Umklamo weisithombeisifunda esihlanganisiwe
Amasekhethi ahlanganisiwe e-Photonic(PIC) kuvame ukuklanywa ngosizo lwemibhalo yezibalo ngenxa yokubaluleka kobude bendlela kuma-interferometer noma ezinye izinhlelo zokusebenza ezizwelayo kubude bendlela.I-PICikhiqizwa ngokupapasha izendlalelo eziningi (imvamisa ezi-10 kuye kwezingu-30) ku-wafer, ezakhiwe ngamajamo amaningi angama-polygonal, avame ukumelelwa ngefomethi ye-GDSII. Ngaphambi kokuthumela ifayela kumkhiqizi we-photomask, kufiseleka kakhulu ukwazi ukulingisa i-PIC ukuze uqinisekise ukulunga komklamo. Ukulingisa kuhlukaniswe ngamaleveli amaningi: izinga eliphansi kunawo wonke ukulingisa kwe-electromagnetic (EM) enezinhlangothi ezintathu, lapho ukulingisa kwenziwa kuleveli ye-sub-wavelength, nakuba ukusebenzisana phakathi kwama-athomu kundaba kuphathwa esikalini esikhulu. Izindlela ezijwayelekile zifaka phakathi isizinda sesikhathi esinezinhlangothi ezintathu esinqunyiwe (3D FDTD) kanye nokunwetshwa kwe-eigenmode (EME). Lezi zindlela zinembile kakhulu, kodwa azisebenzi kuso sonke isikhathi sokulingisa se-PIC. Ileveli elandelayo ingu-2.5-dimensional EM simulation, efana ne-finite-difference beam propagation (FD-BPM). Lezi zindlela zishesha kakhulu, kodwa zidela ukunemba okuthile futhi zingaphatha kuphela ukusakazwa kwe-paraxial futhi azikwazi ukusetshenziselwa ukulingisa ama-resonators, isibonelo. Ileveli elandelayo ukulingisa kwe-2D EM, okufana ne-2D FDTD ne-2D BPM. Lezi nazo ziyashesha, kodwa zinokusebenza okulinganiselwe, njengokuthi azikwazi ukulingisa ama-rotator e-polarization. Elinye ileveli ukulingisa kanye/noma ukusakazeka kwe-matrix. Ingxenye ngayinye enkulu yehliswa ibe ingxenye enokufakwayo nokuphumayo, futhi i-waveguide exhunyiwe yehliselwa ekushintsheni kwesigaba kanye nesici sokunciphisa. Lezi zifaniso zishesha kakhulu. Isignali yokuphumayo itholakala ngokuphindaphinda i-matrix yokudlulisela ngesignali yokufaka. I-matrix ehlakazekayo (izakhi zayo ezibizwa ngokuthi amapharamitha angu-S) iphindaphinda amasignali okokufaka nokukhiphayo ohlangothini olulodwa ukuze kutholwe amasignali okokufaka nokukhiphayo ngakolunye uhlangothi lwengxenye. Ngokuyisisekelo, i-matrix ehlakazayo iqukethe ukubonakaliswa ngaphakathi kwe-elementi. I-matrix ehlakazayo ivamise ukuba nkulu ngokuphindwe kabili kune-matrix yokudlulisela kuhlangothi ngalunye. Kafushane, kusukela ku-3D EM kuya ekulingiseni kwe-matrix yokudlulisa/yokusabalalisa, ungqimba ngalunye lokulingisa luveza ukuhwebelana phakathi kwesivinini nokunemba, futhi abaklami bakhetha izinga elilungile lokulingisa ngezidingo zabo ezithile ukuze bathuthukise inqubo yokuqinisekisa idizayini.
Kodwa-ke, ukuthembela ekulingiseni kazibuthe kagesi kwezinto ezithile nokusebenzisa i-matrix yokuhlakaza/ukudlulisela ukulingisa yonke i-PIC akuqinisekisi idizayini elungile ngokuphelele phambi kwepuleti eligelezayo. Isibonelo, ubude bendlela obungabalwanga kahle, amagagasi emodi eningi ahlulekayo ukucindezela ngempumelelo amamodi e-oda eliphezulu, noma amagagasi amabili asondelene kakhulu aholela ezinkingeni zokuhlanganisa ezingalindelekile angase angabonakali ngesikhathi sokulingisa. Ngakho-ke, nakuba amathuluzi okulingisa athuthukile ehlinzeka ngamakhono anamandla okuqinisekisa ukuklama, kusadinga izinga eliphezulu lokuqapha nokuhlolwa ngokucophelela komklami, kuhlanganiswe nolwazi olungokoqobo nolwazi lobuchwepheshe, ukuze kuqinisekiswe ukunemba nokuthembeka komklamo futhi kuncishiswe ubungozi bomklamo. ishidi lokugeleza.
Indlela ebizwa ngokuthi i-Sparse FDTD ivumela ukulingisa kwe-3D ne-2D FDTD ukuthi kwenziwe ngokuqondile kumklamo ophelele we-PIC ukuze kuqinisekiswe umklamo. Nakuba kunzima kunoma yiliphi ithuluzi lokulingisa uzibuthe kagesi ukulingisa isikali esikhulu kakhulu se-PIC, i-FDTD ethe xaxa iyakwazi ukulingisa indawo yendawo enkulu kakhulu. Ku-3D FDTD yendabuko, ukulingisa kuqala ngokuqalisa izingxenye eziyisithupha zenkambu kazibuthe kagesi ngaphakathi kwevolumu ethile ebaliwe. Njengoba isikhathi siqhubeka, ingxenye entsha yensimu kuvolumu ibalwa, njalonjalo. Isinyathelo ngasinye sidinga ukubala okuningi, ngakho sithatha isikhathi eside. Nge-3D FDTD embalwa, esikhundleni sokubala esinyathelweni ngasinye endaweni ngayinye yevolumu, uhlu lwezingxenye zenkambu luyagcinwa olungaqondana ngokombono nevolumu enkulu ngokungafanele futhi lubalwe kuphela lezo zingxenye. Esinyathelweni ngasinye sesikhathi, amaphuzu ancikene nezingxenye zenkambu ayengezwa, kuyilapho izingxenye zenkambu ezingaphansi komkhawulo wamandla othile ziyehliswa. Kwezinye izakhiwo, lokhu kubala kungaba ama-oda amaningana obukhulu ngokushesha kune-3D FDTD evamile. Nokho, i-FDTDS encane ayenzi kahle uma isebenza nezakhiwo ezihlakazekayo ngenxa yokuthi le nkundla yesikhathi isakazeka kakhulu, okuholela ezinhlwini ezinde kakhulu futhi okunzima ukuzilawula. Umfanekiso 1 ubonisa isibonelo sesithombe-skrini sokulingiswa kwe-3D FDTD esifana ne-polarization beam splitter (PBS).
Umfanekiso 1: Imiphumela yokulingisa evela ku-3D sparse FDTD. (A) ukubuka okuphezulu kwesakhiwo esilingiswayo, okuyi-coupler eqondisayo. (B) Ibonisa isithombe-skrini sokulingiswa kusetshenziswa i-quasi-TE excitation. Imidwebo emibili engenhla ibonisa ukubuka okuphezulu kwezimpawu ze-quasi-TE kanye ne-quasi-TM, futhi imidwebo emibili engezansi ibonisa ukubuka okuhambisanayo kwesigaba esiphambene. (C) Ibonisa isithombe-skrini sokulingiswa kusetshenziswa i-quasi-TM excitation.
Isikhathi sokuthumela: Jul-23-2024