Tshiab ib hom semiconductor laser tsim: Simultaneous siab zog thiab loj scaling
Cov kws tshawb fawb ntawm University of California, Berkeley (UC Berkeley) tsis ntev los no tau tsim ib hom tshiab semiconductor laser hu ua BerkSEL. Cov txiaj ntsig tau luam tawm hauv phau ntawv Journal Nature thaum Lub Rau Hli 29.
Schematic ntawm Berkley Surface Emission Laser (BerkSEL), nrog lub twj tso kua mis beam xiav thiab laser beam liab.
Ib txhij nce qhov loj thiab lub zog ntawm ib hom lasers tau ua ib qho kev sib tw hauv optics txij li thawj lub laser tau tsim hauv xyoo 1960. Thiab qhov kev ua haujlwm no qhia tau hais tias qhov loj me tsis tas yuav los ntawm tus nqi sib koom ua ke, uas tso cai rau cov lasers muaj zog dua. thiab ruaj khov thiab npog ntev dua nyob rau hauv ntau daim ntawv thov.
Pab pawg ntawm cov kws tshawb fawb coj los ntawm Boubacar Kanté, tus kws tshaj lij hauv Department of Electrical Engineering thiab Computer Science (EECS) ntawm University of California, Berkeley, thiab cov kws tshawb fawb hauv Cov Khoom Siv Tshawb Fawb ntawm Lawrence Berkeley National Laboratory tau ua kom pom cov yeeb yaj kiab semiconductor zoo ib yam. spaced thiab zoo tib yam qhov loj me perforations uas tuaj yeem ua raws li cov kab noj hniav scalable. Cov txiaj ntsig tau pom tias lub laser beam emits ib lub wavelength zoo ib yam tsis hais qhov loj ntawm lub laser kab noj hniav.
Nyob rau hauv cov pa lasers, coherent ib leeg-wavelength directional lub teeb pib tawg thaum lub laser kab noj hniav loj hlob tuaj. Cov txheej txheem kev daws teeb meem yog siv cov txheej txheem sab nraud zoo li lub waveguide los ua kom nrov ntawm cov nqaj, txawm li cas los xij, qhov no siv ntau qhov chaw. Los ntawm kev tshem tawm qhov kev xav tau rau kev nthuav dav sab nraud, cov kws tshawb fawb tam sim no tuaj yeem txo qhov loj me thiab ua kom muaj txiaj ntsig zoo ntawm cov tshuab computer chips thiab lwm yam laser-dependent Cheebtsam.
Qhov kev ua haujlwm no tshwj xeeb yog cuam tshuam rau ntsug kab noj hniav nto emitting laser (VCSEL) tshuab. Hauv VCSELS, lub teeb yog emission vertically los ntawm sab saum toj ntawm lub nti. VCSELs feem ntau tsuas yog ob peb microns dav, thiab cov tswv yim tam sim no siv los txhim kho lawv lub hwj chim yog los pab pawg ntau pua tus neeg VCSELs ua ke. Vim tias cov lasers muaj kev ywj pheej, lawv muaj ntau theem thiab wavelengths, yog li lawv lub hwj chim tsis sib koom ua ke - uas yog siv tau rau hauv cov ntawv thov xws li kev paub lub ntsej muag, tab sis tsis tuaj yeem ua tiav hauv cov ntawv thov qhov tseeb yog qhov tseem ceeb, xws li kev sib txuas lus lossis kev phais.
Lub "BerkSEL" laser tsim tsim ntawm UC Berkeley ua kom muaj txiaj ntsig zoo dua ib hom teeb pom kev zoo, raws li cov khoom siv lub cev ntawm lub teeb dhau los ntawm qhov hauv cov yeeb yaj kiab nyias. Cov zaj duab xis lawv tsim yog ib tug 200-nm-thick indium gallium arsenide phosphide (ib tug semiconductor feem ntau siv nyob rau hauv fiber optics thiab telecommunications technology). Cov kws tshawb fawb tau sau tseg tias cov qhov tsis tu ncua no tau etched los ntawm photolithography thiab yuav tsum muaj qhov loj me, cov duab thiab nyob deb - lawv muaj peev xwm ua tau raws li Dirac cov ntsiab lus, cov ntsiab lus topological ntawm ob-seem cov ntaub ntawv raws li linear dispersion ntawm lub zog.
Tsis tas li ntawd, txij li cov theem ntawm lub teeb propagating los ntawm ib qho taw tes mus rau lwm qhov yog sib npaug rau qhov refractive index multiplied los ntawm qhov kev ncua deb mus. Txij li thaum lub refractive index yog xoom ntawm lub Dirac point, lub teeb emitted los ntawm ntau qhov chaw ntawm lub semiconductor yog nyob rau hauv raws nraim tib theem thiab yog li optically zoo tib yam. Walid Redjem, tus thawj coj ntawm txoj kev tshawb no thiab ib tus kws kho mob EECS, tau hais tias, "Cov yeeb yaj kiab hauv peb txoj kev kawm muaj txog 3, 000 qhov, tab sis txoj kev xav, nws tuaj yeem muaj ib lab lossis ib lab qhov thiab qhov tshwm sim. yuav zoo ib yam. "
Cov kws tshawb fawb tam sim no siv lub tshuab hluav taws xob siab lub zog los kho qhov muag pom thiab lub zog ntawm BerkSEL cov cuab yeej thiab ntsuas qhov emission ntawm txhua qhov aperture siv lub tshuab ntsuas confocal optimized rau ze-infrared spectroscopy. Los ntawm kev kho cov qauv tsim xws li aperture loj thiab cov khoom siv semiconductor, "BerkSELs" semiconductor lasers tuaj yeem tawm ntawm lub hom phiaj sib txawv.
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