Ib lub photon photodetector tau tawg los ntawm 80% kev ua haujlwm bottleneck

Ib lub photon photodetectortau tawg los ntawm 80% kev ua haujlwm tsis zoo

Ib-photonlub tshuab ntes duabtau siv dav hauv cov teb ntawm quantum photonics thiab ib-photon imaging vim lawv cov txiaj ntsig compact thiab pheej yig, tab sis lawv ntsib nrog cov teeb meem kev siv tshuab hauv qab no.

Cov kev txwv tam sim no

1.CMOS thiab thin-junction SPAD: Txawm hais tias lawv muaj kev sib koom ua ke siab thiab lub sijhawm qis jitter, cov txheej nqus yog nyias (ob peb micrometers), thiab PDE raug txwv hauv thaj chaw ze-infrared, nrog tsuas yog li 32% ntawm 850 nm.

2. SPAD sib txuas tuab: Nws muaj ib txheej nqus uas tuab kaum micrometers. Cov khoom lag luam muaj PDE kwv yees li 70% ntawm 780 nm, tab sis kev tawg dhau 80% yog qhov nyuaj heev.

3. Nyeem cov kev txwv ntawm lub voj voog: SPAD uas sib txuas tuab yuav tsum muaj lub zog hluav taws xob ntau dua 30V kom ntseeg tau tias muaj qhov muaj feem ntau ntawm av qeeg. Txawm tias muaj lub zog hluav taws xob quenching ntawm 68V hauv cov voj voog ib txwm muaj, PDE tsuas yog tuaj yeem nce mus txog 75.1%.

Kev daws teeb meem

Txhim kho cov qauv semiconductor ntawm SPAD. Kev tsim qauv rov qab ci ntsa iab: Cov photons tshwm sim lwj sai heev hauv silicon. Cov qauv rov qab ci ntsa iab ua kom ntseeg tau tias feem ntau ntawm cov photons raug nqus rau hauv txheej nqus, thiab cov electrons tsim tawm raug txhaj rau hauv thaj chaw avalanche. Vim tias tus nqi ionization ntawm cov electrons hauv silicon siab dua li ntawm qhov, kev txhaj tshuaj electron muab qhov muaj feem ntau ntawm avalanche. Doping compensation avalanche cheeb tsam: Los ntawm kev siv cov txheej txheem diffusion tas mus li ntawm boron thiab phosphorus, qhov doping ntiav raug them rov qab los ua kom lub zog hluav taws xob hauv thaj chaw tob nrog tsawg dua qhov tsis zoo ntawm cov siv lead ua, txo cov suab nrov xws li DCR.

2. Lub voj voog nyeem ntawv ua haujlwm siab. 50V siab amplitude quenching Kev hloov pauv sai ntawm lub xeev; Kev ua haujlwm ntau hom: Los ntawm kev sib txuas FPGA tswj QUENCHING thiab RESET cov teeb liab, kev hloov pauv yooj yim ntawm kev ua haujlwm dawb (lub teeb liab trigger), gating (sab nraud GATE tsav), thiab hybrid hom tau ua tiav.

3. Kev npaj khoom siv thiab ntim khoom. Cov txheej txheem SPAD wafer raug saws, nrog rau pob npauj npaim. SPAD raug khi rau AlN carrier substrate thiab ntsia ntsug rau ntawm lub thermoelectric cooler (TEC), thiab kev tswj kub tau ua tiav los ntawm lub thermistor. Cov fiber ntau hom optical tau sib dhos nrog lub chaw SPAD kom ua tiav kev sib txuas zoo.

4. Kev ntsuas kev ua tau zoo. Kev ntsuas tau ua tiav los ntawm kev siv 785 nm picosecond pulsed laser diode (100 kHz) thiab lub sijhawm-digital converter (TDC, 10 ps resolution).

Kev Txheeb Xyuas

Los ntawm kev ua kom zoo dua qhov SPAD qauv (kev sib tshuam tuab, rov qab-illuminated, doping compensation) thiab kev tsim kho tshiab ntawm 50 V quenching circuit, txoj kev tshawb fawb no tau thawb PDE ntawm silicon-based single-photon detector mus rau qhov siab tshiab ntawm 84.4%. Piv nrog cov khoom lag luam, nws cov kev ua tau zoo tau txhim kho ntau heev, muab cov kev daws teeb meem rau cov ntawv thov xws li kev sib txuas lus quantum, quantum computing, thiab high-sensitivity imaging uas xav tau ultra-high efficiency thiab kev ua haujlwm yooj ywm. Cov haujlwm no tau tso lub hauv paus ruaj khov rau kev txhim kho ntxiv ntawm silicon-basedib lub tshuab ntes photonthev naus laus zis.