Kupita patsogolo kwaposachedwa kwa ma sensitivity avalanche photodetectors

Zowonjezera zaposachedwa muhigh sensitivity avalanche photodetectors

Chipinda kutentha kwambiri tilinazo 1550 nmchowunikira cha avalanche photodiode

Mu bandi yapafupi ya infrared (SWIR), ma diode othamanga kwambiri amathamanga kwambiri amagwiritsidwa ntchito kwambiri polumikizana ndi optoelectronic ndi kugwiritsa ntchito liDAR. Komabe, panopa pafupi-infuraredi chigumukire photodiode (APD) wolamulidwa ndi Indium gallium arsenic chigumukire breakdown diode (InGaAs APD) wakhala malire ndi mwachisawawa kugunda ionization phokoso la chikhalidwe multiplier zipangizo dera, indium phosphide (InP) ndi indium zitsulo zotayidwa arsenic arsenic (InAlAs mu mphamvu ya reduction). Kwa zaka zambiri, ofufuza ambiri akuyang'ana mwachangu zida zatsopano za semiconductor zomwe zimagwirizana ndi InGaAs ndi InP optoelectronic platform process ndipo zimakhala ndi phokoso lotsika kwambiri la ionization phokoso lofanana ndi zida zambiri za silicon.

Chowunikira chatsopano cha 1550 nm avalanche photodiode chimathandizira kupanga makina a LiDAR.

Gulu la ofufuza ku United Kingdom ndi United States kwa nthawi yoyamba apanga bwino chipangizo chatsopano cha ultra-high sensitivity 1550 nm APD photodetector (Photodetector ya avalanche), kupambana komwe kumalonjeza kupititsa patsogolo kwambiri machitidwe a LiDAR ndi ntchito zina za optoelectronic.

Zida zatsopano zimapereka maubwino ofunikira

Chochititsa chidwi kwambiri pa kafukufukuyu ndi kugwiritsa ntchito zida zatsopano. Ofufuzawo adasankha GaAsSb ngati gawo la mayamwidwe ndi AlGaAsSb ngati gawo lochulukitsa. Mapangidwe awa amasiyana ndi InGaAs/InP akale ndipo amabweretsa zabwino zambiri:

1.GaAsSb absorption layer: GaAsSb ili ndi coefficient yoyamwitsa yofanana ndi InGaAs, ndipo kusintha kuchokera ku GaAsSb kuyamwitsa wosanjikiza kupita ku AlGaAsSb (multiplier layer) ndikosavuta, kuchepetsa mphamvu ya msampha ndikuwongolera liwiro ndi kuyamwa kwa chipangizocho.

2.AlGaAsSb multiplier layer: AlGaAsSb multiplier layer ndipamwamba kuposa inP yachikhalidwe ndi InAlAs multiplier layer mu ntchito. Zimawonetsedwa makamaka ndi kupindula kwakukulu kutentha kwa chipinda, bandwidth yapamwamba komanso phokoso lapamwamba kwambiri.

Ndi zizindikiro zabwino kwambiri zogwirira ntchito

ChatsopanoAPD Photodetector(avalanche photodiode detector) imaperekanso kusintha kwakukulu pamagwiritsidwe ntchito:

1. Kupindula kwakukulu: Kupindula kwakukulu kwa 278 kunapezedwa kutentha kwa firiji, ndipo posachedwa Dr. Jin Xiao adawongolera kukhathamiritsa kwa dongosolo ndi ndondomeko, ndipo phindu lalikulu linawonjezeka kufika M = 1212.

2. Phokoso lotsika kwambiri: likuwonetsa phokoso lotsika kwambiri (F <3, pezani M = 70; F<4, pezani M=100).

3. Kuchita bwino kwambiri kwachulukidwe: pansi pa kupindula kwakukulu, mphamvu ya quantum ndiyokwera kwambiri mpaka 5935.3%. Kukhazikika kwa kutentha kwamphamvu: kukhudzidwa kwapang'onopang'ono pa kutentha kochepa kuli pafupifupi 11.83 mV/K.

Chithunzi 1 Phokoso lambiri la APDzipangizo za photodetectorpoyerekeza ndi ena APD photodetector

Chiyembekezo chambiri

APD yatsopanoyi ili ndi zofunikira pa machitidwe a liDAR ndi mapulogalamu a photon:

1. Chiŵerengero chapamwamba cha phokoso ndi phokoso: Kupindula kwakukulu ndi kutsika kwa phokoso kumapangitsa kuti phokoso likhale lopanda phokoso, lomwe ndi lofunika kwambiri kuti ligwiritsidwe ntchito m'madera osauka a photon, monga kuwunika kwa mpweya wowonjezera kutentha.

2. Kugwirizana kwamphamvu: APD photodetector yatsopano (avalanche photodetector) yapangidwa kuti ikhale yogwirizana ndi nsanja zamakono za indium phosphide (InP) optoelectronics, kuonetsetsa kusakanikirana kosasunthika ndi machitidwe oyankhulana amalonda omwe alipo.

3. Kuchita bwino kwambiri: Imatha kugwira ntchito bwino kutentha kwa chipinda popanda njira zoziziritsira zovuta, kupangitsa kuti ntchito ikhale yosavuta kugwiritsa ntchito zosiyanasiyana.

Kupanga kwatsopano kwa 1550 nm SACM APD photodetector (avalanche photodetector) kumayimira kupambana kwakukulu m'munda, Kuyika malire okhudzana ndi phokoso lambiri komanso kupeza zinthu za bandwidth mu mapangidwe achikhalidwe a APD photodetector (avalanche photodetector). Zatsopanozi zikuyembekezeka kupititsa patsogolo luso la machitidwe a liDAR, makamaka m'makina osayendetsedwa a liDAR, komanso kulumikizana kwaulere.