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Forum index » Science and Technology » Physics » Electromagnetics
Plane Wave Reflection and Refraction in tern of wave equation (ie: intrinsic impedance, reflection & transmission coefficients) - NOT Snells's law.
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Monty Hall
science forum beginner


Joined: 18 Jul 2005
Posts: 20

PostPosted: Wed Apr 19, 2006 7:13 pm    Post subject: Plane Wave Reflection and Refraction in tern of wave equation (ie: intrinsic impedance, reflection & transmission coefficients) - NOT Snells's law. Reply with quote

Hello,

I was just flipping though my old EM book and have noticed that all examples
of EM plane wave reflection was for normal incidence - boundary conditions
trivial. I was wondering how to compute reflected and refracted waves if
the incidence angle isn't normal.

The closest thing that I saw was Hugyen's principle - plane wave incident @
arbitrary angle - but the reflected and refracted waves are
spherical/cyclindrical and that apparent resultant plane waves of the
reflected and incident waves are a super posistion of all spherical waves.
All I could find are Java applets, any good web resources that step though
the derviation to yield the reflect/refract plane waves?

I'm not interested in Snell's law as I presume that the superposition of an
infinite # of spherical waves ultimately can reduce to Snell's law & law of
reflection. I was kind of thinking that a simple boundary condition would
yield the reflected & refracted wave w/o having to sum an infinite number of
spherical waves or resorting to spherical waves at all.

Regards,

Monty
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Timo Nieminen
science forum Guru Wannabe


Joined: 12 May 2005
Posts: 244

PostPosted: Thu Apr 20, 2006 3:47 am    Post subject: Re: Plane Wave Reflection and Refraction in tern of wave equation (ie: intrinsic impedance, reflection & transmission coefficients) - NOT Snells's law. Reply with quote

On Wed, 19 Apr 2006, Monty Hall wrote:

Quote:
Hello,

I was just flipping though my old EM book and have noticed that all examples
of EM plane wave reflection was for normal incidence - boundary conditions
trivial. I was wondering how to compute reflected and refracted waves if
the incidence angle isn't normal.

The closest thing that I saw was Hugyen's principle - plane wave incident @
arbitrary angle - but the reflected and refracted waves are
spherical/cyclindrical and that apparent resultant plane waves of the
reflected and incident waves are a super posistion of all spherical waves.
All I could find are Java applets, any good web resources that step though
the derviation to yield the reflect/refract plane waves?

I'm not interested in Snell's law as I presume that the superposition of an
infinite # of spherical waves ultimately can reduce to Snell's law & law of
reflection. I was kind of thinking that a simple boundary condition would
yield the reflected & refracted wave w/o having to sum an infinite number of
spherical waves or resorting to spherical waves at all.

Choose a coordinate system with the interface lying in the xy plane
(ie z = 0), with the incident wavevector (and hence the reflected and
transmitted wavevectors as well) in the xz plane. The incident wave is a
plane wave.

Choose either TE or TM polarisation - TE will have E purely in the y
direction, and H in the xz plane, with both x and z components, TM will
have H with only a y component and E with x and z components.

For TE polarisation, the boundary conditions are Ey1 = Ey2 and
Hx1 = Hx2. The x component of the wavevector is also the same in both
mediums.

The refractive index gives you the wavenumber in each medium, and kx then
gives you kz. Note that kz can be imaginary (total internal reflection) or
complex (eg a lossy medium). The impedance in each medium gives you the
relationship between E and H.

--
Timo Nieminen - Home page: http://www.physics.uq.edu.au/people/nieminen/
E-prints: http://eprint.uq.edu.au/view/person/Nieminen,_Timo_A..html
Shrine to Spirits: http://www.users.bigpond.com/timo_nieminen/spirits.html
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