Cov thev naus laus zis tshiab ntawm cov duab silicon nyias

Cov thev naus laus zis tshiab ntawmlub tshuab ntsuas duab silicon nyias
Cov qauv ntes photon siv los txhim kho kev nqus lub teeb hauv cov ntaub nyias nyiascov duab silicon
Cov tshuab photonic tau txais kev rub sai hauv ntau daim ntawv thov tshiab, suav nrog kev sib txuas lus optical, liDAR sensing, thiab kev kho mob duab. Txawm li cas los xij, kev siv photonics dav dav hauv kev daws teeb meem engineering yav tom ntej nyob ntawm tus nqi ntawm kev tsim khoom.photodetectors, uas nyob rau hauv lem feem ntau nyob ntawm hom semiconductor siv rau lub hom phiaj ntawd.
Ib txwm muaj, silicon (Si) yog lub semiconductor uas muaj ntau tshaj plaws hauv kev lag luam hluav taws xob, ntau heev uas feem ntau cov lag luam tau loj hlob nyob ib puag ncig cov khoom siv no. Hmoov tsis zoo, Si muaj qhov coefficient absorption lub teeb tsis muaj zog hauv qhov ze infrared (NIR) spectrum piv rau lwm cov semiconductors xws li gallium arsenide (GaAs). Vim li no, GaAs thiab cov alloys cuam tshuam tau vam meej hauv kev siv photonic tab sis tsis sib xws nrog cov txheej txheem complementary metal-oxide semiconductor (CMOS) ib txwm siv hauv kev tsim khoom ntawm feem ntau cov khoom siv hluav taws xob. Qhov no ua rau lawv cov nqi tsim khoom nce siab.
Cov kws tshawb fawb tau tsim ib txoj hauv kev los txhim kho qhov ze-infrared absorption hauv silicon, uas yuav ua rau txo cov nqi hauv cov khoom siv photonic ua tau zoo, thiab pab pawg tshawb fawb UC Davis tab tom tsim ib txoj hauv kev tshiab los txhim kho qhov kev nqus lub teeb hauv cov yeeb yaj kiab nyias silicon. Hauv lawv daim ntawv tshaj tawm tshiab ntawm Advanced Photonics Nexus, lawv tau ua qauv qhia thawj zaug ntawm kev sim ua qauv ntawm lub photodetector silicon-based nrog cov qauv micro-thiab nano-surface capturing light, ua tiav kev txhim kho kev ua tau zoo tsis tau muaj dua piv rau GaAs thiab lwm yam III-V pawg semiconductors. Lub photodetector muaj ib lub micron-tuab cylindrical silicon phaj tso rau ntawm ib lub substrate insulating, nrog cov hlau "ntiv tes" txuas ntxiv mus rau hauv ib tug ntiv tes-fork fashion los ntawm cov hlau sib cuag ntawm sab saum toj ntawm lub phaj. Qhov tseem ceeb, lub lumpy silicon yog puv nrog cov qhov voj voog teem rau hauv ib tug qauv periodic uas ua raws li photon capture sites. Lub qauv tag nrho ntawm lub cuab yeej ua rau lub teeb feem ntau tshwm sim kom khoov los ntawm yuav luag 90 ° thaum nws ntaus qhov chaw, cia nws propagate laterally raws Si dav hlau. Cov hom kev nthuav dav sab nraud no ua rau lub teeb mus ncig ntev dua thiab ua rau nws qeeb dua, ua rau muaj kev sib cuam tshuam ntau dua ntawm lub teeb thiab yog li ntawd kev nqus dej ntau dua.
Cov kws tshawb nrhiav kuj tau ua qhov kev sim ua piv txwv thiab kev tshuaj xyuas theoretical kom nkag siab zoo dua txog cov teebmeem ntawm cov qauv ntes photon, thiab tau ua ntau qhov kev sim sib piv cov photodetectors nrog thiab tsis muaj lawv. Lawv pom tias kev ntes photon ua rau muaj kev txhim kho zoo hauv kev nqus broadband hauv NIR spectrum, nyob siab dua 68% nrog lub ncov ntawm 86%. Nws tsim nyog sau tseg tias nyob rau hauv qhov ze infrared band, qhov coefficient absorption ntawm photon ntes photodetector yog ntau zaus siab dua li ntawm silicon ib txwm muaj, tshaj gallium arsenide. Tsis tas li ntawd, txawm hais tias qhov kev tsim qauv tau thov yog rau 1μm tuab silicon phaj, kev sim ua ntawm 30 nm thiab 100 nm silicon zaj duab xis sib xws nrog CMOS electronics qhia txog kev ua tau zoo zoo sib xws.
Zuag qhia tag nrho, cov txiaj ntsig ntawm txoj kev tshawb fawb no qhia tau hais tias muaj lub tswv yim zoo rau kev txhim kho kev ua tau zoo ntawm cov duab thaij duab silicon hauv cov ntawv thov photonics tshiab. Kev nqus tau siab tuaj yeem ua tiav txawm tias nyob rau hauv cov txheej silicon ultra-thin, thiab lub voj voog parasitic capacitance tuaj yeem khaws cia qis, uas yog qhov tseem ceeb hauv cov kab ke ceev ceev. Tsis tas li ntawd, txoj kev tau hais tawm yog sib xws nrog cov txheej txheem tsim khoom CMOS niaj hnub thiab yog li ntawd muaj peev xwm hloov pauv txoj hauv kev optoelectronics tau koom ua ke rau hauv cov voj voog ib txwm muaj. Qhov no, ua rau, tuaj yeem ua rau muaj kev dhia loj hauv cov tes hauj lwm computer ultrafast pheej yig thiab cov thev naus laus zis duab.