LECTURE 23 Optical properties

LECTURE 23 Optical properties - Dr. P. Lucas U of A MSE 110...

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Unformatted text preview: Dr. P. Lucas U of A MSE 110 Optical properties of materials When light enters a solid, it can be partly reflected at the surface, transmitted through, absorbed or scattered. The reflectivity R represent the fraction of incident light reflected at the interface. It increases with the refractive index n: The refractive index represent the ability of the material to polarize under an oscillating electric field and how this interaction slows down the light wave propagating in a material: The refractive index of a material increases with density. In contrast to a glass or a monocrystal, a polycrystalline material appears opaque or translucent due to multiple internal reflection. The incident electromagnetic wave induces an oscillating electronic cloud which re-emits or scatters light in all directions. The light scattering efficiency increases for small wavelength and produces the blue color of the sky. SUMMARY FROM LAST CLASS 2 1 1 + = = n n I I R o R v c n = = o S I a I 4 = Dr. P. Lucas U of A MSE 110 Absorption The absorbance is the fraction of light lost through absorption of photons by atoms in the material. OPTICAL PROPERTIES OF MATERIALS The magnitude of ( ) is a function of the light wavelength. Materials only absorb a range of wavelength. This defines their transparency domain. I o I The absorbance is a function of the path length through the sample and the absorption coefficient ( ) of the material....
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This note was uploaded on 10/06/2009 for the course MSE 110 taught by Professor Lucas during the Spring '08 term at University of Arizona- Tucson.

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LECTURE 23 Optical properties - Dr. P. Lucas U of A MSE 110...

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