Ci gaban da aka samu kwanan nan a cikin na'urorin gano ambaliyar ruwa masu saurin kamuwa da zaftarewar ƙasa

Ci gaban da aka samu kwanan nan a cikinmasu gano ambaliyar ruwa masu yawan hankali

Babban ƙarfin zafin jiki na ɗaki 1550 nmna'urar gano kwararar ruwan sama (avalanche photodiode integrator)

A cikin ƙungiyar infrared (SWIR), ana amfani da diodes masu saurin gaske masu ƙarfi a cikin sadarwa ta optoelectronic da aikace-aikacen liDAR. Duk da haka, photodiode na yanzu mai kusa da infrared avalanche (APD) wanda diode mai rushewar avalanche na Indium gallium arsenic (InGaAs APD) ya mamaye koyaushe ana iyakance shi ta hanyar hayaniyar ionization na bazuwar kayan yanki mai yawa na gargajiya, indium phosphide (InP) da indium aluminum arsenic (InAlAs), wanda ke haifar da raguwa mai yawa a cikin ƙarfin na'urar. Tsawon shekaru, masu bincike da yawa suna neman sabbin kayan semiconductor waɗanda suka dace da tsarin dandamali na InGaAs da InP optoelectronic kuma suna da aikin hayaniyar ionization mai ƙarancin tasiri kamar kayan silicon mai yawa.

Injin gano hasken walƙiya mai ƙarfin 1550 nm yana taimakawa wajen haɓaka tsarin LiDAR.

Wata ƙungiyar masu bincike a Burtaniya da Amurka ta yi nasarar ƙirƙiro wani sabon na'urar gano ƙwayoyin cuta mai ƙarfin gaske mai ƙarfin 1550 nm APD photodetector a karon farko.na'urar gano ambaliyar ruwa), wani ci gaba wanda ke alƙawarin inganta aikin tsarin LiDAR da sauran aikace-aikacen optoelectronic sosai.

Sabbin kayan aiki suna ba da fa'idodi masu mahimmanci

Babban abin da ya fi daukar hankali a wannan binciken shi ne amfani da kayan aiki na zamani. Masu binciken sun zabi GaAsSb a matsayin layin sha da AlGaAsSb a matsayin layin ninkawa. Wannan tsari ya bambanta da na gargajiya na InGaAs/InP kuma yana kawo fa'idodi masu yawa:

1. Layin sha na GaAsSb: GaAsSb yana da irin wannan ma'aunin sha na InGaAs, kuma sauyawa daga layin sha na GaAsSb zuwa AlGaAsSb (layin ninkawa) ya fi sauƙi, yana rage tasirin tarko da inganta saurin da ingancin sha na'urar.

2. Layin ninkawa na AlGaAsSb: Layin ninkawa na AlGaAsSb ya fi na gargajiya na InP da InAlAs yawa a cikin aiki. Yawanci yana bayyana a cikin babban riba a zafin ɗaki, babban bandwidth da kuma ƙarar hayaniya mai yawa.

Tare da kyakkyawan alamun aiki

Sabonna'urar gano hoto ta APD(mai gano kwararar hoto) yana kuma bayar da ci gaba mai mahimmanci a cikin ma'aunin aiki:

1. Ribar da ta yi yawa sosai: An samu ribar da ta yi yawa sosai ta 278 a zafin ɗaki, kuma kwanan nan Dr. Jin Xiao ya inganta inganta tsarin da tsarin, kuma an ƙara yawan ribar zuwa M=1212.

2. Ƙarancin hayaniya sosai: yana nuna ƙarancin hayaniya mai yawa (F < 3, gain M = 70; F<4, gain M = 100).

3. Ingantaccen ƙarfin kwantum: a ƙarƙashin mafi girman riba, ingancin kwantum yana da girma har zuwa 5935.3%. Ƙarfin kwanciyar hankali na zafin jiki: ƙarfin amsawar lalacewa a ƙananan zafin jiki shine kusan 11.83 mV/K.

Hoto na 1: Yawan hayaniyar APDna'urorin gano hotoidan aka kwatanta da sauran na'urar gano hoto ta APD

Faɗin damar aikace-aikace

Wannan sabuwar APD tana da muhimman tasiri ga tsarin liDAR da aikace-aikacen photon:

1. Ingantaccen rabon sigina zuwa hayaniya: Babban ƙaruwa da ƙarancin hayaniyar yana inganta rabon sigina zuwa hayaniya sosai, wanda yake da mahimmanci ga aikace-aikace a cikin muhallin da ba su da kyau na photon, kamar sa ido kan iskar gas mai dumama yanayi.

2. Ƙarfin jituwa: An tsara sabon na'urar gano hoto ta APD (mai gano avalanche photodetector) don ta dace da dandamalin optoelectronics na indium phosphide (InP) na yanzu, wanda ke tabbatar da haɗin kai mai kyau da tsarin sadarwa na kasuwanci da ake da su.

3. Ingantaccen aiki: Yana iya aiki yadda ya kamata a zafin ɗaki ba tare da tsauraran hanyoyin sanyaya ba, yana sauƙaƙa amfani da shi a aikace-aikace daban-daban na aiki.

Ci gaban wannan sabon na'urar gano hoto ta SACM APD mai karfin 1550 nm (mai gano hoto ta avalanche) yana wakiltar babban ci gaba a fagen, Yana magance manyan ƙuntatawa da ke da alaƙa da hayaniya mai yawa da kuma samun samfuran bandwidth a cikin ƙirar na'urar gano hoto ta APD ta gargajiya (mai gano hoto ta avalanche). Ana sa ran wannan ƙirƙira zai haɓaka ƙarfin tsarin liDAR, musamman a cikin tsarin liDAR mara matuƙi, da kuma sadarwa ta sararin samaniya kyauta.