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PQ ?Ml ' ? ?V  ? v ê b ?BV?? %? ¤ l?￥?? àμ üA￥M? oμ? ? ?@l H ? 7 SC ? üA￥M?b?V üQ  ?   ?1T¨￥ ^?W￥B?sb ? ? ?0_B?Z_ êl 1 ?_P êlb ? ê ?B??  a D5 ˉμo$Q ? %? ? ^ ?íE A? 4 4￥ ? · a ü?0  Q  ?l￥B?s7?B?s ?c;÷￥?1? Mirror S 4 a?^ ;D ?=c ;￥o? ? b § 2.1? ?;o#  í ? B;o? μ HW? bW ×? ù? o??￥.lb?? bW￥.l??t ?  bW￥s???o?b o?? ?B? μ??￥? ù? ??￥t ? üVB? HWa? V[?ˉe ?￥ ? ′' μ HW￥? ù?¨??￥? ù T í ? b ?B H Yo? bWs?￥? ù?'t ?  bW? ùs?¨oé λ í ?b ?[o￥Vr T A? ?] HQ? HW? bW￥? ù?b ??o ^??￥.l ?[ o￥Vr Tü ^1Q?B???  't ?  ê ?  ü?ê?￥?  bW ^ ??.l ￥b V[1¨?o￥ í ?Z TbKe?￥ ^e~o ?T bWB? ￥??Vr T1 0 z )cos(),( 00 ?ω += tAtzU o[ ? .l? ?B?v zoV .? 0 z z￥ HW W?1 v 0 zz t ? =? 5??￥??1 L=  ^ ? 0 z t? HW -￥??#μ ])(cos[),(),( 00 ?ω +??=??= ttAttzUtzU ]cos[ 0 0 ?ωω + ? ?= v zz tA ]2cos[ 0 0 ? νλ πνω + ? ?= zz tA ])( 2 cos[ 00 ? λ π ω +??= zztA 5 a?^ ;D ?=c ;￥o? ? | 1e?0 0 =z k= λ π2 5μ )cos(),( 0 ?ω +?= kztAtzU  T ^o?? ???￥Vr T ?? ^o??￥ ?iB? ?[  T í ? ??o ?￥??ü ^e~o￥Vr Tb z z B?￥o V[¨ ??f ?V U1 ]cos[)(),( 0 ?ω +?= kxtPAtPU  ?V U1 ]cos[)(),( 0 ?ω ′+?= tkxPAtPU ? 00 ?? ?=′ $?TêM' S H Ye?￥??b V U zZ _.l￥??ob ω = λππν c22 = ν  ?ê HW =??￥Q ? ' ? q ω π2 HW =￥ ? q ? 1? ? q ? ? q λ 1 ?êé =￥ bW? ù ? ' bW ? q $?1o ? k π2 é =￥ bW ? q λ π2 =k ?o ? ?o ? b )( 0 Ptkzt ?ω?ω ?=+? ?1o￥êMD HW? bWM1b B?êM′??o ￥B? oVB?.l? 6B? ü ^|o ￥B?  Lü ^ ??  't ?  ê ? ü?ê?￥vl VB?.l? 6B? êMü ^ í ?o B?￥t ? bB o ￥B?¨·B￥B?êM í ?.lV??o B?￥êM ??Mb ?? | %?êM ?[??￥.lü ^êM￥.lb =;o ^ O o èHo 1è?s  aH?s ao￥.lZ_'o Ob 2o O nnk GG G , 2 λ π = .lZ_￥?ê O b 3è?s  ??aH?s ??aoéa ? q? ^S b ; ? =v εμ/1 = 00 /1 μμεε rr = rr c με/ 00 /1 με=c 1? b?￥; ?b |  q rr vcn με== / ?i;￥oé r μ ?# r n ε≈ b ;￥ ? ¨ ? @ áa' á?S O V U1 6 a?^ ;D ?