Ib-photon photodetectortau tawg los ntawm 80% efficiency bottleneck
Ib leeg-photonphotodetectoryog dav siv nyob rau hauv lub teb ntawm quantum photonics thiab ib leeg-photon imaging vim lawv cov compact thiab tsawg-nqi zoo, tab sis lawv yog confronted nrog cov nram qab no technical bottlenecks.
Cov kev txwv tam sim no
1.CMOS thiab nyias-hluav taws xob SPAD: Txawm hais tias lawv muaj kev sib koom ua ke siab thiab tsis tshua muaj lub sij hawm jitter, cov txheej txheem nqus yog nyias (ob peb micrometers), thiab PDE txwv nyob rau thaj tsam ze-infrared, tsuas yog li 32% ntawm 850 nm.
2. Thick-hluav taws xob SPAD: Nws nta ib txheej nqus kaum ntawm micrometers tuab. Cov khoom lag luam muaj PDE ntawm kwv yees li 70% ntawm 780 nm, tab sis tawg mus txog 80% yog qhov nyuaj heev.
3. Nyeem tawm cov kev txwv hauv Circuit Court: Thick-junction SPAD yuav tsum muaj qhov hluav taws xob overbias ntawm tshaj 30V kom ntseeg tau tias muaj qhov tshwm sim siab avalanche. Txawm tias muaj quenching voltage ntawm 68V nyob rau hauv ib txwm circuits, PDE tsuas yog nce mus rau 75.1%.
Kev daws
Optimize lub semiconductor qauv ntawm SPAD. Back-illuminated design: Teeb meem photons decay exponentially hauv silicon. Lub nraub qaum-illuminated qauv xyuas kom meej tias feem ntau ntawm photons yog absorbed nyob rau hauv lub nqus txheej, thiab cov generated electrons yog txhaj rau hauv lub avalanche cheeb tsam. Vim hais tias ionization tus nqi ntawm electrons nyob rau hauv silicon yog siab tshaj qhov ntawm qhov, electron txhaj muab ib tug ntau dua probability ntawm avalanche. Doping nyiaj avalanche cheeb tsam: Los ntawm kev siv cov txheej txheem nruam diffusion ntawm boron thiab phosphorus, qhov ntiav doping yog them nyiaj rau mloog cov hluav taws xob hauv cheeb tsam sib sib zog nqus nrog tsawg siv lead ua tsis xws luag, zoo txo suab nrov xws li DCR.
2. Kev ua haujlwm siab nyeem ntawv Circuit Court. 50V siab amplitude quenching ceev lub xeev hloov; Multimodal kev ua haujlwm: Los ntawm kev sib txuas FPGA tswj QUENCHING thiab RESET cov cim, hloov pauv hloov pauv ntawm kev ua haujlwm dawb (cim qhia), rooj vag (sab nraud GATE tsav), thiab hybrid hom tiav.
3. Kev npaj thiab ntim khoom. Cov txheej txheem SPAD wafer tau txais yuav, nrog lub pob npauj npaim. Lub SPAD yog sib koom ua ke rau AlN cab kuj substrate thiab vertically ntsia rau ntawm lub thermoelectric cooler (TEC), thiab kub tswj tau tiav los ntawm ib tug thermistor. Multimode optical fibers tau ua raws nraim nrog SPAD chaw kom ua tiav kev sib txuas zoo.
4. Kev ua haujlwm calibration. Calibration tau ua tiav siv 785 nm picosecond pulsed laser diode (100 kHz) thiab lub sij hawm-digital converter (TDC, 10 ps daws teeb meem).
Cov ntsiab lus
Los ntawm kev ua kom zoo ntawm SPAD qauv (thick hlws ris, rov qab-illuminated, doping nyiaj) thiab innovating lub 50 V quenching Circuit Court, txoj kev tshawb no tau ntse thawb PDE ntawm silicon-raws li ib-photon detector rau qhov siab tshiab ntawm 84.4%. Piv nrog rau cov khoom lag luam, nws cov kev ua tau zoo tau zoo dua qub, muab cov tswv yim daws teeb meem rau kev siv xws li kev sib txuas lus quantum, quantum xam, thiab cov duab rhiab heev uas xav tau ultra-siab efficiency thiab hloov tau yooj yim. Txoj haujlwm no tau tsim lub hauv paus ruaj khov rau kev txhim kho ntxiv ntawm silicon-basedib leeg-photon detectortshuab.
Post lub sij hawm: Oct-28-2025