Kupita patsogolo kwaposachedwa kwa zida zowonera mafunde a avalanche zomwe zimakhala ndi mphamvu zambiri

Kupita patsogolo kwaposachedwa muzowunikira zithunzi za avalanche zomwe zimakhala ndi mphamvu zambiri

Kutentha kwa chipinda ndi 1550 nmchowunikira cha photodiode cha avalanche

Mu gulu la near infrared (SWIR), ma avalanche diode okhala ndi mphamvu yothamanga kwambiri amagwiritsidwa ntchito kwambiri polankhulana ndi optoelectronic ndi ntchito za liDAR. Komabe, avalanche photodiode (APD) yomwe ili pafupi ndi infrared yomwe imayang'aniridwa ndi Indium gallium arsenic avalanche breakdown diode (InGaAs APD) nthawi zonse yakhala ikuchepetsedwa ndi phokoso la ionization la random collision la zipangizo zachikhalidwe zochulukitsa, indium phosphide (InP) ndi indium aluminium arsenic (InAlAs), zomwe zimapangitsa kuti kukhudzidwa kwa chipangizocho kuchepe kwambiri. Kwa zaka zambiri, ofufuza ambiri akufufuza mwachangu zipangizo zatsopano za semiconductor zomwe zimagwirizana ndi InGaAs ndi InP optoelectronic platform processes ndipo zimakhala ndi mphamvu yotsika kwambiri ya ionization yofanana ndi zipangizo za silicon zambiri.

Chowunikira chatsopano cha 1550 nm avalanche photodiode chimathandiza kupanga makina a LiDAR

Gulu la ofufuza ku United Kingdom ndi ku United States kwa nthawi yoyamba lapanga bwino chipangizo chatsopano chowunikira zithunzi cha 1550 nm APD (chodziwika bwino kwambiri).chowunikira zithunzi cha chipale chofewa), chitukuko chomwe chikulonjeza kusintha kwambiri magwiridwe antchito a makina a LiDAR ndi mapulogalamu ena a optoelectronic.

Zipangizo zatsopano zimapereka ubwino waukulu

Chofunika kwambiri pa kafukufukuyu ndi kugwiritsa ntchito zinthu mwanzeru. Ofufuzawo anasankha GaAsSb ngati gawo loyamwitsa ndi AlGaAsSb ngati gawo lochulukitsa. Kapangidwe kameneka kamasiyana ndi InGaAs/InP yachikhalidwe ndipo kamabweretsa zabwino zazikulu:

1.GaAsSb absorption layer: GaAsSb ili ndi absorption coefficient yofanana ndi InGaAs, ndipo kusintha kuchokera ku GaAsSb absorption layer kupita ku AlGaAsSb (multiplier layer) kumakhala kosavuta, kuchepetsa zotsatira za trap ndikukweza liwiro ndi mphamvu ya chipangizocho.

2. AlGaAsSb multiplier layer: AlGaAsSb multiplier layer ndi yabwino kuposa InP ndi InAlAs multiplier layer yachikhalidwe pakugwira ntchito. Imawonekera makamaka mu kuchuluka kwakukulu pa kutentha kwa chipinda, bandwidth yayikulu komanso phokoso lochepa kwambiri.

Ndi zizindikiro zabwino kwambiri zogwirira ntchito

ChatsopanoChowunikira zithunzi cha APD(chowunikira kuwala kwa dzuwa) chimaperekanso kusintha kwakukulu paziwerengero za magwiridwe antchito:

1. Kuchuluka kwa 278 kunapezeka pa kutentha kwa chipinda, ndipo posachedwapa Dr. Jin Xiao anasintha njira yokonza kapangidwe kake ndi njira yake, ndipo kuchuluka kwa 278 kunawonjezeka kufika pa M=1212.

2. Phokoso lochepa kwambiri: limasonyeza phokoso lochepa kwambiri (F < 3, gain M = 70; F < 4, gain M = 100).

3. Kugwiritsa ntchito bwino kwa quantum: pansi pa phindu lalikulu, kugwiritsa ntchito bwino kwa quantum kuli pamlingo wofanana ndi 5935.3%. Kukhazikika kwa kutentha kwakukulu: kusinthasintha kwa kutentha pa kutentha kochepa kuli pafupifupi 11.83 mV/K.

Chithunzi 1 Phokoso lochulukirapo la APDzipangizo zowunikira zithunzipoyerekeza ndi chipangizo china chowunikira zithunzi cha APD

Mapeto ambiri a ntchito

APD yatsopanoyi ili ndi tanthauzo lofunikira pa machitidwe a liDAR ndi mapulogalamu a photon:

1. Chiŵerengero chabwino cha ma signaling-to-noise: Kuchuluka kwa ma gain ndi ma noise otsika kumathandizira kwambiri chiŵerengero cha ma signaling-to-noise, chomwe ndi chofunikira kwambiri pakugwiritsa ntchito m'malo omwe alibe photon, monga kuyang'anira mpweya wowonjezera kutentha.

2. Kugwirizana kwamphamvu: Chowunikira zithunzi chatsopano cha APD (chowunikira zithunzi cha avalanche) chapangidwa kuti chigwirizane ndi nsanja zamakono za indium phosphide (InP), kuonetsetsa kuti kulumikizana bwino ndi machitidwe olumikizirana amalonda omwe alipo.

3. Kugwiritsa ntchito bwino kwambiri: Kumatha kugwira ntchito bwino kutentha kwa chipinda popanda njira zovuta zoziziritsira, zomwe zimapangitsa kuti zikhale zosavuta kugwiritsa ntchito pazinthu zosiyanasiyana zothandiza.

Kupanga kwa chipangizo chatsopano cha 1550 nm SACM APD chowunikira zithunzi (chowunikira zithunzi cha avalanche) chikuyimira chitukuko chachikulu m'munda, Kuthetsa zoletsa zazikulu zokhudzana ndi phokoso lochulukirapo ndi zinthu zopezera bandwidth mu mapangidwe achikhalidwe a APD chowunikira zithunzi (chowunikira zithunzi cha avalanche). Lusoli likuyembekezeka kukulitsa mphamvu za machitidwe a liDAR, makamaka m'makina a liDAR osayendetsedwa ndi anthu, komanso kulumikizana kwa malo omasuka.