=c ;￥o? ? HES GGG ×= = 00 μμεε rr E ? 2 2 00 nEμε = 2 0 E c n μ ?;oSe~?? 1e~??￥??5μ 0 E  2 0 2 2 1 EE =  #  2 0 2 0 0 2 nEE c n SI ∝== μ  Yè | b 2 0 EI = ;oé￥S ? ,? ; Vn; ￡?; ONONON NN 1? ￡?; 1μ m--------------10μ m------------ NN 1? í￡? ?￡? ù￡ ? ,?; (UV) oé? ￥?s??o ?? b?.l $?1? b,?;  VUV ?? ?;o 1? ?;o μ/ ??é￥o?1? ?o?  1 bWò ?￥ ?? ^] ? q￥e~??b  2o?? ò? ??￥??? ? HWM? bW??B?×?￥??s?b ?@  ?1 p￥;o?? ? ? bW ^íKé￥? ?o b ??o ￥?? HW1  ??? ùé¤ H V| ?TíKéo ) ?b ??ˉ￥d? ?o? V[s31B" ? ?o￥?Fb ? ?;o? ^e~o  bWò?￥?? V[?]b 7 a?^ ;D ?=c ;￥o? ? 2? ?;o ￥ í ?  èHo? ^ O o ??¨ O Vr T í ?b ???  ?Hq￥? ?;o ?T àμ ê?? ' è?s ò?Z_? ^M]￥ Yè¨S Vr T í ?  L ^B? |? ￥ ü ? = í ?? ?;o Bs ￥?? ])(cos[)()](cos[)(),( tPPAPtPAtPU ω??ω ?=?= )(PA ??￥ bWs? )(P? êM￥ bWs?b (D HW tí1b 3? ?;o ?o ?s ? o ? bW? )(P? M]￥? ?F?￥ w ? ^;o￥?êM ? 'o ?o? ?b V? o ?￥?|;os ?b êMM]￥ bW?? ?@/ ?Z? M] H Y .)( ConstP =? zyx ezeyexzyxP GGG ++=),,(??  1 ü ?o o ? ^ ü ?b  a 1è ?  b)(PA )(P? 1°?US￥L?f ?' 00 )( ??? +++=+?= zkykxkrkP zyx G G 8 a?^ ;D ?=c ;￥o? ? è ? 0 ?? 1êM' H Y t=0 He?￥ êMb nk G K λ π2 = o O ·_o￥.lZ_  ?′1?o ? V U π2 é =￥oé ? "b o ?￥Hq1 )(P? =const.' .constrk =? G G 1Do O<°￥B"  ü ?# b o O￥Z_?V U 9 a?^ ;D ?=c ;￥o? ?  ?D?è¨Z_??V U O ￥Z_'¨ O DUSàW￥C?V Ub o O￥Z_ V[¨Z_???V U1 ),,( γβα  ?￥ ???sY ^ D XYZ à￥C?b5o O V[¨ O  TV U1 k G )coscos(cos zyx eeekk GGG G γβα ++= ;D?á ì8 ¨  ? ???￥??V UZ_' α π θ ?= 2 1  β π θ ?= 2 2  γ π θ ?= 2 3 b5 ),,( 321 θθθ ü ^ k D YOZaXOZ ? XOY ?? ü ?￥C?b G 5  ?o OV U TM1 )sinsin(sin 321 zyx eeekk GGG G θθθ ++=  bW? )￥êM1 ),,( zyxP 0321 )sinsinsin(),,( ?θθθ? +++= zyxkzyx b ??;D?￥? ¤ l àaa ^B? ü ? ?[Yè9 ^ù?o??B? ü ? ￥ êMb V[ | |? ü ?ê?US"? z=0) 5? ü ? ￥êMs?1 021 )sinsin()0,,( ?θθ? ++= yxkyx ?T ü ?o  +Z _.l o ?