Ib qho tshiab ntawm Ultrashort Laser Pulse Technology

Lasers tau dhau los ua ib feem tseem ceeb ntawm cov khoom siv suav tsis txheeb thiab kev lag luam. Thaum lub laser beam cuam tshuam nrog rau saum npoo ntawm cov khoom siv nanoscale, nws emits ib nthwv dej ntawm lub teeb hu ua "plasmon" (plasma exciton), thiab cov khoom ntawm plasma exciton tuaj yeem xa cov ntaub ntawv. Hauv kev xa khoom kho qhov muag, lub laser twj tso kua mis lub teeb rau hauv cov khoom hu ua "saturable absorber" los tsim cov teeb liab optical.
Tsis ntev los no, Yu Yao, tus kws tshaj lij ntawm hluav taws xob engineering ntawm Arizona State University, thiab nws pab neeg tshawb fawb ntawm Arizona State's Center for Photonics Innovation tau tsim kom muaj zog dua, muaj zog ntau dua nanoscale laser keeb hu ua graphene-plasma hybrid meta-structured saturable absorber, los yog GPSMA.
GPSMA muaj peev xwm siv tau hauv kev lag luam xws li kev sib txuas lus, kev ua ntaub ntawv, spectroscopy thiab biomedicine. Lub absorber tuaj yeem siv los txhim kho kev ceev, kev ua tau zoo, thiab kev ua haujlwm tag nrho los ua kom cov ntaub ntawv xa mus, kev ua ntaub ntawv, biomedical sensing, thiab imaging technologies.
Vim tias nws cov khoom muaj txiaj ntsig zoo hauv kev kho qhov muag thiab kev nqus dej txaus, Yu Yao pab pawg tau koom nrog kev tsim kho hlau-graphene hybrid hauv lawv txoj kev loj hlob.
Nyob rau hauv ib daim ntawv tsis ntev los no luam tawm nyob rau hauv lub scientific journal ACS Nano, Yao piav qhia txog yuav ua li cas nws lub chaw soj nstuam integrated graphene-raws li saturable absorber thiab yuav ua li cas lawv tswj los txhim kho lub cuab yeej kom txo tau hwj chim noj thaum tswj ultra-ceev teb lub sij hawm.
Lawv tau txais cov txiaj ntsig tseem ceeb no los ntawm kev tsim cov kav hlau txais xov kho qhov muag uas tsom lub teeb mus rau nanoscale qhov khoob hauv cov khoom, hu ua kub qhov chaw, los txhawb kev nqus. Los ntawm kev tsom mus rau lub laser ntawm cov chaw kub no, lawv tau pom tias muaj kev ua tau zoo dua qub thiab txo kev siv zog.
"Graphene yog lub teeb yuag thiab muaj lub sijhawm teb kho qhov muag ceev, tab sis kev nqus qis hauv nws daim ntawv monolayer," said Yu Yao, "Peb tsim cov cuab yeej kom lub teeb nqus ntawm nanoscale hotspots tuaj yeem nce ntau dua peb qhov kev txiav txim ntawm qhov loj, ua tsis tau xwb. Nrog GPSMA, peb tab tom ua ib lub tshuab nqus dej uas muaj peev xwm txo tau lub zog siv ze li ntawm ob mus rau peb qhov kev txiav txim loj. "
Raws li nws qhov nrawm nrawm, lawv cov thev naus laus zis tshiab yuav qhib lub sijhawm tshiab rau infrared laser spectroscopy thiab high-speed optical teeb liab kev sib txuas lus (fiber optic cable thiab satellite kev sib txuas lus).
"Peb lub cuab yeej tuaj yeem ua haujlwm ntawm cov ntaub ntawv ceev ceev," Yu Yao hais tias, "Cov pa nqus nqus nqus tuaj yeem ua haujlwm ntawm lub sijhawm nanosecond, tab sis tam sim no peb tuaj yeem ncav cuag li 60 femtoseconds, ntau dua 100, 000 zaug sai dua ua ntej. "
GPSMA tam sim no ua haujlwm nyob ze-infrared wavelengths ntawm electromagnetic spectrum. Vim tias graphene muaj cov lus teb dav dav, nws tuaj yeem txuas ntxiv nws cov kev pab cuam spectral mus ntev wavelengths hauv cheeb tsam infrared spectral, uas muaj qhov cuam tshuam tseem ceeb rau molecular spectroscopy thiab kev sib txuas lus kho qhov muag. Txawm li cas los xij, rau qhov ntev wavelengths, nws yog ib txwm nyuaj dua kom ua tiav saturable absorption thiab tsim ultrashort laser pulses. Yog li ntawd, lub tswv yim tsim GPSMA tuaj yeem ua tiav qhov sib txawv ntawm kev siv tshuab.
Yu Yao pab pawg cov cuab yeej muaj peev xwm siv tau hauv kev sib txuas lus, lub zog thiab biomedical industries. Xws li absorbers tuaj yeem siv los txhim kho kev ceev, kev ua tau zoo thiab tag nrho kev ua tau zoo ntawm fiber ntau optic cables, qhib lub sijhawm rau kev nce qib kev xa cov ntaub ntawv, kev ua haujlwm hnub ci ntawm tes thiab cov kab mob kuaj pom cov thev naus laus zis.