YazisaIsixhobo sokubona iifoto se-InGaAs
I-InGaAs yenye yezona zinto zifanelekileyo zokufikelela kwimpendulo ephezulu kunyeisixhobo sokubona iifoto esikhawulezayoOkokuqala, i-InGaAs yinto ye-bandgap semiconductor ethe ngqo, kwaye ububanzi bayo be-bandgap bunokulawulwa ngumlinganiselo ophakathi kwe-In kunye ne-Ga, okuvumela ukubonwa kwemiqondiso ye-optical yee-wavelengths ezahlukeneyo. Phakathi kwazo, i-In0.53Ga0.47As ihambelana ngokugqibeleleyo ne-InP substrate lattice kwaye ine-coefficient ephezulu kakhulu yokufunxa ukukhanya kwi-optical communication band. Yeyona isetyenziswa kakhulu ekulungiseleleniisixhobo sokubona iifotokwaye ikwanayo nokusebenza okugqwesileyo kombane omnyama kunye nokuphendula. Okwesibini, zombini izinto ze-InGaAs kunye ne-InP zinesantya esiphezulu sokuhamba kwee-electron, kunye nesantya sazo sokuhamba kwee-electron ezigcweleyo zombini zimalunga ne-1×107cm/s. Okwangoku, phantsi kwamacandelo athile ombane, izinto ze-InGaAs kunye ne-InP zibonisa iziphumo zokudlula kwesantya see-electron, kunye nesantya sazo sokuhamba sifikelela kwi-4×107cm/s kunye ne-6×107cm/s ngokulandelelana. Inceda ekufezekiseni i-bandwidth ephezulu yokuwela. Okwangoku, ii-photodetectors ze-InGaAs zezona zi-photodetector ziphambili zonxibelelwano lwe-optical. Kwimarike, indlela yokudibanisa i-surface-incident coupling yeyona ixhaphakileyo. Iimveliso ze-surface-incident detector ezine-25 Gaud/s kunye ne-56 Gaud/s sele zenziwe ngobuninzi. Ii-surface-incident detectors ezincinci, ezingasemva, kunye ne-high-bandwidth detectors nazo ziye zaphuhliswa, ikakhulu kwizicelo ezifana nesantya esiphezulu kunye nokugcwala okuphezulu. Nangona kunjalo, ngenxa yemida yeendlela zabo zokudibanisa, izixhobo zokubona iziganeko ezingaphaya komhlaba kunzima ukuzidibanisa nezinye izixhobo ze-optoelectronic. Ke ngoko, ngenxa yokwanda kwemfuno yokudibanisa i-optoelectronic, ii-photodetectors ze-InGaAs ezidityaniswe ne-waveguide ezinentsebenzo egqwesileyo kwaye ezifanelekileyo ukuhlanganiswa ziye zaba yindawo ephambili yophando. Phakathi kwazo, iimodyuli ze-photodetector ze-InGaAs zorhwebo ze-70GHz kunye ne-110GHz phantse zonke zisebenzisa izakhiwo zokudibanisa i-waveguide. Ngokweyantlukwano kwizixhobo ze-substrate, ii-photodetectors ze-InGaAs ezidityaniswe ne-waveguide zinokuhlulwahlulwa zibe ziintlobo ezimbini: ezisekwe kwi-INP kunye nezisekwe kwi-Si. Izinto ze-epitaxial kwi-substrates ze-InP zinomgangatho ophezulu kwaye zifanelekile ngakumbi ekwenziweni kwezixhobo ezisebenza kakhulu. Nangona kunjalo, kwizixhobo zeqela le-III-V ezikhuliswe okanye ezibotshelelwe kwi-substrates ze-Si, ngenxa yokungafani okuhlukeneyo phakathi kwezinto ze-InGaAs kunye ne-substrates ze-Si, umgangatho wezinto okanye ujongano uphantsi kakhulu, kwaye kusekho indawo enkulu yokuphucula ukusebenza kwezixhobo.
Uzinzo lwe-photodetector kwiindawo ezahlukeneyo zokusetyenziswa, ingakumbi phantsi kweemeko ezinzima kakhulu, lukwayenye yezinto ezibalulekileyo kwizicelo ezisebenzayo. Kwiminyaka yakutshanje, iintlobo ezintsha ze-detector ezifana ne-perovskite, izinto eziphilayo kunye nezinto ezinemilinganiselo emibini, eziye zatsala ingqalelo enkulu, zisajongene nemingeni emininzi ngokubhekiselele kuzinzo lwexesha elide ngenxa yokuba izinto ngokwazo zichaphazeleka lula ziimeko zokusingqongileyo. Okwangoku, inkqubo yokudibanisa izinto ezintsha ayikavuthwa, kwaye uphando olongezelelweyo lusafuneka ukuze kuvele imveliso enkulu kunye nokusebenza okuzinzileyo.
Nangona ukungeniswa kwee-inductors kunokunyusa ngempumelelo ububanzi be-bandwidth yezixhobo okwangoku, akuthandwa kwiinkqubo zonxibelelwano lwe-digital optical. Ke ngoko, indlela yokuphepha iimpembelelo ezimbi zokunciphisa ngakumbi iiparameter ze-RC ze-parasitic zesixhobo yenye yeendlela zophando ze-photodetector yesantya esiphezulu. Okwesibini, njengoko ububanzi be-bandwidth yee-photodetectors ezidityanisiweyo ze-waveguide buqhubeka busanda, umqobo phakathi kwe-bandwidth kunye nokuphendula uqala ukuvela kwakhona. Nangona ii-photodetectors ze-Ge/Si kunye ne-InGaAs photodetector ene-bandwidth ye-3dB edlula i-200GHz ziye zaxelwa, uxanduva lwazo alwanelisi. Indlela yokunyusa ububanzi be-bandwidth ngelixa ugcina uxanduva oluhle sisihloko sophando esibalulekileyo, esinokufuna ukwaziswa kwezixhobo ezintsha ezihambelana nenkqubo (ukuhamba okuphezulu kunye ne-high absorption coefficient) okanye izakhiwo ezintsha zesixhobo esinesantya esiphezulu ukuze zisombululwe. Ukongeza, njengoko ububanzi be-bandwidth yesixhobo bukhula, iimeko zokusetyenziswa kwee-detectors kwi-microwave photonic links ziya kwanda kancinci kancinci. Ngokungafaniyo nokwenzeka kwamandla amancinci okukhanya kunye nokufunyanwa kobuntununtunu obuphezulu kunxibelelwano lwe-optical, le meko, ngokusekelwe kwi-bandwidth ephezulu, inemfuno ephezulu yamandla okugcwala kwamandla aphezulu. Nangona kunjalo, izixhobo ze-bandwidth ephezulu zihlala zisebenzisa izakhiwo ezincinci, ngoko ke akulula ukwenza ii-photodetectors ezinamandla aphezulu kunye nokugcwala okuphezulu, kwaye ezinye izinto ezintsha zinokufuneka ekukhupheni nasekuchitheni ubushushu bezixhobo. Okokugqibela, ukunciphisa umnyama wamandla okufumana ii-high-speed detectors kuseyingxaki ekufuneka isonjululwe zii-photodetectors ezine-lattice mismatch. Umnyama wamandla unxulumene kakhulu nomgangatho wekristale kunye nemeko yomphezulu wezinto. Ke ngoko, iinkqubo eziphambili ezifana ne-heteroepitaxy yomgangatho ophezulu okanye ukubophelela phantsi kweenkqubo ze-lattice mismatch zifuna uphando oluthe kratya kunye notyalo-mali.
Ixesha leposi: Agasti-20-2025