< °? Z àb t H Yà  B? z )o ?￥êM1 10 a?^ ;D ?=c ;￥o? ? 0 ),( ?ω? +?= tkzzt b/B H Y dttt +=′ 1 ?êM?M ?o ?￥ ê?1 5μ dzzz +=′ 00 )()( ?ω?ω ++?+=+? dttdzzktkz ' dtkdz ω= o ?.l￥ ?1 νλ λ π πνω ==== 2 2 v kdt dz ? ? 1 o ?. l￥ ? 'ê M.l ￥ ? ? 1 M ? b ?T o ?￥Vr T1 0 )( ?ω? +??= tkzz   M ? 1 νλ ω ?=?== kdt dz v _ -Z Z_.lb B  ü ?o[ θ? ? ? ü ? N H ?T | ?  ?1 XOZ ü ?5 ? o￥o O 1 )sincos( θθ zx eekk GG G += Q o￥o O1 )sincos( θθ yx eekk GG G +?=′ bêMsY1 )sincos()( θθ? zxkP +=  )sincos()( θθ? zxkP +?=′  2 o ?o o ? ^ o ?  a??  b bWê MraPA /)( = )(P? = 0 ?+kr o ? )(P? = 0 ?+kr =Const.' =r è ?}VB? o ?b??.lZ_ ?hb o ?1 o ?bV?÷?_?÷? b ?To÷1 O 000o -1 )(p? = 0 ?ω +? tkr  ?B o ?ELZ_μ 0 ?ω +? tkr = 0 )()( ?ω ++?+ drtdrrk  11 a?^ ;D ?=c ;￥o? ? o ?.l ?1 kdt dr ω ==v 1Ve??￥? ? o ?ob ?o ?Vr T1 0 )( ?ω? +??= tkrP o ?.l ?1 kdt dr ω ?=?=v 1_??. l￥ o ?o'_e?? ￥ o ?ob 12 a?^ ;D ?=c ;￥o? ?  00z 0 ?￥ o ?o xy0 ü ? ￥??1 ]cos[)0,,( 0 2 0 22 2 0 22 ?ω +?++ ++ = + tzyxk zyx A yxU  00-z 0 ?￥ o ?o xy0 ü ? ￥??g1 ]cos[)0,,( 0 2 0 22 2 0 22 ?ω +?++ ++ = ? tzyxk zyx A yxU _ 00z 0 ?? ￥ o ?o1 ]cos[)0,,( 0 2 0 22 2 0 22 * ?ω +?++? ++ =+ tzyxk zyx A yxU _ 00-z 0 ?? ￥ o ?o1 ]cos[)0,,( 0 2 0 22 2 0 22 * ?ω +?++? ++ =? tzyxk zyx A yxU 13 a?^ ;D ?=c ;￥o? ? 14 a?^ ;D ?=c ;￥o? ? ? ?T?;÷ x 0 y 0 z 0 5 ??? ￥ o ?osY1 ])()(cos[ )()( )0,,( 0 2 0 2 0 2 0 2 0 2 0 2 0 ?ω +?+?+? +?+? = ± tzyyxxk zyyxx A yxU ])()(cos[ )()( )0,,( 0 2 0 2 0 2 0 2 0 2 0 2 0 * ?ω +?+?+?? +?+? = ± tzyyxxk zyyxx A yxU ? o ?o  ?￥???êMoD???÷?￥  ? rμ1 7D??M?÷ ?￥Zêí1 ?[ o ?o￥Vr T?e?MD￥V?????i?B?b 4;o￥ˉ ?? í ? tiPitPi eePAePAtPU ω?ω? ??± == )(])([ )()(),( ~  |?· ? ? ?;o￥ ? q? ^M ?￥ V[ ?Vr T?b? ? ?s'D H Wí1?s 1 '1ˉ??b ˉ??c ???êM °¤V U ;o bW P? ￥?? ? aˉ??V U o bW￥s? f ?b ?