How refractive index change with change in intensity?
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The refractive index of a material can vary as a function of light intensity for several different reasons:
Excitation of Electron-Hole Plasmas
The simplest case to understand is when light illuminates simple semiconductors. The high intensity triggers the formation of electron-hole pairs, which increases the free charge carrier density. According to the Drude model, the permittivity of a material varies as a function of charge carrier density NN, effective mass m∗m∗, scattering rate γγ, and dielectric constant ϵ0ϵ0 as,
ϵ=ϵ0−ω2pω2−γ2ϵ=ϵ0−ωp2ω2−γ2
ω2p=Nq2ϵ0m∗ωp2=Nq2ϵ0m∗
Since the permittivity is related to the refractive index by n=ϵμ−−√n=ϵμ, if the permittivity changes, so does the refractive index.
☆HOPE IT WILL HELP YOU☆
The refractive index of a material can vary as a function of light intensity for several different reasons:
Excitation of Electron-Hole Plasmas
The simplest case to understand is when light illuminates simple semiconductors. The high intensity triggers the formation of electron-hole pairs, which increases the free charge carrier density. According to the Drude model, the permittivity of a material varies as a function of charge carrier density NN, effective mass m∗m∗, scattering rate γγ, and dielectric constant ϵ0ϵ0 as,
ϵ=ϵ0−ω2pω2−γ2ϵ=ϵ0−ωp2ω2−γ2
ω2p=Nq2ϵ0m∗ωp2=Nq2ϵ0m∗
Since the permittivity is related to the refractive index by n=ϵμ−−√n=ϵμ, if the permittivity changes, so does the refractive index.
☆HOPE IT WILL HELP YOU☆
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