Inkqubela phambili yamva nje kwi-avalanche photodetectors

Inkqubela phambili yamva nje kwiUvakalelo oluphezulu lwe-avalanche photodetectors

Ubushushu begumbi buvakalelo oluphezulu 1550 nmUmtshina we-avalanche photodiode

Kwibhendi ekufutshane ye-infrared (SWIR), ubuntununtunu obuphezulu besantya esiphezulu se-avalanche diode zisetyenziswa ngokubanzi kunxibelelwano lwe-optoelectronic kunye nezicelo ze-liDAR. Nangona kunjalo, i-photodiode ye-avalanche yangoku ekufutshane ne-infrared (APD) elawulwa yi-Indium gallium arsenic avalanche breakdown diode (InGaAs APD) isoloko inqunyanyiswa yingxolo ye-ionization ye-random ionization yezinto eziqhelekileyo zendawo yobuninzi, i-indium phosphide (InP) kunye ne-indium ye-aluminium ye-arsenic (i-InAlAs isiphumo esibalulekileyo kwi-recensibility yesixhobo). Ukutyhubela iminyaka, abaphandi abaninzi bajonga ngenkuthalo izixhobo ezintsha ze-semiconductor ezihambelana ne-InGaAs kunye ne-InP optoelectronic iinkqubo zeqonga kwaye zinefuthe eliphantsi le-ionization yokusebenza kwengxolo efana nemathiriyeli ye-silicon eninzi.

Isixhobo se-1550 nm se-avalanche photodiode detector inceda uphuhliso lweenkqubo ze-LiDAR.

Iqela labaphandi e-United Kingdom nase-United States okokuqala ngqa baphuhlise ngempumelelo i-ultra-high sensitivity 1550 nm APD photodetector (i-avalanche photodetector), ukuphumelela okuthembisa ukuphucula kakhulu ukusebenza kweenkqubo ze-LiDAR kunye nezinye izicelo ze-optoelectronic.

Izixhobo ezitsha zibonelela ngeenzuzo eziphambili

Eyona nto ibalaseleyo kolu phando kukusetyenziswa kwezinto ezintsha. Abaphandi bakhetha i-GaAsSb njengoluhlu lwe-absorption kunye ne-AlGaAsSb njenge-multiplier layer. Olu luyilo lwahlukile kwi-InGaAs/InP yesintu kwaye izisa iingenelo ezibalulekileyo:

I-1.GaAsSb i-absorption layer: I-GaAsSb ine-coefficient yokufunxa efanayo kwi-InGaAs, kwaye inguqu esuka kwi-GaAsSb yokufunxa umaleko ukuya kwi-AlGaAsSb (i-multiplier layer) ilula, inciphisa umphumo womgibe kunye nokuphucula isantya kunye nokusebenza kakuhle kwesixhobo.

I-2.AlGaAsSb i-multiplier layer: I-AlGaAsSb i-multiplier layer iphezulu kune-InP yendabuko kunye ne-InAlAs yokuphindaphinda umaleko ekusebenzeni. Ibonakaliswa ikakhulu kwinzuzo ephezulu kubushushu begumbi, i-bandwidth ephezulu kunye nengxolo ephantsi kakhulu.

Ngezalathisi zokusebenza ezigqwesileyo

EntshaIsixhobo sokufota seAPD(i-avalanche photodiode detector) ikwabonelela ngophuculo olubalulekileyo kwiimetriki zokusebenza:

1. I-Ultra-high gain: I-ultra-high gain ye-278 ifunyenwe kwiqondo lokushisa, kwaye kungekudala uDkt Jin Xiao uphucule ukulungiswa kwesakhiwo kunye nenkqubo, kwaye inzuzo enkulu yonyuswa kwi-M = 1212.

2. Ingxolo ephantsi kakhulu: ibonisa ingxolo ephantsi kakhulu ephantsi kakhulu (F <3, zuza i-M = 70; F<4, fumana i-M = 100).

3. Ukusebenza okuphezulu kwe-quantum: phantsi kwenzuzo ephezulu, ukusebenza kakuhle kwe-quantum kuphezulu njenge-5935.3%. Uzinzo olomeleleyo lobushushu: uvakalelo lokuqhekeka kwiqondo lobushushu eliphantsi limalunga ne-11.83 mV/K.

Umzobo 1 Ingxolo egqithisileyo ye-APDizixhobo zokufotaxa kuthelekiswa nenye iAPD photodetector

Amathemba osetyenziso olubanzi

Le APD entsha ineempembelelo ezibalulekileyo kwiinkqubo ze-liDAR kunye nezicelo zefoton:

1. Ukuphuculwa kwe-signal-to-noise ratio: Ukuzuza okuphezulu kunye neempawu eziphantsi zengxolo ziphucula ngokuphawulekayo umlinganiselo we-signal-to-noise, obaluleke kakhulu kwizicelo kwiindawo ze-photon-poor, ezifana nokubeka iliso kwi-greenhouse gas.

2. Ukuhambelana okuqinileyo: I-photodetector entsha ye-APD (i-avalanche photodetector) yenzelwe ukuba ihambelane neeplatifti ze-optoelectronics zangoku ze-indium phosphide (InP), ziqinisekisa ukuhlanganiswa okungenamthungo kunye neenkqubo zonxibelelwano ezikhoyo zorhwebo.

3. Ukusebenza okuphezulu okuphezulu: Inokusebenza ngokufanelekileyo kwiqondo lokushisa ngaphandle kweendlela zokupholisa eziyinkimbinkimbi, ukwenza lula ukuthunyelwa kwizicelo ezisebenzayo ezahlukeneyo.

Ukuphuhliswa kwesi sixhobo sitsha se-1550 nm SACM APD photodetector (i-avalanche photodetector) imele impumelelo enkulu kwintsimi, idilesi imida engundoqo ehambelana nengxolo egqithisileyo kunye nokufumana iimveliso ze-bandwidth kwi-APD photodetector yendabuko (i-avalanche photodetector) yoyilo. Olu lutsha lulindeleke ukuba lukhulise amandla eenkqubo ze-liDAR, ngakumbi kwiinkqubo ze-liDAR ezingenamntu, kunye nonxibelelwano lwendawo yasimahla.