Taw qhia, photon suav homlinear avalanche photodetector
Photon suav thev naus laus zis tuaj yeem ua kom pom cov teeb liab photon kom kov yeej lub suab nrov ntawm cov khoom siv hluav taws xob, thiab sau cov naj npawb ntawm photons tso tawm los ntawm tus ntes nyob rau qee lub sijhawm los ntawm kev siv cov yam ntxwv ntawm lub cev tsis sib xws ntawm lub ntsuas hluav taws xob tso tawm hluav taws xob hauv qab lub teeb tsis muaj zog irradiation. , thiab xam cov ntaub ntawv ntawm lub hom phiaj ntsuas raws li tus nqi ntawm photon meter. Txhawm rau kom paub txog lub teeb pom kev tsis muaj zog, ntau yam sib txawv ntawm cov twj paj nruag uas muaj peev xwm tshawb pom photon tau raug kawm hauv ntau lub tebchaws. Ib lub xeev avalanche photodiode (APD photodetector) yog ib qho khoom siv uas siv cov nyhuv photoelectric sab hauv los kuaj pom lub teeb liab. Piv nrog rau lub tshuab nqus tsev, cov khoom siv hauv lub xeev muaj qhov zoo tshaj plaws hauv cov lus teb ceev, suav tsaus, kev siv hluav taws xob, ntim thiab sib nqus rhiab heev, thiab lwm yam. Cov kws tshawb fawb tau ua cov kev tshawb fawb raws li cov khoom siv hauv lub xeev APD photon suav cov duab thev naus laus zis.
APD photodetector ntaus ntawvmuaj Geiger hom (GM) thiab linear hom (LM) ob hom kev ua haujlwm, tam sim no APD photon suav cov duab thev naus laus zis feem ntau siv Geiger hom APD ntaus ntawv. Geiger hom APD cov cuab yeej muaj qhov rhiab heev ntawm theem ntawm ib qho photon thiab cov lus teb siab ceev ntawm kaum tawm nanoseconds kom tau txais lub sijhawm raug siab. Txawm li cas los xij, Geiger hom APD muaj qee qhov teeb meem xws li kuaj lub sijhawm tuag, tsis tshua pom kev ua haujlwm zoo, cov lus sib dhos loj loj thiab qhov kev daws teeb meem tsis zoo, yog li nws nyuaj rau kev txhim kho qhov tsis sib xws ntawm qhov ntsuas siab thiab qis qis qis. Photon txee raws li nyob ze-noiseless high-gain HgCdTe APD cov khoom siv ua haujlwm hauv hom kab, tsis muaj lub sijhawm tuag thiab kev txwv kev sib tham, tsis muaj kev cuam tshuam nrog Geiger hom, tsis tas yuav quench circuits, muaj ultra-high dynamic ntau yam, dav. thiab tunable spectral teb ntau yam, thiab tuaj yeem ua rau nws tus kheej ua kom zoo rau kev tshawb nrhiav kev ua haujlwm thiab suav tus lej cuav. Nws qhib ib daim ntawv thov tshiab ntawm infrared photon suav cov duab, yog ib qho tseem ceeb ntawm txoj kev loj hlob ntawm photon suav cov cuab yeej, thiab muaj daim ntawv thov dav dav hauv kev soj ntsuam astronomical, kev sib txuas lus hauv qhov chaw dawb, active thiab passive imaging, fringe nrhiav thiab lwm yam.
Lub hauv paus ntsiab lus ntawm photon suav hauv HgCdTe APD li
APD photodetector pab kiag li lawm raws li HgCdTe cov ntaub ntawv tuaj yeem npog ntau lub wavelengths, thiab ionization coefficients ntawm electrons thiab qhov sib txawv heev (saib daim duab 1 (a)). Lawv nthuav tawm ib qho kev sib koom ua ke ntawm ib qho kev sib koom ua ke hauv qhov kev txiav tawm wavelength ntawm 1.3 ~ 11 µm. Yuav luag tsis muaj suab nrov ntau dhau (piv nrog lub suab nrov tshaj FSi ~ 2-3 ntawm Si APD cov khoom siv thiab FIII-V ~ 4-5 ntawm III-V tsev neeg cov khoom siv (saib daim duab 1 (b)), kom lub teeb liab- cov suab nrov piv ntawm cov cuab yeej yuav luag tsis poob nrog qhov nce ntawm qhov nce, uas yog qhov zoo tshaj plaws infraredLub avalanche photodetector.
FIG. 1 (a) Kev sib raug zoo ntawm qhov cuam tshuam ionization coefficient piv ntawm mercury cadmium telluride cov khoom thiab cov khoom siv x ntawm Cd; (b) Kev sib piv ntawm cov suab nrov tshaj F ntawm APD cov khoom siv nrog cov khoom siv sib txawv
Photon suav tshuab yog cov thev naus laus zis tshiab uas tuaj yeem digitally rho tawm cov teeb liab kho qhov muag los ntawm cov suab nrov thermal los ntawm kev daws teeb meem photoelectron pulses tsim los ntawmphotodetectortom qab tau txais ib qho photon. Txij li thaum lub teeb pom kev tsis tshua muaj kev sib cais ntau dua nyob rau hauv lub sij hawm sau, cov hluav taws xob teeb liab tso tawm los ntawm lub detector kuj yog ntuj thiab discrete. Raws li tus yam ntxwv ntawm lub teeb tsis muaj zog, pulse amplification, pulse discrimination thiab digital suav cov tswv yim feem ntau yog siv los kuaj pom lub teeb tsis muaj zog. Niaj hnub nimno photon suav tshuab muaj ntau yam zoo, xws li cov teeb liab-rau-suab nrov piv, muaj kev ntxub ntxaug, siab ntsuas qhov tseeb, zoo tiv thaiv drift, zoo lub sij hawm stability, thiab muaj peev xwm tso tawm cov ntaub ntawv mus rau lub computer nyob rau hauv daim ntawv ntawm cov teeb liab rau kev soj ntsuam tom ntej. thiab kev ua, uas yog unmatched los ntawm lwm txoj kev nrhiav kom tau. Tam sim no, lub tshuab suav photon tau siv dav hauv kev ntsuas kev lag luam thiab ntsuas lub teeb qis, xws li nonlinear optics, molecular biology, ultra-high resolution spectroscopy, astronomical photometry, atmospheric pollution ntsuas, thiab lwm yam. mus rau qhov tau txais thiab nrhiav pom cov teeb liab tsis muaj zog. Lub mercury cadmium telluride avalanche photodetector yuav luag tsis muaj suab nrov, raws li qhov nce ntxiv, lub teeb liab-rau-suab nrov piv tsis lwj, thiab tsis muaj sij hawm tuag thiab kev txwv kev cuam tshuam nrog Geiger avalanche, uas yog qhov tsim nyog rau daim ntawv thov nyob rau hauv photon suav, thiab yog ib qho tseem ceeb ntawm txoj kev loj hlob ntawm photon suav cov cuab yeej yav tom ntej.
Post lub sij hawm: Jan-14-2025