Register to reply

Definition of nonlinear media

by Niles
Tags: definition, media, nonlinear
Share this thread:
Niles
#1
Nov28-10, 09:19 AM
P: 1,863
Hi

From Wiki (http://en.wikipedia.org/wiki/Nonlinear_optics): "Nonlinear optics (NLO) is the branch of optics that describes the behaviour of light in nonlinear media, that is, media in which the dielectric polarization P responds nonlinearly to the electric field E of the light."

My question is: In principle, all media are nonlinear in the sense that we can Taylor expand the potential of the electrons, but whether a material behaves linearly or not depends only on the incoming field. Don't you agree?
Phys.Org News Partner Physics news on Phys.org
Technique simplifies the creation of high-tech crystals
Working group explores the 'frustration' of spin glasses
New analysis of oxide glass structures could guide the forecasting of melt formation in planetary interiors
Dr Lots-o'watts
#2
Nov28-10, 10:35 AM
P: 674
Whether a medium is non-linear or not depends on the magnitude of the taylor series coefficients (chi(1), chi(2), chi(3) ...).

The induced polarization depends on both the material (the chi's) and the incident field.

Sure all media could be said to be non-linear, but when chi(x>1) are so close to zero as to be unmeasurable, the term becomes inappropriate, and we fall back in regular electromagnetism.
shawl
#3
Nov28-10, 10:52 PM
P: 63
I agree with Dr Lots.

You may find the answer in the nonlinear physics books.


Register to reply

Related Discussions
Maxwell's Equations for nonlinear media Classical Physics 13
Numerical solutions of system of nonlinear algebraic equations nonlinear algebraic eq General Math 6
The Media General Discussion 8
Media Bias - Is the media becoming more conservative? Current Events 59