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Physics 6805: Diffraction 101

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Slides

Diffraction 101 (review?)

Diffraction 101 (review?) Diffraction 101 (review?)
Diffraction 101 (review?) Diffraction 101 (review?) Diffraction 101 (review?)

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Intensity as a Function of Angle

Intensity as a Function of Angle Intensity as a Function of Angle

Single-slit diffraction: first minimum when sin θmin = λ/a ⇒ pattern widens as λ increases.

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Diffraction from a circular hole

Diffraction from a circular hole

The diffraction pattern of a circular hole of diameter d is similar to that of a single slit of width a. The bright spot in the middle is the Airy disk. It has about 85% of the power in the pattern. Minima are at:
sin θ1 = 1.22 λ/d
sin θ1 = 2.23 λ/d
sin θ1 = 3.24 λ/d

What is the diffraction pattern from a solid disk? (Hint: Babinet)

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Diffraction and resolution

Diffraction and resolution

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Wavelength and resolution

Wavelength and resolution Wavelength and resolution Wavelength and resolution
Wavelength and resolution Wavelength and resolution Wavelength and resolution
Wavelength and resolution Wavelength and resolution Wavelength and resolution

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Consequences

Consequences     Consequences

For a slit of width a, θmin = sin-1(λ/a), so if λ>a, you don't learn anything about the details of the slit.

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Quantum Mechanics and Resolving Power

Quantum Mechanics and Resolving Power      Quantum Mechanics and Resolving Power

The de Broglie relation is λ = h/p.
For λ≈10-10m ⇒ probe atoms
For λ≈10-14m ⇒ probe nucleus
For λ≈10-18m ⇒ probe quarks

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Last modified: 02:12 pm, August 21, 2017.
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