JavaScript isn't enabled in your browser, so this file can't be opened. Enable and reload.

1 of 22

Scattering

2 of 22

Blue sky

Sunset

3 of 22

-Scattering by refraction (reflection+transmission) + Absorption (bandgap, HOMO..)

-Geometric scattering (Snell’s law, reflection law..)

4 of 22

-Color dispersion by prism ->Refractive index difference by wavelength

DMSO

EtOH

5 of 22

Wave can affect scattering..

Thin film interefence can occur when the thickness of layer = a*wavelength

a=1/2, 1, 3/2, 2, 5/2 …

Then how about the prism has the similar size to wavelength? Or less than wavelength?

6 of 22

Scattering efficiency

Scattering Parameters=2πr/λ

Optical

MIE

Rayleigh

7 of 22

8 of 22

Scattering efficiency

Scattering Parameters=2πr/λ

Optical

MIE

Rayleigh

λred >λblue

Red

Blue

Blue is more scattered.

9 of 22

Polymer film

Metal

Refraction(scattering) vs Reflection

10 of 22

Polymer

particles

Metal

powder

Many refraction… -> Reflection

Many reflection… -> absorption

11 of 22

Cloud

Nickel nanopowder

Nickle

Water

12 of 22

Textile, MIE scattering? Optical scattering? Rayleigh scattering?

If we want to have high scattering efficiency on 1000 nm, then which diameter for fibers?

13 of 22

14 of 22

15 of 22

16 of 22

Rayleigh scattering

Helmhotz equation

17 of 22

18 of 22

Textile structure

19 of 22

Mie scattering

Qext=Qscat+Qabs

These can be calculated with the simulations.

20 of 22

Absorption material

Beer’s Law