# Photonic local density of states and field intensity

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1. Mar 18, 2015

### Jeffrey Yang

Dear All:

I'm very confusing with the relationship between photonic local density of states and the field intensity. In thermal equilibrium, the field intensity should be proportional to the photon's number (or squared) and also be proportional to the local density of states. We know that this density of states is proportional to the n^3, where n is the refractive index. Meaning if you have larger n, you should have larger field intensity. But actually it's not. If you have larger n, meaning you have larger dielectric function, the dielectric screening will be stronger. Under a same excitation, you should have smaller field intensity.

How to under stand this point?

2. Mar 23, 2015