Peking University tau ua tiav perovskite txuas ntxiv musqhov chaw laserme dua 1 square micron
Nws yog ib qho tseem ceeb uas yuav tsum tsim kom muaj qhov chaw laser txuas ntxiv mus nrog thaj chaw cuab yeej tsawg dua 1μm2 kom tau raws li qhov xav tau kev siv hluav taws xob tsawg ntawm kev sib txuas ntawm lub chip optical (<10 fJ bit-1). Txawm li cas los xij, thaum qhov loj ntawm lub cuab yeej txo qis, kev poob ntawm qhov muag thiab cov khoom siv nce ntxiv ntau heev, yog li ua tiav qhov loj ntawm lub cuab yeej sub-micron thiab kev nqus cov khoom siv laser txuas ntxiv mus yog qhov nyuaj heev. Nyob rau hauv xyoo tas los no, cov ntaub ntawv halide perovskite tau txais kev saib xyuas ntau hauv thaj chaw ntawm cov lasers txuas ntxiv mus vim lawv qhov nce siab ntawm qhov muag thiab cov khoom tshwj xeeb exciton polariton. Thaj chaw cuab yeej ntawm perovskite txuas ntxiv mus laser qhov chaw tau tshaj tawm txog tam sim no tseem loj dua 10μm2, thiab cov khoom siv laser submicron txhua tus xav tau lub teeb pulsed nrog lub zog siab dua los txhawb.
Ua teb rau qhov kev sib tw no, pawg neeg tshawb fawb ntawm Zhang Qing los ntawm Tsev Kawm Ntawv ntawm Cov Khoom Siv Science thiab Engineering ntawm Peking University tau ua tiav npaj cov khoom siv perovskite submicron ib leeg siv lead ua ke kom ua tiav cov khoom siv laser twj tso kua mis txuas ntxiv nrog thaj chaw khoom siv qis li 0.65μm2. Tib lub sijhawm, photon tau qhia tawm. Lub tshuab ntawm exciton polariton hauv submicron txuas ntxiv optically pumped lasing txheej txheem tau nkag siab tob, uas muab lub tswv yim tshiab rau kev txhim kho cov me me qis threshold semiconductor lasers. Cov txiaj ntsig ntawm kev tshawb fawb, hu ua "Continuous Wave Pumped Perovskite Lasers nrog thaj chaw khoom siv hauv qab 1 μm2," tau luam tawm tsis ntev los no hauv Advanced Materials.
Hauv txoj haujlwm no, daim ntawv inorganic perovskite CsPbBr3 ib leeg siv lead ua micron tau npaj rau ntawm sapphire substrate los ntawm kev tso pa tshuaj lom neeg. Nws tau pom tias qhov kev sib txuas ntawm perovskite excitons nrog lub suab phab ntsa microcavity photons ntawm chav tsev kub ua rau muaj kev tsim ntawm excitonic polariton. Los ntawm ntau cov pov thawj, xws li linear mus rau nonlinear emission intensity, narrow line width, emission polarization transformation thiab spatial coherence transformation ntawm threshold, qhov txuas ntxiv optically pumped fluorescence lase ntawm sub-micron-sized CsPbBr3 ib leeg siv lead ua tau lees paub, thiab thaj chaw ntaus ntawv yog qis li 0.65μm2. Tib lub sijhawm, nws tau pom tias qhov threshold ntawm submicron laser qhov chaw yog sib piv rau qhov ntawm qhov loj-loj laser qhov chaw, thiab tuaj yeem qis dua (Daim Duab 1).
Daim Duab 1. Cov khoom siv submicron uas raug pumped tas mus li CsPbBr3lub teeb laser
Ntxiv mus, txoj haujlwm no tshawb nrhiav ob qho tib si experimentally thiab theoretically, thiab qhia txog lub mechanism ntawm exciton-polarized excitons hauv kev paub txog submicron continuous laser sources. Kev txhim kho photon-exciton coupling hauv submicron perovskites ua rau muaj kev nce ntxiv hauv pawg refractive index mus txog 80, uas ua rau hom nce ntxiv kom them rau hom poob. Qhov no kuj ua rau muaj perovskite submicron laser source nrog cov microcavity zoo dua thiab cov emission linewidth nqaim dua (Daim Duab 2). Lub mechanism kuj muab cov kev nkag siab tshiab rau hauv kev txhim kho cov me me, qis-threshold lasers raws li lwm cov ntaub ntawv semiconductor.
Daim Duab 2. Lub tshuab ua haujlwm ntawm qhov chaw laser sub-micron siv cov polarizons excitonic
Song Jiepeng, ib tug tub ntxhais kawm Zhibo xyoo 2020 los ntawm Tsev Kawm Ntawv ntawm Cov Khoom Siv thiab Kev Tsim Kho ntawm Peking University, yog thawj tus sau ntawm daim ntawv, thiab Peking University yog thawj chav tsev ntawm daim ntawv. Zhang Qing thiab Xiong Qihua, xib fwb ntawm Physics ntawm Tsinghua University, yog cov kws sau ntawv sib raug. Cov haujlwm tau txais kev txhawb nqa los ntawm National Natural Science Foundation ntawm Tuam Tshoj thiab Beijing Science Foundation rau Cov Tub Ntxhais Hluas Zoo Tshaj Plaws.
Lub sijhawm tshaj tawm: Cuaj hlis-12-2023