Lecture 4-optical components - Routing light through an...

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Routing light through an optical system Chem 420 Feb 4, 2010
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Properties of electromagnetic radiation Interference Transmission Refraction Reflection Diffraction Scattering Polarization
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Transmission through materials Compared to vacuum, the velocity of light is reduced when propagating through polarizable media. All electrons are polarizable Refractive index scales how light is slowed: Refractive index is wavelength dependent for many materials i i c n v =
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Refraction Snell’s law: 1 2 2 1 sin sin n n θ =
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Reflection Reflected intensity at an interface increases with refractive index mismatch. For right angle: Angle dependent ( 29 ( 29 2 2 1 2 0 2 1 r n n I I n n - = +
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Diffraction Consequence of interference sin integer m d m λ θ = =
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Essential optical elements Lenses Mirrors Prisms Filters Gratings
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Lenses Characterized by their focal length. The efficiency of light collected is defined by the solid angle between the object and the optic – described by the f-number. ( 29 ( 29 1 2 1 1 1 1 n f R R λ = - - /# l f d =
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Basic optical components Mirrors Reflection Concave mirror is converging Convex mirror is diverging Prisms Refraction Snell’s Law 1 1 2 2 sin sin n n θ =
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Filters Absorption filters Cheap, visible region, colored glass Cuttoff filters—long- and short-pass Interference filters (Fabry-Perot) 2 cos 2 interger air d m n dn m m λ θ = = = =
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Lecture 4-optical components - Routing light through an...

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