Optical-Properties-Lecture

Optical-Properties-Lecture - u v object plane object plane...

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Click to edit Master subtitle style Optical Properties Paulo Ferreira University of Texas at Austin Materials Science and Engineering Program
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How do Materials Interact with Radiation? 1 0 0 0 = + + I I I I I I T A R Reflectivity Absorptivity Transmittability
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How do Materials Interact with Radiation? Reflection specular diffuse x I I β - = exp 0 x x I I I I R β - - = exp 1 2 0 0 Absorption and Transmission
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n 1 n 2 n2>n 1 v 1 v 2 v2<v 1 Electron Optics Geometrical Properties
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Snell’s Law Electron Optics Geometrical Properties 1 2 2 1 2 1 sin sin n n v v = = θ θ
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Electron Optics
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Electron Optics Geometrical Properties collection angle (~ 10 mrads = 0.57o) convergence angle
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Electron Optics Geometrical Properties Lens 1 2 3 object back focal plane image
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Electron Optics Geometrical Properties v u f 1 1 1 + = Lens Equation u v M = Magnification assume u,v > f
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Electron Optics Magnification image plane
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Unformatted text preview: u v object plane object plane image plane u v Electron Optics Demagnification Electron Optics Focus blurred image blurred image α 1> α 2 The Physics of Optical Properties λ ν hc h E ph = = Opaque vs Transparent Metals Dielectrics gap crit E h ∆ = ν Color Fluoroscence vs Phosphorescence Effects of Scale Quantum Effects Conventional Materials (no electron confinement) En=([email protected])/2mL2 where n=1,2, … Nanoscale Materials (electron confinement) Properties of Nanomaterials Optical Properties Band gap shifts towards higher energies (shorter wavelength) CdSe Quantum Dots Applications Polarized Light Internal Reflection Applications dichroics chromics...
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