InGaAs yog ib qho ntawm cov ntaub ntawv zoo tshaj plaws rau kev ua tiav cov lus teb siab thiabhigh-ceev photodetector. Ua ntej, InGaAs yog cov khoom siv ncaj qha bandgap semiconductor, thiab nws qhov dav bandgap tuaj yeem tswj hwm los ntawm qhov sib piv ntawm In thiab Ga, ua kom pom cov teeb liab kho qhov muag ntawm qhov sib txawv wavelengths. Ntawm lawv, In0.53Ga0.47As zoo sib xws nrog InP substrate lattice thiab muaj lub teeb pom kev zoo heev hauv kev sib txuas lus optical band. Nws yog feem ntau dav siv nyob rau hauv kev npaj ntawmphotodetectorthiab tseem muaj qhov zoo tshaj plaws tsaus nti tam sim no thiab lub luag haujlwm ua haujlwm. Qhov thib ob, ob qho tib si InGaAs thiab InP cov ntaub ntawv muaj cov hluav taws xob nrawm nrawm, nrog rau lawv cov hluav taws xob saturated drift velocities ob qho tib si kwv yees li 1 × 107cm / s. Lub caij no, nyob rau hauv cov chaw hluav taws xob tshwj xeeb, InGaAs thiab InP cov ntaub ntawv nthuav tawm cov teeb meem hluav taws xob tshaj tawm, nrog rau lawv cov kev tshaj tawm dhau mus txog 4 × 107cm / s thiab 6 × 107cm / s feem. Nws yog qhov tsim nyog rau kev ua tiav kev hla ntau dua bandwidth. Tam sim no, InGaAs photodetectors yog qhov tseem ceeb tshaj plaws photodetector rau kev sib txuas lus kho qhov muag. Hauv kev ua lag luam, txoj kev sib txuas ntawm qhov chaw sib txuas yog qhov feem ntau. Surface-incident detector khoom nrog 25 Gaud / s thiab 56 Gaud / s tuaj yeem tsim khoom loj. Qhov me me, qhov xwm txheej rov qab, thiab cov khoom siv hluav taws xob siab-bandwidth deg-cim detectors kuj tau tsim, feem ntau yog siv rau cov kev siv xws li kev kub ceev thiab kev ua haujlwm siab. Txawm li cas los xij, vim muaj kev txwv ntawm lawv txoj kev sib txuas, qhov teeb meem ntawm qhov chaw ntes tau nyuaj rau kev koom ua ke nrog lwm cov khoom siv optoelectronic. Yog li ntawd, nrog rau qhov kev thov ntau ntxiv rau kev sib koom ua ke optoelectronic, waveguide txuas nrog InGaAs photodetectors nrog kev ua tau zoo thiab tsim nyog rau kev sib koom ua ke tau maj mam dhau los ua qhov tseem ceeb ntawm kev tshawb fawb. Ntawm lawv, kev lag luam InGaAs photodetector modules ntawm 70GHz thiab 110GHz yuav luag txhua tus txais yuav waveguide coupling qauv. Raws li qhov sib txawv ntawm cov ntaub ntawv substrate, waveguide txuas nrog InGaAs photodetectors tuaj yeem raug faib ua ob hom: INP-based thiab Si-based. Cov khoom siv epitaxial ntawm InP substrates muaj qhov zoo thiab tsim nyog rau kev tsim cov khoom siv ua haujlwm siab. Txawm li cas los xij, rau pawg III-V cov ntaub ntawv loj hlob lossis sib koom ua ke ntawm Si substrates, vim muaj ntau yam tsis sib xws ntawm InGaAs cov ntaub ntawv thiab Si substrates, cov khoom siv lossis cov khoom siv sib cuam tshuam yog qhov tsis zoo, thiab tseem muaj ntau chav rau kev txhim kho kev ua haujlwm ntawm cov khoom siv.
Kev ruaj ntseg ntawm photodetector nyob rau hauv ntau yam kev thov ib puag ncig, tshwj xeeb tshaj yog nyob rau hauv huab cua txias, kuj yog ib qho tseem ceeb ntawm cov kev siv tswv yim. Nyob rau hauv xyoo tas los no, hom tshiab detectors xws li perovskite, organic thiab ob-dimensional cov ntaub ntawv, uas tau attracted ntau xim, tseem ntsib ntau cov kev cov nyom nyob rau hauv lub sij hawm ntev stability vim hais tias cov ntaub ntawv lawv tus kheej yog yooj yim cuam tshuam los ntawm ib puag ncig yam. Lub caij no, cov txheej txheem kev koom ua ke ntawm cov ntaub ntawv tshiab tseem tsis paub tab, thiab kev tshawb nrhiav ntxiv tseem xav tau rau kev tsim khoom loj thiab kev ua tau zoo sib xws.
Txawm hais tias qhov kev taw qhia ntawm cov inductors tuaj yeem ua kom cov bandwidth ntawm cov khoom siv tam sim no, nws tsis nrov hauv cov kev sib txuas lus digital. Yog li ntawd, yuav ua li cas kom tsis txhob muaj kev cuam tshuam tsis zoo kom txo qis cov kab mob RC tsis zoo ntawm cov cuab yeej yog ib qho kev tshawb fawb qhia ntawm high-speed photodetector. Qhov thib ob, raws li qhov bandwidth ntawm waveguide txuas nrog photodetectors nce zuj zus, qhov txwv ntawm bandwidth thiab lub luag haujlwm pib rov tshwm sim dua. Txawm hais tias Ge/Si photodetectors thiab InGaAs photodetector nrog 3dB bandwidth tshaj 200GHz tau tshaj tawm, lawv lub luag haujlwm tsis txaus siab. Yuav ua li cas nce bandwidth thaum tuav lub luag haujlwm zoo yog lub ntsiab lus tseem ceeb ntawm kev tshawb fawb, uas yuav xav tau kev qhia txog cov txheej txheem tshiab-tshaj tawm cov ntaub ntawv (siab txav thiab siab nqus coefficient) los yog cov cuab yeej siv high-speed tshiab los daws. Tsis tas li ntawd, raws li cov cuab yeej bandwidth nce, daim ntawv thov scenarios ntawm detectors hauv microwave photonic txuas yuav maj mam nce. Tsis zoo li qhov teeb meem me me ntawm lub hwj chim kho qhov muag thiab kev tshawb pom siab hauv kev sib txuas lus kho qhov muag, qhov xwm txheej no, ntawm lub hauv paus ntawm kev siv bandwidth siab, muaj lub zog saturation siab xav tau rau qhov xwm txheej siab. Txawm li cas los xij, cov khoom siv high-bandwidth feem ntau yog siv cov qauv me me, yog li nws tsis yooj yim rau fabricate high-speed thiab high-saturation-power photodetectors, thiab cov kev hloov tshiab ntxiv yuav xav tau nyob rau hauv cov cab kuj extraction thiab kub dissipation ntawm cov cuab yeej. Thaum kawg, txo qhov tsaus ntuj tam sim no ntawm cov ntsuas kub ceev tseem yog ib qho teeb meem uas photodetectors nrog lattice mismatch yuav tsum tau daws. Tsaus tam sim no feem ntau cuam tshuam nrog cov khoom siv lead ua zoo thiab lub xeev ntawm cov khoom. Yog li ntawd, cov txheej txheem tseem ceeb xws li kev ua haujlwm zoo heteroepitaxy lossis kev sib koom ua ke hauv cov kab lattice mismatch yuav tsum muaj kev tshawb fawb ntxiv thiab kev nqis peev.
Post lub sij hawm: Aug-20-2025