websites correctly.
You should upgrade or use an
alternative browser
.
Forums
Engineering
Electrical Engineering
Why is dielectric material used for anti-reflective coating?
Reply to thread
Message
[QUOTE="the student, post: 5486911, member: 595523"] Wave reflection is directly proportional to the thickness of the dielectric material.The interference effects in the coating cause the wave reflected from the anti-reflection coating top surface to be out of phase with the wave reflected from the semiconductor surfaces. Most [URL='https://en.wikipedia.org/wiki/Insulator_%28electricity%29']insulators[/URL] (or [URL='https://en.wikipedia.org/wiki/Dielectric']dielectric[/URL] materials) are held together by [URL='https://en.wikipedia.org/wiki/Ionic_bond']ionic bonds[/URL]. Thus, these materials do not have free [URL='https://en.wikipedia.org/wiki/Conduction_electrons']conduction electrons[/URL], and the bonding electrons reflect only a small fraction of the incident wave. The remaining frequencies (or wavelengths) are free to propagate (or be transmitted). This class of materials includes all [URL='https://en.wikipedia.org/wiki/Ceramic_materials']ceramics[/URL] and [URL='https://en.wikipedia.org/wiki/Glass']glasses[/URL]. If a dielectric material does not include light-absorbent additive molecules (pigments, dyes, colorants), it is usually transparent to the spectrum of visible light. Color centers (or dye molecules) in a dielectric absorb a portion of the incoming light wave. The remaining frequencies (or wavelengths) are free to be reflected or transmitted. Any other materials cannot be used because they are light absorber and will not reflect light. [/QUOTE]
Insert quotes…
Post reply
Forums
Engineering
Electrical Engineering
Why is dielectric material used for anti-reflective coating?
Back
Top