[ O ^31¨?? í ?￥1Z ? V[¨ˉ??}Vb )( )()( ~ Pi ePAPU ? = ;o? P?￥ < )( ~ )( ~ )()( *2 PUPUPAPI ==  1μ1;o￥+?à Q  o ?ê MM?￥ bW??￥ w ?9?o? ?b o -; o??￥ ?B w ?b ?? ? ??M?￥ bW??￥ w ?b  ao ˉ??o1 a￥ob  o1 a￥o .lZ_?? ^M1 ó￥b ü ?o  bW ?B ?￥ ??1 )]sinsinsin(exp[)( ~ 321 θθθ zyxikPAU ++= 1  ),,( 321 θθθ Z_￥o]B?  ao V[V U1 )]}sin()sin()sin([exp{)( ~ 321 * θθθ ?+?+?= zyxikpAU  ???? ^  321 ,, θθθ ??? Z_￥ob ??? ??f ?￥+? aa 31? 8￥ f ?T ?b  ? 90; ü ?? 1 θ Z_.l￥ ü ?o  ˉ?? [￥o - V U1 )sinexp()0,,( ~ 1 θikxAyxU =  ao )]sin(exp[)0,,( ~ 1 * θ?= ikxAyxU 5 ^ 1 θ Z_ 15 a?^ ;D ?=c ;￥o? ? .lb  ? o ?o  ])()()(exp[ ~ 2 0 2 0 2 0 zzyyxxik r A U ?+?+?= 1 V ? ?￥o b  a o ),,( 000 zyx ])()()(exp[ ~ 2 0 2 0 2 0 * zzyyxxik r A U ?+?+??= 5 ^_ ?? ￥b),,( 000 zyx oL Do ?<°￥°LV Uo￥.lZ_b Do O￥Z_ ^M]￥b oLü ^+?;D?￥;Lb  ù?Hq aíàHq  D5 ü ?o￥Vr Tdèe? ? L=? ??￥aa ^ o ?ob B? ü ?   êMi?M] 7 OVr TM?ˉb aa31B?Hq/ | o ?oí ?1 ü ?o) ?b    à t??￥ o ?o t? 09:;US ü ?￥e?¤ l à yx ′′ Dt ü ? xyM ?ù¤ l à  ?B? 1  22 yx ′+′=ρ  22 ρ+= zr  16 a?^ ;D ?=c ;￥o? ? ?? () )]))( 2 1 (1(|/[|]1|/[|/)( 2 0 2 0 22 0 ????++=+=+= z zEzzEzEPA ρ ρρ  ?  5 V- {bμ 2 ρ 2 z 2 )/ zρ  ||/)( 0 zEPA = 2 ρ  1 í  àHq b 2 z êM ???++=+= ||2/|(|)( 222 zzkzkP ρρ?  ?μ 5μ '  5 V[- {bN H ?@ ù?Hq b λρ /|| 2 >>z λρ <<||/ 2 z πλρ =<< 2/||2/ 2 kzk ||2/ 2 zρ ¤ l à êM V? ü ?o) ?b ?? || z<λ  ?[?ù?Hq V¤ 'ù?HqA ?cí àHqb 22 |||||| zzzz =<<<λρ íàHq/à t??￥ o ?o V[e?1 ]) ||2 |(|exp[ || )0,,( ~ 0 22 0 ?i z yx zik z E yxU + ′+′ +=′′ b ù?Hq/à t??￥ o ?o V[e?1 ]||exp[)0,,( ~ 0 0 ?izik z E yxU +=′′  V[T1 ü ?o) ?b   à?t??￥ o ?o  17 a?^ ;D ?=c ;￥o? ? ??t?W  222 )()( zyyxxr +′?+′?=  ??Dt ü ???W  22222 0 zyxzr +′+′=+= ρ  ¤ l à??Dt?W  2222 2 00 zyxzr ++=+=′ ρ   2? 0￥  ? 22 0 yx +=ρ b t???? ?