Lecture 3 - Optical Properties of Bulk and Nano

Lecture 3 - Optical Properties of Bulk and Nano - Lecture 3...

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Unformatted text preview: Lecture 3: Optical Properties of Bulk and Nano 5 nm Course Info First H/W is due Sept. 15 The Previous Lecture Origin frequency dependence of χ in real materials • Lorentz model (harmonic oscillator model) ( 29 n ϖ ' n '' n ' 1 n = ucleus e- + ϖ Today optical properties of materials • Insulators (Lattice absorption, color centers…) • Semiconductors (Energy bands, Urbach tail, excitons …) • Metals (Response due to bound and free electrons, plasma oscillations.. ) ϖ ϖ Nucleus Optical properties of molecules, nanoparticles, and microparticles Classification Matter: Insulators, Semiconductors, Metals Bonds and bands • One atom, e.g. H. Schrödinger equation: • Two atoms: bond formation E H + H + H + ? • Equilibrium distance d (after reaction) Every electron contributes one state Classification Matter eV ~ 1 eV • Pauli principle: Only 2 electrons in the same electronic state (one spin & one spin ) Classification Matter Empty outer orbitals Outermost electrons interact Atoms with many electrons Partly filled valence orbitals Filled Inner shells Distance between atoms Energy Electrons in inner shells do not interact Form bands Do not form bands Classification Matter Insulators, semiconductors, and metals • Classification based on bandstructure Dispersion and Absorption in Insulators Electronic transitions Atomic vibrations No transitions 3.0 3.4 index: n’ Refractive Index Various Materials 2.0 1.0 0.1 1.0 10 λ ( μ m ) Refractive in Color Centers...
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Lecture 3 - Optical Properties of Bulk and Nano - Lecture 3...

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