Effective refractive index when two transparent medium are joined in s

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Discussion Overview

The discussion revolves around the effective refractive index of two stacked transparent media with given thicknesses and refractive indices. Participants explore the calculation methods and underlying principles involved in determining this effective index.

Discussion Character

  • Exploratory, Technical explanation, Debate/contested

Main Points Raised

  • Jayesh inquires about the possibility of calculating the effective refractive index of two layers with specified thicknesses and refractive indices.
  • One participant suggests that defining "effective refractive index" is essential and encourages Jayesh to apply that definition to find the answer.
  • Another participant notes that the calculation is complex and depends on the mode profile, which requires solving wave equations to determine.
  • Claude mentions that once the mode profile is known, the calculation simplifies to an average of the refractive indices, weighted by the mode fraction in each layer.
  • A different participant proposes using transfer matrices to program a solution for multiple layers, providing a link to a resource for further exploration.

Areas of Agreement / Disagreement

Participants express differing views on the complexity of the calculation and the methods to approach it. There is no consensus on a single method or solution.

Contextual Notes

The discussion highlights the dependence on definitions and the need for additional information regarding mode profiles and mathematical approaches, which remain unresolved.

jayeshtrivedi
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Dear All,

If two layers of thickness d1 and d2 stacked on each other and having their absolute refractive index n1 and n2 .

Can we find effective refractive index of the combination with this data?

Thanks in advance.

Jayesh.
 
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Yes, but the calculation is not straightforward, because it depends on the mode profile - which is generally found by solving wave-equations.

Once you know the mode profile, the calculation becomes relatively straightforward, essentially it is just an average of the two indices, weighted by the mode fraction in each layer.

Claude.
 
It is quite easy to program the solution for any number of layers using transfer matrices.
See wikipedia or any promising search result:
http://sjbyrnes.com/fresnel-solver-sourcecode.pdf
 

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