@íàHq Hμ ||2 || 22 0 z yx zr ′+′ +=  ||2 || 22 0 z yx zr + +=′  ||||2 ||||2||||2||2 || 22 0 22 0 2222 z yyxx z yx r z yyxx z yx r z yyxx z yx z yx zr ′+′ ? + += ′+′ ? ′+′ +′= ′+′ ? + + ′+′ +=  ¤ l à ￥ˉ?? )] || (exp[)] ||2 (exp[ )] || (exp[)] ||2 (exp[ || ),( ~ 22 0 0 22 0 0 z yyxx ik z yx rik z E z yyxx ik z yx rik z E yxU ′+′ ? ′+′ +′= ′+′ ? + +=′′  ù?Hq1 t? 'λρ /|| 2 0 >>z z x << λ 2 ? z y << λ 2 ?? 'λρ /|| 2 >>z z x << ′ λ 2 ? z y << ′ λ 2  ?T?? 1 ?@ù?Hq￥?μ 18 a?^ ;D ?=c ;￥o? ? )] || (exp[ || ),( ~ 0 0 z yyxx ikikr z E yxU ′+′ ?=′′  ? ?Tt? 2 ? @ù?Hq￥?μ )] || (exp[ || ),( ~ 0 0 z yyxx ikrik z E yxU ′+′ ?′=′′  ? ^ ü ?o￥? Tb o￥êM D;?  ü ?oêM1 00 )( ??? +++=+?= zkykxkrkP zyx G G 0 22 λ π λ π n k ==  0 λ 1? b?￥oé 1oé￥|  qb n [B?1 è nsnxkx 00 22 λ π λ π == nsnx = 1oé?o￥;?b VnêM?;? %?b ']B H Y bW?;?M]￥? êM9M]??9M]b ü ?o| a Z_?o ???? 3?Mb í?a i?￥e ?? V[V;?￥M?é? 3 db ? ü ?o bW ?￥;?μ π2j=? H ?? ^M]￥b üji?? ?T | s?B" ¨1oéoé? ?￥ ? 5ò? ?￥M?ê?  ü ?o￥?? ? ?M]b ?[ ? ?" 9F;?-?| ií Db V[|  ?? o =ò ?  ?  {μ o ?￥?s ?a| ? ìb]B? ü ?  üV?i?￥ ü ?;' ü?; ? ˉ|? e ?￥^ Z?? b ? ?Be ?S?￥i ??1c \ 9 'SFTOFMi? b ?c \9i?? ?¨??^by1? 'FSNBUe ? ü?;￥? ?i? ^^?b 19 a?^ ;D ?=c ;￥o? ?  ?êM￥? -Dìa  1?￥?? ^ ?e? 0. l ?￥b  ?e?￥??¨ )cos(),( 0 tAtOU ω? ?= 0 í ?7 1? 1 0?üt HW U'? vxvOPt // ==?  5 U H Y 1?￥??1 U?U H Y 0? ￥??'  )]/(cos[)(),(),( 0 vxtPAttOUtPU ??=??= ω?   ])/(cos[)( 0 xvtPA ωω? +?=   ])/2(cos[)( 0 xtPA λπω? +?=   kv === λπνλπνω /2/2/   )cos()( 0 tkxPA ω? ?+=   ])(cos[)( tPPA ω? ?=  λ π2 =k o ObZ _1;￥.lZ_ vk ==νλω b 20 a?^ ;D ?=c ;￥o? ? 0 )( ?? += kxP 1 1? ￥ êMb P ?￥êM 1 O ?ìa   ?Vr T?êMv￥1ìab'ˉ ?Vr Tˉ ??Vr T?êM ?′vV Uìab kx ?T?¨? ? )cos()(),( 0 ?ω += tOAtOU ? )cos()(),( 0 ?ω +?= kxtPAtPU ￥V r T5êM￥ ?′vV U? -b 21