I-Peking University yaqaphela i-perovskite eqhubekayoumthombo we-laserencane kune-micron yesikwele esingu-1
Kubalulekile ukwakha umthombo we-laser oqhubekayo ngendawo yedivayisi engaphansi kuka-1μm2 ukuze uhlangabezane nemfuneko yokusetshenziswa kwamandla okuphansi kokuxhunywa kwe-on-chip optical (<10 fJ bit-1). Kodwa-ke, njengoba usayizi wedivayisi uncipha, ukulahlekelwa kokubona nokokusebenza kukhuphuka kakhulu, ngakho-ke ukuzuza usayizi wedivayisi ye-sub-micron kanye nokumpompa okubonakalayo okuqhubekayo kwemithombo ye-laser kuyinselele kakhulu. Eminyakeni yamuva, izinto zokwakha ze-halide perovskite zithole ukunakwa okubanzi emkhakheni we-lasers optically pumped eqhubekayo ngenxa yokuzuza kwabo okuphezulu kwe-optical kanye nezakhiwo eziyingqayizivele ze-exciton polariton. Indawo yedivayisi yemithombo yelaser eqhubekayo ye-perovskite ebikwe kuze kube manje isenkulu kuno-10μm2, futhi imithombo ye-laser submicron yonke idinga ukukhanya okushaywayo okunomfutho wephampu ophezulu ukuze ishukumise.
Ekuphenduleni le nselelo, iqembu locwaningo lika-Zhang Qing elivela eSikoleni Sesayensi Yezinto Zokusebenza Nobunjiniyela sase-Peking University lilungiselele ngempumelelo izinto zokwakha zekristalu eyodwa ye-perovskite submicron eyodwa ukuze kuzuzwe imithombo ye-laser yokupompa eqhubekayo enendawo yedivayisi ephansi njenge-0.65μm2. Ngesikhathi esifanayo, i-photon yembulwa. Indlela ye-exciton polariton ku-submicron eqhubekayo ye-optically pumped lasing process iqondwa ngokujulile, ehlinzeka ngombono omusha wokuthuthukiswa kwama-laser aphansi we-threshold semiconductor lasers. Imiphumela yocwaningo, enesihloko esithi "Ama-Lasers aqhubekayo e-Wave Pumped Perovskite aneNdawo Yedivayisi Ngaphansi kwe-1 μm2," isanda kushicilelwa ku-Advanced Materials.
Kulo msebenzi, i-inorganic perovskite CsPbBr3 ishidi le-crystal micron eyodwa lalungiswa ku-substrate yesafire ngokufakwa komhwamuko wamakhemikhali. Kwaphawulwa ukuthi ukuhlangana okuqinile kwe-perovskite excitons ne-photons odongeni lwe-microcavity omsindo ekamelweni lokushisa kubangele ukwakheka kwe-excitonic polariton. Ngochungechunge lobufakazi, njengokuqina kokukhipha okuqondile kuya kokungaqondile, ububanzi bomugqa omncane, ukuguqulwa kwe-polarization kanye noguquko lokuhambisana kwendawo embundwini, i-lase ye-fluorescence eqhubekayo yokupompa ye-sub-micron-size CsPbBr3 single crystal iyaqinisekiswa, kanye nendawo yedivayisi. iphansi njenge-0.65μm2. Ngesikhathi esifanayo, kwatholakala ukuthi umkhawulo womthombo we-laser we-submicron uqhathaniswa nalowo womthombo we-laser wosayizi omkhulu, futhi ungaba ngaphansi (Umfanekiso 1).
Umfanekiso 1. I-submicron e-optically pumped eqhubekayo CsPbBr3umthombo wokukhanya we-laser
Ngaphezu kwalokho, lo msebenzi uhlola kokubili ngokuhlola nangokwethiyori, futhi wembula indlela yama-exciton-polarized excitons ekugcwalisekeni kwemithombo ye-laser eqhubekayo ye-submicron. Ukuhlangana okuthuthukisiwe kwe-photon-exciton ku-submicron perovskites kuphumela ekwenyukeni okukhulu kwenkomba ye-refractive yeqembu iye cishe ku-80, okwandisa kakhulu inzuzo yemodi ukuze kunxeshezelwe ukulahlekelwa kwemodi. Lokhu kuphinde kuphumele emthonjeni we-laser we-perovskite submicron onesici esiphezulu sekhwalithi ye-microcavity ephumelelayo kanye nobubanzi obuncane bokuphuma komugqa (Umfanekiso 2). Lo mshini futhi uhlinzeka ngemininingwane emisha ekuthuthukisweni kwama-lasers anosayizi omncane, ane-low-threshold asekelwe kwezinye izinto ze-semiconductor.
Umfanekiso 2. Indlela yomthombo we-laser sub-micron usebenzisa i-excitonic polarizons
USong Jiepeng, umfundi wase-Zhibo wango-2020 waseSikoleni Sesayensi Yezinto Zokusebenza kanye Nobunjiniyela basePeking University, ungumbhali wokuqala wephepha, kanti i-Peking University iyiyunithi yokuqala yephepha. UZhang Qing kanye no-Xiong Qihua, uprofesa we-Physics eNyuvesi yaseTsinghua, bangababhali abahambisanayo. Lo msebenzi usekelwe yiNational Natural Science Foundation yaseChina kanye neBeijing Science Foundation Yentsha Evelele.
Isikhathi sokuthumela: Sep-12-2023