Chowunikira zithunzi cha InGaAs chimodzi

Chithunzi chimodziChowunikira zithunzi cha InGaAs

Ndi chitukuko chachangu cha LiDAR,kuzindikira kuwalaUkadaulo ndi ukadaulo wosiyanasiyana womwe umagwiritsidwa ntchito pojambula zithunzi zotsata magalimoto zokha ulinso ndi zofunikira kwambiri, kukhudzidwa ndi nthawi ya chowunikira chomwe chimagwiritsidwa ntchito muukadaulo wachikhalidwe wozindikira kuwala kochepa sikungakwaniritse zosowa zenizeni. Photon imodzi ndiye gawo laling'ono kwambiri la mphamvu ya kuwala, ndipo chowunikira chomwe chili ndi kuthekera kozindikira kuwala kamodzi ndiye chida chomaliza chowunikira kuwala kochepa. Poyerekeza ndi InGaAsChowunikira zithunzi cha APD, zozindikira za photon imodzi zochokera ku InGaAs APD photodetector zimakhala ndi liwiro lakuyankhidwa, kukhudzidwa komanso kugwira ntchito bwino kwambiri. Chifukwa chake, kafukufuku wotsatizana pa zozindikira za photon imodzi za IN-GAAS APD photodetector imodzi zachitika kunyumba ndi kunja.

Ofufuza ochokera ku Yunivesite ya Milan ku Italy adapanga koyamba chitsanzo cha magawo awiri kuti chizitsanzira khalidwe losakhalitsa la photon imodzichowunikira zithunzi cha chipale chofewamu 1997, ndipo adapereka zotsatira zoyeserera manambala za makhalidwe osakhalitsa a chowunikira chimodzi cha photon avalanche. Kenako mu 2006, ofufuzawo adagwiritsa ntchito MOCVD kukonzekera geometric yolinganizidwaChowunikira zithunzi cha InGaAs APDchowunikira cha photon imodzi, chomwe chinawonjezera mphamvu yozindikira ya single-photon kufika pa 10% mwa kuchepetsa gawo lowunikira ndikuwonjezera mphamvu yamagetsi pa malo olumikizirana osiyanasiyana. Mu 2014, popititsa patsogolo mikhalidwe ya kufalikira kwa zinc ndikukonza kapangidwe koyima, chowunikira cha single-photon chili ndi mphamvu yozindikira yapamwamba, mpaka 30%, ndipo chimakwaniritsa kugwedezeka kwa nthawi pafupifupi 87 ps. Mu 2016, SANZARO M et al. adaphatikiza chowunikira cha InGaAs APD photodetector single-photon ndi choletsa cholumikizidwa cha monolithic, adapanga gawo laling'ono lowerengera la single-photon kutengera chowunikira, ndipo adapereka njira yozimitsira yosakanikirana yomwe imachepetsa kwambiri mphamvu ya avalanche, motero amachepetsa post-pulse ndi optical crosstalk, ndikuchepetsa kugwedezeka kwa nthawi kufika pa 70 ps. Nthawi yomweyo, magulu ena ofufuza nawonso adachita kafukufuku pa InGaAs APDchowunikira zithunziChowunikira ma photon chimodzi. Mwachitsanzo, Princeton Lightwave yapanga chowunikira ma photon chimodzi cha InGaAs/InPAPD chokhala ndi kapangidwe ka pulanara ndipo chinagwiritsidwa ntchito pamalonda. Shanghai Institute of Technical Physics inayesa momwe APD photodetector imagwirira ntchito pogwiritsa ntchito kuchotsa zinc deposits ndi capacitive balanced gate pulse mode yokhala ndi dark count ya 3.6 × 10 ⁻⁴/ns pulse pa pulse frequency ya 1.5 MHz. Joseph P ndi anzake adapanga mesa structure ya InGaAs APD photodetector single photon detector yokhala ndi bandgap yokulirapo, ndipo adagwiritsa ntchito InGaAsP ngati zinthu zoyamwitsa kuti apeze dark count yocheperako popanda kusokoneza magwiridwe antchito ozindikira.

Njira yogwiritsira ntchito ya InGaAs APD photodetector single photon detector ndi njira yogwiritsira ntchito yaulere, ndiko kuti, APD photodetector iyenera kuzimitsa dera lozungulira pambuyo poti chipale chofewa chagwa, ndikuchira pambuyo poti chazimitsidwa kwa nthawi ndithu. Pofuna kuchepetsa mphamvu ya nthawi yochedwetsa kuzimitsidwa, imagawidwa m'mitundu iwiri: Choyamba ndi kugwiritsa ntchito dera lozimitsira lokhalokha kapena logwira ntchito kuti lizimitse, monga dera lozimitsira logwira ntchito lomwe limagwiritsidwa ntchito ndi R Thew, ndi zina zotero. Chithunzi (a), (b) ndi chithunzi chosavuta cha dera lolamulira lamagetsi ndi dera lozimitsira logwira ntchito komanso kulumikizana kwake ndi APD photodetector, lomwe lapangidwa kuti ligwire ntchito mu geti kapena free running mode, kuchepetsa kwambiri vuto la post-pulse lomwe silinachitikepo kale. Kuphatikiza apo, mphamvu yozindikira pa 1550 nm ndi 10%, ndipo mwayi wa post-pulse umachepetsedwa kufika pa 1%. Chachiwiri ndikupeza kuzimitsidwa mwachangu ndi kuchira mwa kuwongolera kuchuluka kwa mphamvu ya bias. Popeza sizidalira kuwongolera kwa kugunda kwa avalanche, nthawi yochedwa yozimitsa imachepa kwambiri ndipo luso lozindikira la detector limakula. Mwachitsanzo, LC Comandar ndi anzake amagwiritsa ntchito njira yotetezedwa. Chowunikira cha single-photon chotetezedwa pogwiritsa ntchito InGaAs/InPAPD chinakonzedwa. Mphamvu yozindikira single-photon inali yoposa 55% pa 1550 nm, ndipo mwayi wopeza post-pulse wa 7% unapezeka. Pachifukwa ichi, University of Science and Technology of China idakhazikitsa dongosolo la liDAR pogwiritsa ntchito ulusi wa multi-mode nthawi imodzi ndi chowunikira cha free-mode InGaAs APD photodetector single-photon. Zipangizo zoyesera zikuwonetsedwa pa Chithunzi (c) ndi (d), ndipo kuzindikira mitambo ya multi-layer yokhala ndi kutalika kwa 12 km kumachitika ndi nthawi yotsimikizika ya 1 s ndi malo otsimikizika a 15 m.