Isitholi sesithombe se-InGaAs esisodwa

I-photon eyodwaIsitholi sezithombe se-InGaAs

Ngokuthuthuka okusheshayo kwe-LiDAR,ukutholwa kokukhanyaubuchwepheshe kanye nobuchwepheshe obuhlukahlukene obusetshenziselwa ubuchwepheshe bokuthwebula izithombe zokulandelela izimoto ngokuzenzakalela bunezidingo eziphakeme, ukuzwela kanye nokulungiswa kwesikhathi kwe-detector esetshenziswa kubuchwepheshe bendabuko bokuthola ukukhanya okuphansi akukwazi ukuhlangabezana nezidingo zangempela. I-photon eyodwa iyiyunithi encane kakhulu yamandla okukhanya, futhi i-detector enekhono lokuthola i-photon eyodwa iyithuluzi lokugcina lokuthola ukukhanya okuphansi. Uma kuqhathaniswa ne-InGaAsIsitholi sezithombe se-APD, izitholi ze-photon eyodwa ezisekelwe ku-InGaAs APD photodetector zinesivinini esikhulu sokuphendula, ukuzwela kanye nokusebenza kahle. Ngakho-ke, uchungechunge locwaningo mayelana nezitholi ze-photon ze-IN-GAAS APD photodetector olulodwa luye lwenziwa ekhaya nakwamanye amazwe.

Abacwaningi baseNyuvesi yaseMilan e-Italy baqale bathuthukisa imodeli enezinhlangothi ezimbili ukuze balingise ukuziphatha kwesikhashana kwe-photon eyodwaumshini wokuthola izithombe we-avalanchengo-1997, futhi wanikeza imiphumela yokulingisa ngezinombolo yezimpawu zesikhashana ze-photon avalanche photodetector eyodwa. Kwabe sekuthi ngo-2006, abacwaningi basebenzisa i-MOCVD ukulungiselela i-planar geometricIsitholi sezithombe se-InGaAs APDi-single photon detector, eyandisa ukusebenza kahle kokuthola i-single-photon ibe yi-10% ngokunciphisa ungqimba olukhanyayo nokuthuthukisa insimu kagesi endaweni engafani. Ngo-2014, ngokuthuthukisa izimo zokusabalalisa kwe-zinc nokwenza ngcono isakhiwo esiqondile, i-single-photon detector inekhono eliphezulu lokuthola, kufika ku-30%, futhi ifinyelela i-timing jitter engaba ngu-87 ps. Ngo-2016, u-SANZARO M nabanye bahlanganise i-InGaAs APD photodetector single-photon detector ene-monolithic integrated resistor, baklama i-compact single-photon count module esekelwe ku-detector, futhi baphakamisa indlela yokucima i-hybrid eyanciphisa kakhulu i-avalanche charge, ngaleyo ndlela banciphise i-post-pulse kanye ne-optical crosstalk, futhi banciphise i-timing jitter ibe yi-70 ps. Ngesikhathi esifanayo, amanye amaqembu ocwaningo nawo enze ucwaningo ku-InGaAs APDumshini wokuthola izithombeisitholi se-photon esisodwa. Isibonelo, iPrinceton Lightwave iklame isitholi se-photon esisodwa se-InGaAs/InPAPD esinesakhiwo esihleliwe futhi yasisebenzisa kwezentengiselwano. I-Shanghai Institute of Technical Physics ihlole ukusebenza kwe-photon eyodwa kwe-APD photodetector isebenzisa ukususwa kwama-zinc deposits kanye nemodi ye-capacitive balanced gate pulse ene-dark count engu-3.6 × 10 ⁻⁴/ns pulse ngemvamisa ye-pulse engu-1.5 MHz. UJoseph P nabanye baklame isakhiwo se-mesa i-InGaAs APD photodetector single photon detector ene-bandgap ebanzi, futhi basebenzise i-InGaAsP njengento ebamba ungqimba ukuze bathole inani eliphansi lomnyama ngaphandle kokuthinta ukusebenza kahle kokuthola.

Imodi yokusebenza ye-InGaAs APD photodetector single photon detector iyimodi yokusebenza yamahhala, okungukuthi, i-APD photodetector idinga ukucima isekethe elingaphandle ngemva kokuba kwenzeke i-avalanche, bese ilulama ngemva kokucima isikhathi esithile. Ukuze kuncishiswe umthelela wesikhathi sokubambezeleka kokucima, ihlukaniswe cishe izinhlobo ezimbili: Eyokuqala ukusebenzisa isekethe yokucima engasebenzi noma esebenzayo ukufeza ukucima, njengesekethe yokucima esebenzayo esetshenziswa yi-R Thew, njll. Umfanekiso (a), (b) umdwebo olula wesekethe yokulawula kagesi kanye nesekethe yokucima esebenzayo kanye nokuxhumana kwayo ne-APD photodetector, eyakhelwe ukusebenza kwimodi yokugijima evaliwe noma ekhululekile, kunciphisa kakhulu inkinga yokushaya kwenhliziyo ngemuva kokushaya kwenhliziyo eyayingakaze ibonwe ngaphambili. Ngaphezu kwalokho, ukusebenza kahle kokuthola ku-1550 nm kungu-10%, futhi amathuba okushaya kwenhliziyo ngemuva kokushaya kwenhliziyo ancishiswe abe ngaphansi kuka-1%. Okwesibili ukuqaphela ukucima kwenhliziyo okusheshayo nokubuyisa ngokulawula izinga le-voltage ye-bias. Njengoba kungancikile ekulawulweni kwempendulo kwe-avalanche pulse, isikhathi sokubambezeleka sokucima sincishiswa kakhulu futhi ukusebenza kahle kokuthola kwe-detector kuyathuthukiswa. Isibonelo, u-LC Comandar nabanye basebenzisa imodi evalwe ngegedi. I-gated single-photon detector esekelwe ku-InGaAs/InPAPD yalungiswa. Ukusebenza kahle kokuthola i-single-photon kwakungaphezu kuka-55% ku-1550 nm, futhi amathuba okuthola i-post-pulse angu-7% afinyelelwe. Ngalesi sisekelo, i-University of Science and Technology of China yasungula uhlelo lwe-liDAR isebenzisa i-multi-mode fiber ngesikhathi esisodwa ehlanganiswe ne-free-mode InGaAs APD photodetector single-photon detector. Imishini yokuhlola iboniswe kuMfanekiso (c) no-(d), futhi ukutholwa kwamafu anezingqimba eziningi anokuphakama kwamakhilomitha ayi-12 kufezwa ngesisombululo sesikhathi esingu-1 s kanye nesisombululo sendawo esingu-15 m.