EEE 537 L6 Light Propagation in Waveguides

EEE 537 L6 Light Propagation in Waveguides - Chapter 3...

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Unformatted text preview: Chapter 3 Light Propagation in Waveguides i fi it l l t fi it t i t d t From infinitely large space to finite, restricted geometry; Guide (restrict) wave in one or two directions, while propagating in the rest of direction (s): waveguides Planar Waveguide/ l i l b id Plasmonic slab waveguide Rectangular or Linear Waveguide Cylindrical Waveguide EEE537 Fall 2010, ASU ECEE C.Z. Ning (dielectric or dielectric/metallic) 1 Planar Waveguides: Geometric Optics Approach We have shown that the geometrical optical relationships can be obtained from Maxwell equations, thus wave optics I. Cladding layer, n 3 II. Core layer, n 1 III. Cladding layer, n 2 X Y Z Waveguide can form through total internal reflection if Symmetric waveguide, if n 2 =n 3 EEE537 Fall 2010, ASU ECEE C.Z. Ning 3 1 2 1 n n and n n > > 2 Cylindrical Waveguides: Optical Fibers n r1 n r1 n r1 n n n r n d ~ 9 m d ~ 50 m r2 r2 r2 ultimode Multimode EEE537 Fall 2010, ASU ECEE C.Z. Ning Single Mode fiber Multimode step index fiber graded index fiber 3 Reflected waves under total reflection conditions A C 1 1 1 1 2 2 B 2 1 > 2 Please note the notation change from to 1 and to 2 The amplitude ratio of reflected and incident waves: plitude reflection coefficient from dense to rarer media C r = amplitude reflection coefficient from dense to rarer media There is also a sign change EEE537 Fall 2010, ASU ECEE C.Z. Ning A 4 Amplitude Reflection for TE Polarization (1)...
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This note was uploaded on 01/02/2012 for the course ECE 537 taught by Professor Czning during the Fall '10 term at ASU.

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EEE 537 L6 Light Propagation in Waveguides - Chapter 3...

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