Diffraction -Fresnel and Fraunhofer

Both cases - caused (or explained) by interference of "wavelets"coming from different
positions of an opening
apperture

first: emission from a plane interface, which covers the whole x,y plane

second: emission from parts of the plane (apetures, circular and rectangular)
In the rectangular case: one edge length very long, often infinite;


Important mathematical trick: Weyl's expansion of spherical wave(let)
weyl-spherical


Fresnel cases: quadratic dependence on the distance from the normal (from the "axis" or "the edge")
Linear and quadratic
Fraunhofer cases: large distance; the quadratic term becomes negligible, the linear is important




 Weyl's expansion of spherical wave and Green's functions  (snapshot of the notes)
(Discussion of the Green's function method)


weyl-greensfunct.png



http://wyant.optics.arizona.edu/webMathematica/myprograms/fresnelZones/FresnelDiffraction.pdf
fresnel-pattern.png
( note that the plots below go only to  corresponds to N=2.0; and for N=2 we get darker region in the middle )
Remember that the circular case contains the Bessel function J1(x) where x is quadratic function of the radial distance
fresnel-plot.png
( note that the above situation corresponds to N=2.3 )



Fresnel on edge

fresnel-edge.png
http://cnx.org/content/m13097/latest/
About Airy diskand circular apperture


http://en.wikipedia.org/wiki/Airy_disc
Airy-pattern.png       from http://en.wikipedia.org/wiki/Airy_disc

http://en.wikipedia.org/wiki/Aberration_in_optical_systems




Green's function derivation (last lecture...)


http://en.wikipedia.org/wiki/Bessel_function


Oct 24, 2006

"fresnel diffraction" circular
Fresnel Diffraction.nb  -  3:50pm
wyant.optics.arizona.edu/.../­FresnelDiffraction.pdf
Fresnel diffraction by a circular aperture  -  3:48pm
www.iop.org/EJ/abstract/­0143-0807/8/1/011
EXPERIMENTS ON FRESNEL DIFFRACTION BY CIRCULAR APERTURE ...  -  3:46pm
www.iop.org/EJ/article/­0335-7368/4/6/306/jov4i6p357.pdf
Algorithms for Fresnel Diffraction at Rectangular and Circular ...  -  3:43pm
nvl.nist.gov/pub/nistpubs/­jres/103/5/j35mie.pdf
Fresnel Diffraction--Circular Aperture -- from Eric Weisstein's ...  -  3:41pm
scienceworld.wolfram.com/­physics/FresnelDiffractionCirc...
 
"cornu spiral"
Cornu Spiral -- from Wolfram MathWorld  -  3:28pm
mathworld.wolfram.com/­CornuSpiral.html
 
fresnel diffraction
Fresnel Diffraction Demo: Index  -  3:13pm
www.ph.unimelb.edu.au/­~ssk/fresnel/
 
fraunhofer diffraction
Fraunhofer Diffraction--Circular Aperture -- from Eric Weisstein's ...  -  3:16pm
scienceworld.wolfram.com/­physics/FraunhoferDiffractionC...




Oct 26, 2006
hankel bessel
Bessel function - Wikipedia, the free encyclopedia  -  3:55pm
en.wikipedia.org/­wiki/Bessel_function
INTEGRAL and DISCRETE TRANSFORMS with APPLICATIONS and ERROR ANALYSIS  -  3:55pm
www.clarkson.edu/­~jerria/book2.html
 
aberration
Aberration - Wikipedia, the free encyclopedia  -  3:38pm
en.wikipedia.org/­wiki/Aberration
 
"airy disk"
Airy disc - Wikipedia, the free encyclopedia  -  2:53pm
en.wikipedia.org/­wiki/Airy_disc
Airy Disk -- from Eric Weisstein's World of Physics  -  2:53pm
scienceworld.wolfram.com/­physics/AiryDisk.html