What are the two requirements for an anti-reflection coating?

  • Thread starter Thread starter blackphoenix23
  • Start date Start date
  • Tags Tags
    Coating
Click For Summary

Discussion Overview

The discussion revolves around the requirements for an anti-reflection coating, particularly in the context of an electromagnetic fields course. Participants explore the properties and principles that govern the effectiveness of such coatings, including the concept of destructive interference and the materials involved.

Discussion Character

  • Homework-related
  • Exploratory
  • Technical explanation

Main Points Raised

  • One participant inquires about the specific requirements for an anti-reflection coating, noting a lack of clarity on the topic.
  • Another participant suggests that understanding what an anti-reflective coating aims to achieve could lead to identifying its properties.
  • It is mentioned that the goal of anti-reflective coatings is to reduce reflection and maximize light transmission through surfaces like glass.
  • Destructive interference is proposed as a mechanism by which anti-reflective coatings function, though further clarification is sought on the properties involved.
  • Participants discuss the importance of material properties such as refractive index and the conditions for destructive interference, including the behavior of light within the coating.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the specific requirements for anti-reflection coatings, and multiple viewpoints on the properties and principles involved are presented. The discussion remains unresolved as participants seek further clarification and information.

Contextual Notes

There is a noted limitation in the availability of course notes, which affects the ability of participants to reference specific material related to the topic. Additionally, the discussion includes assumptions about the properties of materials and the behavior of light that are not fully explored.

blackphoenix23
Messages
2
Reaction score
0

Homework Statement


What are the two requirements for an anti-reflection coating?


Homework Equations


Not sure there are any.


The Attempt at a Solution


I googled the term anti-reflection coating and I found a wikipedia article on it here. http://en.wikipedia.org/wiki/Anti-reflective_coating

From what I read, I'm not sure what the "requirements" would be. The only thing I found that might hint at what the answer should be is "Many coatings consist of transparent thin film structures with alternating layers of contrasting refractive index." Can anyone help out with this, or clarify what the requirements could be? This is for an electromagnetic fields course if that gives any more of a direction as to what I should be looking for.
 
Physics news on Phys.org
Welcome to PF;
What is an anti-reflective coating supposed to achieve and how do they normally do this?
Translate that into properties and you have your answer... probably you should have a look at your recent course notes for ideas.
 
Simon Bridge said:
Welcome to PF;
What is an anti-reflective coating supposed to achieve and how do they normally do this?
Translate that into properties and you have your answer... probably you should have a look at your recent course notes for ideas.

Well the ultimate goal of them is to reduce reflection which will maximize the amount of light transmitted into a surface (ex. glass). From what I read online this is done by destructive interference. Could you explain what you mean by properties?

Sorry, I would love to review my course notes, but the professor had already removed the course notes for the course and I am redoing a homework set to receive more points so I have nothing to reference from. Any more help in pointing me in the right direction would be appreciated. Thank you.
 
Haven't you already listed one property already - the property of increasing the transmission of light through the lens.
 
blackphoenix23 said:
Well the ultimate goal of them is to reduce reflection which will maximize the amount of light transmitted into a surface (ex. glass).
That's two properties - well done.

From what I read online this is done by destructive interference. Could you explain what you mean by properties?
http://www.thefreedictionary.com/property
Material properties like refractive index, shape, color, size, smell, texture... what would be the important properties for an anti-reflective coating?

Sorry, I would love to review my course notes, but the professor had already removed the course notes for the course and I am redoing a homework set to receive more points so I have nothing to reference from. Any more help in pointing me in the right direction would be appreciated. Thank you.
I see ... by "course notes" I meant the ones you wrote down yourself, not the ones your prof posted online. The reason he removed them because you are expected to have your own by now.

Google for "thin films".
The coating will have two surfaces.
Light is reflected off both surfaces.
If the light reflected from the bottom surface destructively interferes with the light from the top surface, then there will be no reflection.
What is the condition for destructive interference?
What material properties of the film need to be taken into account?
i.e. is the wavelength of the light the same inside the film as on either side of it?
 
Last edited:

Similar threads

Replies
1
Views
2K
Replies
1
Views
2K
Replies
1
Views
2K
  • · Replies 2 ·
Replies
2
Views
1K
Replies
4
Views
3K
  • · Replies 1 ·
Replies
1
Views
2K
  • · Replies 1 ·
Replies
1
Views
1K
  • · Replies 12 ·
Replies
12
Views
2K
  • · Replies 3 ·
Replies
3
Views
3K
Replies
10
Views
6K