NgenisaIsitholi sezithombe se-InGaAs
I-InGaAs ingenye yezinto ezifanelekile zokufeza impendulo ephezulu kanyei-photodetector yesivinini esikhuluOkokuqala, i-InGaAs iyinto ye-semiconductor ye-bandgap eqondile, futhi ububanzi bayo be-bandgap bungalawulwa yisilinganiso esiphakathi kwe-In ne-Ga, okuvumela ukutholakala kwezimpawu zokukhanya zama-wavelength ahlukene. Phakathi kwazo, i-In0.53Ga0.47As ifaniswe kahle ne-InP substrate lattice futhi ine-coefficient ephezulu kakhulu yokumuncwa kokukhanya ebhendini yokuxhumana ye-optical. Iyona esetshenziswa kakhulu ekulungiseleleniumshini wokuthola izithombefuthi inokusebenza okuhle kakhulu kokukhanya kwelanga kanye nokusebenza kokuphendula. Okwesibili, zombili izinto ze-InGaAs kanye ne-InP zinejubane eliphezulu lokukhukhuleka kwama-electron, kanye nejubane lazo lokukhukhuleka kwama-electron agcwele cishe liyi-1×107cm/s. Okwamanje, ngaphansi kwezinkambu ezithile zikagesi, izinto ze-InGaAs kanye ne-InP zibonisa imiphumela yokweqisa ijubane lama-electron, kanye nejubane lazo lokukhukhuleka lifinyelela ku-4×107cm/s kanye no-6×107cm/s ngokulandelana. Kusiza ekufinyeleleni i-bandwidth ephezulu yokuwela. Njengamanje, ama-photodetector e-InGaAs ayi-photodetector evame kakhulu yokuxhumana kwe-optical. Emakethe, indlela yokuhlanganisa izingozi ebusweni iyona evame kakhulu. Imikhiqizo yokuhlonza izingozi ebusweni ene-25 Gaud/s kanye ne-56 Gaud/s ingakhiqizwa kakade ngobuningi. Ama-detectors ebusweni amancane, angemuva, kanye ne-bandwidth ephezulu nawo athuthukiswe, ikakhulukazi izinhlelo zokusebenza ezifana nesivinini esiphezulu kanye nokugcwala okuphezulu. Kodwa-ke, ngenxa yokulinganiselwa kwezindlela zabo zokuxhumanisa, ama-surface incidence detectors kunzima ukuwahlanganisa namanye amadivayisi e-optoelectronic. Ngakho-ke, njengoba isidingo sokuhlanganiswa kwe-optoelectronic sikhula, ama-photodetector e-InGaAs ahlanganiswe yi-waveguide asebenza kahle kakhulu futhi afanele ukuhlanganiswa abe yinto ebalulekile ocwaningweni. Phakathi kwawo, amamojula e-InGaAs photodetector e-70GHz kanye ne-110GHz cishe wonke asebenzisa izakhiwo zokuxhumanisa ze-waveguide. Ngokusho komehluko wezinto ezingaphansi komhlaba, ama-photodetector e-InGaAs ahlanganiswe yi-waveguide angahlukaniswa kakhulu ngezinhlobo ezimbili: ezisekelwe ku-INP kanye nezisekelwe ku-Si. I-epitaxial yezinto eziku-InP substrates inekhwalithi ephezulu futhi ifaneleka kakhulu ekwakhiweni kwamadivayisi asebenza kahle kakhulu. Kodwa-ke, ezintweni zeqembu le-III-V ezikhuliswe noma eziboshiwe ku-Si substrates, ngenxa yokungafani okuhlukahlukene phakathi kwezinto ze-InGaAs kanye ne-Si substrates, ikhwalithi yezinto noma isikhombimsebenzisi iphansi kakhulu, futhi kusenendawo enkulu yokuthuthukisa ukusebenza kwamadivayisi.
Ukuzinza kwe-photodetector ezindaweni ezahlukene zokusetshenziswa, ikakhulukazi ngaphansi kwezimo ezimbi kakhulu, nakho kungenye yezinto ezibalulekile ekusetshenzisweni okusebenzayo. Eminyakeni yamuva nje, izinhlobo ezintsha ze-detector ezifana ne-perovskite, izinto eziphilayo kanye nezinto ezinezinhlangothi ezimbili, ezidonsele ukunaka okukhulu, zisabhekene nezinselele eziningi maqondana nokuzinza kwesikhathi eside ngenxa yokuthi izinto ngokwazo zithinteka kalula yizici zemvelo. Okwamanje, inqubo yokuhlanganisa izinto ezintsha ayikavuthwa, futhi kusadingeka ukuhlolwa okwengeziwe ukuze kukhiqizwe kahle kakhulu futhi kusebenze kahle.
Nakuba ukwethulwa kwama-inductor kungakhulisa ngempumelelo i-bandwidth yamadivayisi njengamanje, akuthandwa ezinhlelweni zokuxhumana ze-digital optical. Ngakho-ke, indlela yokugwema imiphumela emibi yokunciphisa kakhulu amapharamitha e-RC e-parasitic yedivayisi ingenye yezinkomba zocwaningo ze-photodetector yesivinini esikhulu. Okwesibili, njengoba i-bandwidth yama-photodetector ahlanganiswe ne-waveguide iqhubeka nokukhula, umkhawulo phakathi kwe-bandwidth kanye nokusabela uqala ukuvela futhi. Nakuba kubikwe ama-photodetector e-Ge/Si kanye ne-InGaAs photodetector ene-bandwidth ye-3dB edlula i-200GHz, ukusabela kwawo akwanelisi. Indlela yokwandisa i-bandwidth ngenkathi ugcina ukuphendula okuhle kuyisihloko esibalulekile socwaningo, esingadinga ukwethulwa kwezinto ezintsha ezihambisana nenqubo (ukuhamba okuphezulu kanye ne-high absorption coefficient) noma izakhiwo ezintsha zedivayisi yesivinini esikhulu ukuze zixazululwe. Ngaphezu kwalokho, njengoba i-bandwidth yedivayisi ikhula, izimo zokusetshenziswa kwama-detector kuzixhumanisi ze-microwave photonic zizokhula kancane kancane. Ngokungafani nokwenzeka kwamandla amancane okukhanya kanye nokutholwa kokuzwela okuphezulu ekuxhumaneni kwe-optical, lesi simo, ngokusekelwe ku-bandwidth ephezulu, sinesidingo samandla aphezulu sokugcwala kwamandla aphezulu. Kodwa-ke, amadivayisi ane-bandwidth ephezulu avame ukusebenzisa izakhiwo ezincane, ngakho-ke akulula ukwakha ama-photodetector anamandla aphezulu futhi agcwele, futhi kungadingeka ezinye izinto ezintsha ekukhishweni nasekushabalaleni kokushisa kwamadivayisi. Okokugcina, ukunciphisa ugesi omnyama wama-detector asheshayo kuseyinkinga okudingeka ixazululwe ama-photodetector ane-lattice mismatch. Ugesi omnyama uhlobene kakhulu nekhwalithi yekristalu kanye nesimo sobuso bezinto. Ngakho-ke, izinqubo ezibalulekile ezifana ne-heteroepitaxy esezingeni eliphezulu noma ukubopha ngaphansi kwezinhlelo ze-lattice mismatch zidinga ucwaningo olwengeziwe kanye nokutshalwa kwezimali.
Isikhathi sokuthunyelwe: Agasti-20-2025