SPADib leeg-photon avalanche photodetector
Thaum SPAD photodetector sensors tau qhia thawj zaug, lawv feem ntau yog siv rau hauv cov xwm txheej pom kev tsawg. Txawm li cas los xij, nrog rau kev hloov pauv ntawm lawv cov kev ua tau zoo thiab kev txhim kho ntawm qhov chaw xav tau,SPAD lub koob yees duabCov sensors tau siv ntau dua hauv cov xwm txheej ntawm cov neeg siv khoom xws li tsheb radars, robots, thiab cov tsheb tsis muaj neeg tsav. Vim nws qhov kev nkag siab siab thiab cov yam ntxwv suab nrov qis, SPAD photodetector sensor tau dhau los ua qhov kev xaiv zoo tshaj plaws rau kev ua tiav qhov kev nkag siab tob thiab kev thaij duab qis.
Tsis zoo li cov cuab yeej CMOS duab sensors (CIS) ib txwm muaj raws li PN junctions, lub hauv paus ntawm SPAD photodetector yog lub avalanche diode ua haujlwm hauv Geiger hom. Los ntawm qhov kev xav ntawm cov txheej txheem lub cev, qhov nyuaj ntawm SPAD photodetector yog siab dua li ntawm PN junction devices. Qhov no feem ntau yog qhov tseeb tias nyob rau hauv qhov siab rov qab bias, nws yuav ua rau muaj teeb meem xws li kev txhaj tshuaj ntawm cov neeg nqa khoom tsis sib npaug, thermal electron effects, thiab tunneling currents pab los ntawm cov xeev tsis zoo. Cov yam ntxwv no ua rau nws ntsib teeb meem loj heev ntawm kev tsim qauv, txheej txheem, thiab cov qauv vaj huam sib luag.
Cov kev ua tau zoo ntawmSPAD avalanche photodetectorsuav nrog Pixel Loj (Pixel Loj), suab nrov suav tsaus (DCR), qhov muaj peev xwm pom lub teeb (PDE), lub sijhawm tuag (DeadTime), thiab lub sijhawm teb (Response Time). Cov kev ntsuas no cuam tshuam ncaj qha rau kev ua haujlwm ntawm SPAD avalanche photodetector. Piv txwv li, qhov nqi suav tsaus (DCR) yog qhov tseem ceeb rau kev txhais lub suab nrov ntes, thiab SPAD yuav tsum tswj hwm qhov kev cuam tshuam siab dua li qhov tawg kom ua haujlwm ua lub tshuab ntes ib-photon. Qhov muaj peev xwm ntawm kev pom lub teeb (PDE) txiav txim siab qhov rhiab heev ntawm SPAD.lub tshuab ntes duab av qeegthiab raug cuam tshuam los ntawm qhov muaj zog thiab kev faib tawm ntawm lub zog hluav taws xob. Tsis tas li ntawd, DeadTime yog lub sijhawm xav tau rau SPAD rov qab mus rau nws lub xeev pib tom qab raug ua kom raug, uas cuam tshuam rau qhov siab tshaj plaws ntawm photon nrhiav pom thiab dynamic range.
Hauv kev ua kom zoo dua ntawm SPAD cov khoom siv, kev sib raug zoo ntawm cov kev ua tau zoo tseem ceeb yog qhov kev sib tw loj: piv txwv li, pixel miniaturization ncaj qha ua rau PDE attenuation, thiab qhov concentration ntawm ntug hluav taws xob teb los ntawm qhov loj me me kuj tseem yuav ua rau muaj kev nce ntxiv hauv DCR. Kev txo lub sijhawm tuag yuav ua rau muaj suab nrov tom qab-impulse thiab ua rau qhov tseeb ntawm lub sijhawm jitter tsis zoo. Tam sim no, qhov kev daws teeb meem txiav-ntug tau ua tiav qee qib ntawm kev sib koom tes ua haujlwm los ntawm cov txheej txheem xws li DTI / kev tiv thaiv voj voog (suppressing crosstalk thiab txo DCR), pixel optical optimization, kev qhia txog cov ntaub ntawv tshiab (SiGe avalanche txheej txhim kho infrared teb), thiab peb-seem stacked active quenching circuits.
Lub sijhawm tshaj tawm: Lub Xya Hli-23-2025