EE 438/538 Optoelectronic Devices & Applications

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Dipole Radiation: The Importance• Electromagnetic (EM) waves generated by atoms excited by another EM wavecan be very accurately modeled with this dipole radiation model even thoughthe underlying physics are differentDipole Radiation: Too Ugly for Practical Use?I agree.But, just step back a littlefrom the source and youcan see that a large portionof the radiation patterncan be approximated by aspherical waver E rorE = r ⋅cos( ωt− k ⋅)
Spherical Wave & Plane Wave• The nicely shaped wave form of the spherical wave helps definingnew conceptsWave front‐ a.k.a. phase front‐ Surfaces with constant phaseWavevector k‐ magnitude: 2π /λ (propagation constant)‐ direction: normal to the phase front• Even farther away from the source? You will see a plane wave!Plane wave‐ flat phase front‐ k in parallelSpherical wave‐ spherical phase front‐ k in radial directionsrEr r= E ⋅cos( ωt− k ⋅)o
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Page 3: Dipole Radiation Pattern & Features
Page 7: Plane Waves• The angular frequenc

EE 438/538 Optoelectronic Devices & Applications

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