Trng HKH T NhinKhoa Vt LGVHD: T.S L V TUN HNGHV : L NGUYN BO THCc loi mng quang hc

LCH S MNG QUANGGNG VENETIANFRAUNHOFERA.FRESNEL

Nm 1899: L thuyt Fabry-Perot ra i . L thuyt c bn ny miu t s nhiu ca tng sng cc b phn x t hai b mt quang hc song song, cc lp vt liu in mi khc nhau c lng ng trn mt chui xc nh trn b mt ca thnh phn quang hc. t nht hai lp vt liu vi chit sut khc nhau phi c chn la iu chnh hm truyn ph ca lp sp xp theo qui trnh xc nh

Hiu quang l: phn x :

dy D ca lp (tnh theo QWOT)

Vi mt lp n dy 1 QWOTVi mt lp n dy 2 QWOTQWOT: quarter wave optical thickness

Ma trn hnh thc (matrix formalism)Cc yu t ca ma trn n lp Mi c th thu c t cc iu kin bin trong cu trc lp lin quan n cng in trng (Ei-1) v t trng (Hi-1) mt trc v cc gi tr cng trng (Ei v Hi) ng sau ca lp:

MNG QUANG HCMng quang hc gm mt hay nhiu lp vt liu mng ph trn mt thit b quang hc nh thu knh hay gng, nhng thit b cho php bin i ng i ca nh sng phn x hay truyn qua. Cc loi mng quang hc chnh: Mng chng phn x Mng phn x cao Mng dn in truyn qua Mng lc nh sng

MNG PHN X CAO

Mng phn x cao (HR) l mt mng hay h thng mng ph trn mt b mt lm tng s phn x ton b ca b mt .Mng phn xMng kim loi:Mng in mi

Mng kim loiMng kim loi c s dng ch yu hng nh sng trong mt h quang hc, v c s dng trong hu ht cc h thng quang hin nay, v l thit b lm bin i tnh phn x kinh t nht. Mng kim loi c th c dng trong mt di sng rng, nhng c xu hng d v v kh lm sch.Cc kim loi c s dng ph bin nht cho cc b mt phn x cao l Nhm (Al), Vng (Au), Bc (Ag).

HR

MNG IN MI Mng in mi bao gm cc lp mng lm bng vt liu in mi c tnh truyn qua, c ph trn mt b mt. Chc nng ca chng l tng cng tnh phn x ca b mt bng cch li dng s giao thoa ca tia phn x t nhiu b mt quang hc.Cc vt liu thng s dng l: SiO2, TiO2, Al2O3 and Ta2O5, v hp cht ca Flour nh MgF2, LaF3 and AlF3

MNG IN MI Thit k phn x cao da trn cc lp chit sut cao v thp xen k nhau, nH v nL , do mt vng dng (hay khu vc phn x cao) c to ra xung quanh bc sng mu . Kiu thit k dng c bn nh sau: Mi trng / (HL)m H/ vi: m l s cp a lp

Thit b phn x cao c vng dng iu ha v tr th nht v cc vng dng iu ha cc bc sng ngn hn. gia vng dng iu ha l mt khu vc c bit nh vng xuyn qua ni m nh sng truyn qua v khng phn x li. i vi thit k c bn ny khng c vng dng th hai hay th t.

Cng thc tnh phn x:Cng thc tnh s cp lp:

ng dngMy photocopyn xeKnh vin vngKnh trt tuytH thng lasera CD

MNG CHNG PHN X (AR)Mng chng phn x c dng lm gim s phn x trn b mt. Gi s c th iu khin chnh xc dy lp ph l 1 QWOT). phn x l nh nht khi:

vi n1: chit sut ca lp mng, n0 v nS l chit sut ca hai mi trng

So snh s truyn nh sng trn b mt c ph lp chng phn x v khng ph.Ph lp chng phn xKhng ph lp chng phn x

Tin ch: gi thnh thp, tnh lp li cao, d thc hin.Hn ch: vng hot ng hp, kh tm thy vt liu chit sut thp bn.Vt liu mng l cc cht in mi chit sut thp : MgF2, Na3AlF6, CaF2, LiF2

Mng AR mt lp:

Tin ch: c nhiu s la chn vt liu hn, tinh vi hn, d sn xutHn ch: vng hot ng hp.MNG AR 2 LP (MNG V)

Mt trong nhng thit k ba lp thng dng v n gin l QHQ hay Quarter Half-Quarter.Mu QHQ nh sau: Thy tinh / M 2H LM = 1 QWOT ca vt liu chit sut trung bnh (vd:Al2O3)2H= 2 QWOT hay HWOT ca mt vt liu chit sut cao (vd: ZrO2)L=1 QWOT ca mt vt liu chit sut thp (vd: MgF2 hay SiO2), hnh thc ca mt QHQ M=Al2O3, H=ZrO2:MNG AR 3 LP

ng dng Thu knh trong my nh, knh hin vi, knh vin vng, ng nhmKnh eo mtng hThit b in t (in thoi, PVD)

Mng dn truyn qua (Transparent conductive coating TC)Mng dn truyn qua c s dng trong cc ng dng m iu quan trng l vic mng dn in hoc lm tan i cc in tch tch t. C hai loi chnh: Mng ITO Mng TCO

Mng ITO ( Indium Tin Oxide )- Mng c truyn qua cao ( 80% - 90% ). Phn x mnh i vi nh sng hng ngoi ( ng dng ph ln b mt knh, cho php nh sng truyn qua nhng gi li nhit bn trong hay bn ngoi ty mc ch s dng ). dn in tt. ng dng rng ri trong trong lnh vc quang in t : LCD, pin mt tri, diod pht quang,

Mng ITO ( Indium Tin Oxide ) Tnh cht quang ca mng ITO to bng pp phn x truyn ph thuc vo cu trc cng nh hnh thi b mt mng ( truyn qua gim khi dy mng tng )

Mng lc (FILTER)u im :- Tnh cht lc tt hn, thit b quang ph lp lc giao thoa t mt mt nhit hn cc mng lc thng thngNhc im : Gi thnh caoL loi mng c s dng lc v cho nhng nh sng nht nh i qua.Filter

Ti liu tham khoF.Trager (Editor),Handbook of Laser and Optics,,Springer,USA,2007.Optical thin film application, Opto-Precision Application Note A003, 2003Cc website: http://en.wikipedia.org/wiki/Optical_coating#column-one#column-one http://hyperphysics.phy-astr.gsu.edu/HBASE/phyopt/antiref.html http://www.rp-photonics.com/dielectric_coatings.htm http://www.kruschwitz.com/HR's.htm http://www.opcolab.com/page130.html

Chng ti dch c mt s chng ca mt s kha hc thuc chng trnh hc liu m ca hai trng i hc ni ting th gii MIT v Yale.Chi tit xin xem ti:http://mientayvn.com/OCW/MIT/Vat_li.htmlhttp://mientayvn.com/OCW/YALE/Ki_thuat_y_sinh.html