Fotoni imodziInGaAs Photodetector
Ndi chitukuko chofulumira cha LiDAR, akuzindikira kuwalaukadaulo ndi umisiri wosiyanasiyana womwe umagwiritsidwa ntchito paukadaulo wongoyang'anira magalimoto odziwikiratu ulinso ndi zofunika zapamwamba, kukhudzika ndi kuwongolera nthawi kwa chowunikira chomwe chimagwiritsidwa ntchito muukadaulo wodziwira kuwala kocheperako sikungakwaniritse zosowa zenizeni. Single photon ndiye mphamvu yaying'ono kwambiri yowunikira, ndipo chojambulira chomwe chili ndi kuthekera kozindikira chithunzi chimodzi ndicho chida chomaliza chowunikira kuwala kochepa. Poyerekeza ndi InGaAsAPD Photodetector, zowunikira zamtundu umodzi zozikidwa pa InGaAs APD photodetector zili ndi liwiro loyankhira, tcheru komanso magwiridwe antchito. Chifukwa chake, zofufuza zingapo za IN-GAAS APD photodetector single photon detectors zachitika kunyumba ndi kunja.
Ofufuza a ku yunivesite ya Milan ku Italy anayamba kupanga chitsanzo cha mbali ziwiri kuti ayese khalidwe lachidule la photon imodzi.Photodetector ya avalanchemu 1997, ndipo adapereka zotsatira zofananira zamawerengero za mawonekedwe osakhalitsa a chowunikira chimodzi cha photon avalanche photodetector. Kenako mu 2006, ofufuzawo adagwiritsa ntchito MOCVD pokonzekera geometric planarInGaAs APD photodetectorchojambulira chimodzi cha photon, chomwe chinakulitsa luso la kuzindikira kwa chithunzi chimodzi kufika pa 10% mwa kuchepetsa wosanjikiza wonyezimira ndi kupititsa patsogolo mphamvu yamagetsi pa mawonekedwe osiyanasiyana. Mu 2014, popititsa patsogolo kufalikira kwa zinki ndikuwongolera mawonekedwe ake, chojambulira chokhala ndi chithunzi chimodzi chimakhala ndi mphamvu yodziwikiratu, mpaka 30%, ndipo chimakwaniritsa nthawi ya 87 ps. Mu 2016, SANZARO M et al. InGaAs APD photodetector single photon detector yokhala ndi monolithic Integrated resistor, inapanga gawo lowerengera la photon limodzi lokhazikika pa chojambulira, ndipo anakonza njira yozimitsira yosakanizidwa yomwe imachepetsa kwambiri chiwonongeko cha chiphalaphala, potero kuchepetsa kugunda kwapambuyo ndi kuwala kwa crosstalk, ndi kuchepetsa nthawi jitter ku 70 ps. Nthawi yomweyo, magulu ena ofufuza adachitanso kafukufuku wa InGaAs APDPhotodetectorchojambulira chokha cha photon. Mwachitsanzo, Princeton Lightwave adapanga InGaAs/InPAPD single photon detector yokhala ndi planar ndikuiyika kuti igwiritse ntchito malonda. Bungwe la Shanghai Institute of Technical Physics linayesa ntchito ya photon imodzi ya APD photodetector pogwiritsa ntchito kuchotsedwa kwa zinc deposits ndi capacitive balanced gate pulse mode ndi chiwerengero chakuda cha 3.6 × 10 ⁻⁴/ns pulse pafupipafupi 1.5 MHz. Joseph P ndi al. adapanga kapangidwe ka mesa InGaAs APD chojambulira chithunzi chimodzi chokhala ndi bandgap yotakata, ndipo adagwiritsa ntchito InGaAsP ngati zinthu zosanjikiza kuti apeze mdima wocheperako popanda kusokoneza kuzindikira.
Njira yogwiritsira ntchito InGaAs APD photodetector single photon detector ndi njira yaulere yogwiritsira ntchito, ndiko kuti, APD photodetector iyenera kuzimitsa dera lozungulira pambuyo pa chigumukire, ndikuchira pambuyo pozimitsa kwa nthawi. Pofuna kuchepetsa zotsatira za quenching kuchedwa nthawi, pafupifupi anawagawa mitundu iwiri: Mmodzi ndi ntchito kungokhala chete kapena yogwira quenching dera kukwaniritsa quenching, monga yogwira quenching dera ntchito R Thew, etc. Chithunzi (a), (b) ndi chophweka chojambula cha kulamulira kwamagetsi ndi yogwira quenching dera ndi kuthamanga kwake kugwirizana, amene wapanga chithunzi cha APD kapena kuchepetsa kwambiri ntchito ya APD. vuto lomwe silinachitikepo pambuyo pa kugunda kwa mtima. Komanso, kuzindikira kwa 1550 nm ndi 10%, ndipo mwayi wa post-pulse umachepetsedwa mpaka 1%. Chachiwiri ndikuzindikira kuzimitsa ndi kuchira mwachangu powongolera kuchuluka kwa voliyumu ya kukondera. Popeza sizitengera kuwongolera kwa mayankho a ma avalanche pulse, nthawi yochedwa yozimitsa imachepetsedwa kwambiri ndipo kuzindikira kwa chowunikira kumakhala bwino. Mwachitsanzo, LC Comandar et al amagwiritsa ntchito gated mode. Chowunikira chokhala ndi chithunzi chimodzi chozikidwa pa InGaAs/InPAPD chinakonzedwa. Kuzindikira kwa chithunzi chimodzi kunali kopitilira 55% pa 1550 nm, ndipo mwayi waposachedwa wa 7% unakwaniritsidwa. Pazifukwa izi, University of Science and Technology ya China idakhazikitsa dongosolo la liDAR logwiritsa ntchito ma multi-mode fiber nthawi imodzi limodzi ndi InGaAs APD photodetector single-photon detector. Zida zoyesera zikuwonetsedwa mu Chithunzi (c) ndi (d), ndipo kuzindikira kwa mitambo yamitundu yambiri yokhala ndi kutalika kwa 12 km kumazindikiridwa ndi nthawi ya 1 s ndi kusintha kwa malo a 15 m.
Nthawi yotumiza: May-07-2024