Tsis ntev los no, Lub Xeev Lub Chaw Haujlwm Tseem Ceeb ntawm Kev Ntsuas-Field Laser Physics ntawm Shanghai Institute of Optics thiab Precision Machinery (SIPM) ntawm Suav Academy ntawm Kev Tshawb Fawb (CAS) tau ua tiav hauv kev kawm ntawm ultrafast photocontrol ntawm graphene los tsim cov seem tam sim no. Cov txiaj ntsig kev tshawb fawb cuam tshuam tau luam tawm hauv Optics, nyob rau hauv lub npe ntawm "Residual tam sim no nyob rau hauv kev sib xyaw ua ke ntawm cov hnab ntawv nqa khoom theem thiab chirp: theem hloov thiab nce siab". Cov txiaj ntsig tau tshaj tawm hauv Optics Express.
Optical teb-driven tam sim no nrog lub peev xwm rau high-ceev teeb liab ua yog ib qho tseem ceeb ntawm txoj kev loj hlob nyob rau hauv lightwave electronics. Ntau cov ntaub ntawv tau siv rau kev tshawb fawb txog, ntawm cov graphene yog qhov tshwj xeeb rau nws txoj kev tiv thaiv tsis muaj zog, kev puas tsuaj loj, thiab kev thauj mus los siab. Kev nkag siab tob tob thiab kev tswj xyuas meej ntawm cov neeg nqa khoom thauj hauv graphene yog lub hauv paus tseem ceeb rau kev txhim kho cov khoom siv hluav taws xob ultrafast optoelectronic ntawm qib ntaus-hertz. Los ntawm tib lub sijhawm sib txawv ntawm lub hnab ntawv nqa khoom theem (CEP, φ) thiab linear chirp tus nqi ( ) ntawm linearly polarized tsav lub teeb teb, cov kws tshawb fawb pom tias qhov kev hloov pauv ntawm cov seem tam sim no nthuav tawm theem hloov pauv thiab nce siab (Daim duab 1), thiab tias cov theem hloov pauv tuaj yeem pom los ntawm kev tawm tsam sib txawv chirp degrees.
Kev nce qib hauv kev tswj hwm ntawm photocurrent tiam los ntawm irradiating graphene nrog ob peb lub voj voog femtosecond laser ntawm SIPO
Daim duab 1 Residual tam sim no densities nyob rau hauv kev sib xyaw ua ke ntawm CEP thiab chirp, A, B thiab C sib haum mus rau qhov siab tshaj plaws residual tam sim no ntom ntawm qhov sib txawv chirp tus nqi
Los ntawm kev sib piv cov seem tam sim no sib xyaw ua ke los ntawm lub zog kx raws lub laser polarization kev taw qhia nyob rau hauv peb kis ntawm A, B, thiab C, nws pom tias qhov kev txhim kho feem ntau tshwm sim nyob ze ntawm ob lub ntsiab zoo (Fig. 2c), thiab ob qho tib si. cov ntsiab lus ntawm P1, thiab P2 raug xaiv rau kev tsom xam (Fig. 2b). Raws li cov txheeb ze band coupling muaj zog thiab cov evolution ntawm lub electron fabrication nyob rau hauv lub conduction band nrog lub sij hawm (Fig. 3), nws pom tau hais tias nrog kev nce ntawm tus chirp tus nqi, lub electron motion hloov ntawm Landau-Zener-Stückelberg cuam tshuam. dominance mus rau lub multiphoton cuam tshuam dominance, piv txwv li, kev sib cuam tshuam ntawm lub teeb nrog graphene yog maj hloov los ntawm non-perturbative rau perturbative. hloov mus rau hom perturbative. Yog li, cov txiaj ntsig ntawm kev sib koom ua ke tuaj yeem pab nrhiav qhov tsim nyog los kawm txog kev tswj hwm kev hloov pauv hauv lub xeev thiab hluav taws xob hluav taws xob. Qhov kev tshawb fawb no pab txhawb rau kev txhim kho cov teeb liab ua ntawm optical frequencies thiab optoelectronic integrated device applications.
Kev nce qib hauv kev tswj hwm ntawm cov cim photocurrent los ntawm graphene irradiated los ntawm ob peb lub voj voog femtosecond laser ntawm SIPM
Fig. 2 (a) thiab (b) Kev ua cov khoom siv band rau cov neeg mob B thiab C, (c) Cov khoom seem tam sim no sib xyaw ua ke los ntawm lub zog kx raws li laser polarization kev taw qhia.
Kev vam meej nyob rau hauv kev tswj hwm ntawm photocurrent tiam nyob rau hauv graphene irradiated los ntawm ib tug femtosecond laser nrog tsawg cycles ntawm SIPM.
Fig. 3 (ac) Evolution ntawm tus txheeb ze band coupling zog (t) thiab cov electron fabrication ρ(t) nyob rau hauv lub conduction band ntawm P1 nrog rau lub sij hawm nyob rau hauv cov ntaub ntawv ntawm A, B, thiab C, (d) Schematic ntawm multiphoton cuam tshuam
