Lect. 12: Oblique Incidence at Dielectric Interface

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1 E r Lec. : Oblque Incdence a Delecrc Inerface (Cheng 8-0) Perpendcular Polaraon E E ep( j)ep( j) H r ε,μ ε,μ θ r θ E E H Er E ep( jr)ep( jr) E E ep( j)ep( j) E H ( cos sn ) ep( j)ep( j) E Hr ( cosr sn r) ep( jr)ep( jr) E H ( cos sn ) ep( j)ep( j) H Unknowns :,,, r E&M (4/) W.-Y. Cho

2 Lec. : Oblque Incdence a Delecrc Inerface E r H r ε,μ ε,μ E B.C.'s a 0 ) E counuous (E Er E ) an θ r θ H ep( j ) ep( j ) ep( j ) r ( a) and (b) r E H From : an all dencal r E E ep( j)ep( j) Er E ep( jr)ep( jr) E E ep( j)ep( j) sn sn and sn sn r Wh and n r n sn n sn : Snell's Law E&M (4/) W.-Y. Cho

3 Lec. : Oblque Incdence a Delecrc Inerface Snell's Law: n sn n sn E&M (4/) W.-Y. Cho

4 Lec. : Oblque Incdence a Delecrc Inerface E r H r ε,μ θ r ε,μ θ E H B.C.'s a 0 ) H connuous an cos cos cos E H E&M (4/) E H ( cos sn ) ep( j)ep( j) E Hr ( cos sn ) ep( j)ep( j) E H ( cos sn ) ep( j)ep( j) Wh, /cos /cos /cos /cos /cos /cos /cos W.-Y. Cho

5 Lec. : Oblque Incdence a Delecrc Inerface H r E r ε,μ ε,μ E /cos /cos /cos /cos θ r θ H /cos /cos /cos E H Remember for normal ncden (Lec. ) η η η η, τ η η η Wh oblque ncdence for perpendcular polaraon, cos cos E&M (4/) W.-Y. Cho

6 Lec. : Oblque Incdence a Delecrc Inerface Hr Er 0, 0 E θr θ H 4 0, 0 sn sn(0 ) , = E H For 0 Incden and Transmed Waves E&M (4/) W.-Y. Cho

7 Lec. : Oblque Incdence a Delecrc Inerface Hr Er 0, 0 E θr θ H 4 0, , = E H For 0 Refleced and Transmed Waves E&M (4/) W.-Y. Cho

8 Lec. : Oblque Incdence a Delecrc Inerface Hr Er 0, 0 θr θ H 4 0, , = E H 9.85 For 0 E Toal and Transmed Waves E&M (4/) W.-Y. Cho

9 Lec. : Oblque Incdence a Delecrc Inerface Parallel Polaraon H H ep( j)ep( j) H r ε,μ ε,μ E H r H r ep( j r)ep( j r ) E r H H H ep( j )ep( j ) θ r θ E ( cos sn ) H ep( j)ep( j ) E Er ( cosr sn r ) H r ep( j r)ep( j r) H E ( cos sn ) H ep( j )ep( j ) E H r H H H E E&M (4/) W.-Y. Cho

10 Lec. : Oblque Incdence a Delecrc Inerface E r Parallel Polaraon H r ε,μ ε,μ E H E H r H H H E E H θ r θ H H ep( j)ep( j) H r ( ) H ep( j r )ep( j r ) H j j ) H ep( )ep( E ( cos sn ) H ep( j)ep( j) Er ( cosr sn r ) H ( ) ep( j r )ep( j r ) E ( cos sn ) H ep( j )ep( j ) E&M (4/) W.-Y. Cho

11 Lec. : Oblque Incdence a Delecrc Inerface H r E B.C.'s a 0 E r E θ r ε,μ ε,μ θ H ) H counuous ( H H H ) an r ep( j ) ep( jr) ep( j) ( a) and (b) r H From : all dencal r an H H ep( j)ep( j) H r ( ) H ep( j r)ep( j r ) ep( )ep( ) H H j j sn sn and sn sn r Wh and n r n sn n sn : Snell's Law E&M (4/) W.-Y. Cho

12 Lec. : Oblque Incdence a Delecrc Inerface H r E B.C.'s a 0 E r ε,μ ε,μ H ) E connuous an θ r θ cos cos cos E H ll cos cos cos cos Wh,, cos ll cos cos E ( cos sn ) H ep( j)ep( j) Er ( cosr sn r ) H ( )ep( j r)ep( j r) E ( cos sn ) H ep( j )ep( j ) E&M (4/) W.-Y. Cho

13 Lec. : Oblque Incdence a Delecrc Inerface E r H r ε,μ ε,μ E H ll cos cos cos cos, cos ll cos cos E H θ r θ Remember for normal ncden (Lec. ) η η η η, τ η η η Wh oblque ncdence for parallel polaraon cos, cos E&M (4/) W.-Y. Cho

14 Lec. : Oblque Incdence a Delecrc Inerface 4, and 0 4, and 0 4 and -, Perpendcular 4, and Polaraon 4, Parallel and Polaraon , 0.354, E&M (4/) , 0.3, W.-Y. Cho

15 Lec. : Oblque Incdence a Delecrc Inerface, and :from 0 o 90 Perpendcular Do ou see an dfference? Parallel E&M (4/) W.-Y. Cho

16 Lec. : Oblque Incdence a Delecrc Inerface, and :from 0 o 90 Refleced and Transmed Waves onl Perpendcular Do ou see an dfference? Parallel E&M (4/) W.-Y. Cho

17 Lec. : Oblque Incdence a Delecrc Inerface For a ceran ncden angle, here s no reflecon for parallel polaraon Brewser angle E&M (4/) W.-Y. Cho

18 Lec. : Oblque Incdence a Delecrc Inerface For /cos /cos 0 /cos /cos cos 0 cos n cos n cos, Bu n sn n sn No ess. (Snell's law) E&M (4/) W.-Y. Cho

19 Lec. : Oblque Incdence a Delecrc Inerface For ll cos cos 0 cos cos cos cos 0 n cos n cos and n sn n sn n n n n n n sn and cos an n n For he prevous demo, an 54.7 For delecrc maerals, Brewser angle ess onl for parallel polaraon (Assumng ) E&M (4/) W.-Y. Cho

20 Lec. : Oblque Incdence a Delecrc Inerface (anmaon) - Incden sun lgh has boh perpendcular and parallel polaraon - A Brewser angle, onl perpendcular polaraon ges refleced - A polarer can block lgh wh ceran polaraon - Then, reflecon can be enrel blocked E&M (4/) W.-Y. Cho

21 Lec. : Oblque Incdence a Delecrc Inerface Homework (Due 0/8) (a) Deermne β. (b) Deermne H. (c) Wha s θ, he ransmsson angle? (d) Deermne he epresson for he refleced E-feld. E&M (4/) W.-Y. Cho

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