Optical Properties of Nanomaterials 02: The complex refractive index
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- Опубликовано: 19 сен 2024
- Lecture by Nicolas Vogel. This course gives an introduction to the optical properties of different nanomaterials. We derive fundamental relations describing the interactions between materials and electromagnetic radiation and discuss the resulting optical properties for dielectric, metallic and semiconducting particles.
This chapter introduces light matter interactions in general, provids a short overview of the required physics to describe them and then discusses the complex nature of the refractive index via the interaction of light waves witgh matter.
Learn more about optical properties of colloid al particles at:
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Institute of Particle Technology at Friedrich-Alexander-Universität Erlangen-Nürnberg:
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Department of Chemical and Biological Engineering at Friedrich-Alexander-Universität Erlangen-Nürnberg:
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Wonderful and well condensed lecture on the derivation of refractive index from wave equation, thank you so much!
Excellent lecture!!!
In minute 16:14, the equation of light speed c should be c = ν * λ instead of c = ν / λ. My apologies
Thanks!
I was recently reading that the _effective_ refractive index of the material also depends on the angle of incidence, in materials where κ>0, noticeable when κ/n exceeds around 0.1.
One of the interesting effects being that it's possible for the angle of refraction/transmission to be the same as the angle of incidence in some materials, at certain angles.
Thank you so much! I was really wondering what the complex refractive index means and it's origin. Really helpfull!
At 2:50 the phenomenon of splitting of white light into different components is called dispersion, you have said diffraction.
Thanks a lot for spotting this - absolutely correct!
The bending of light is refraction. So the splitting is due to refraction. Dispersion is that the phase velocity depends on frequency.So, yes, the splitting depends upon dispersion.
Ein ganz hervorragendes Video. Danke
Great lecture. Thanks!
Ok, thank you!
where is the lecture about dispersion relation???
47:12, 47:53 I think you said something wrong. You said that when the wave goes into the material, the frequency changes. However, omega is a constant everywhere along the equations. Besides the amplitude, what is actually changing is the wave number.
Many thanks for pointing this out. Indeed, it is the wavelength that changes when the wave enters the material, not the frequency.
why is there no change in frequency? Doesn't frequency depend on its wavelength? (dispersion relation)
@@한두혁 Whan traversing from one media to another, the frequency remains constant, while the speed and the wavelength adjust according to the dispersion relation.
v should be the speed of wave in x direction ; dy/dt represent the velocity of the place in y direction .Particle velocity is different than a wave velocity.