凝聚態(tài)光物理學(xué)ppt課件(參考版)
2025-01-20 15:48本頁面
【正文】 Fully quantum: both atoms and light are treated quantum mechanically. Characteristic optical physics in the condensed matter Exercises: 1. The plex refractive index of germanium at 400 nm is given by . Calculate for germanium at 400 nm: (a) the phase velocity of light, (b) the absorption coefficient, and ( c) the reflectivity. 2. Show that the optical density (.) of a sample is related to its transmission T and reflectively R through: Hence explain how you would determine the optical density by making two transmission measurements, one at wavelength ? where the material absorbs, and the other at a wavelength ?’ where the material is transparent. ~ in ??).1(l o g2)(l o g.. 1010 RTDO ????。 … … many optical effects related to these … … Microscopic models Classical : Treat both the medium and the light according to classical physics。 exciton: formed from delocalized electrons and holes in semiconductors。 Absorption spectrum of the polyfluorenebased polymers F8. Conjugated polymers such as F8 luminesce strongly when electrons are promoted into the excited states of the molecule. The lumi nescence is Stokes shifted to lower energy pared to absorption, and typically occurs in the middle of the visible spectral region. The emission wavelength can be tuned by small alternation to the chemical structure of the molecular unit within the polymers. The property has been used to develop anic light emitting devices to cover the full visible spectral region. Optical materials Molecular (large anic molecules) Materials What the difference is between condensed matter and atomic or molecular optical physics? Crystal symmetry * long range translational order Electronic bands, delocalized states, … … * point group symmetry Neumann’s principle The measurable property point group symmetry Any macr
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