IYunivesithi yasePeking yaqaphela i-perovskite eqhubekayoumthombo we-laserencane kune-1 square micron
Kubalulekile ukwakha umthombo we-laser oqhubekayo onendawo yedivayisi engaphansi kuka-1μm2 ukuze kuhlangatshezwane nesidingo sokusetshenziswa kwamandla aphansi sokuxhumeka kwe-optical on-chip (<10 fJ bit-1). Kodwa-ke, njengoba usayizi wedivayisi uncipha, ukulahlekelwa kwe-optical kanye nezinto ezibonakalayo kuyanda kakhulu, ngakho-ke ukufeza usayizi wedivayisi ye-sub-micron kanye nokupompa okuqhubekayo kwemithombo ye-laser kuyinselele kakhulu. Eminyakeni yamuva nje, izinto ze-halide perovskite zithole ukunakwa okukhulu emkhakheni wama-laser aqhutshwa yi-optical ngenxa yokwanda kwawo okuphezulu kwe-optical kanye nezakhiwo ezihlukile ze-exciton polariton. Indawo yedivayisi yemithombo ye-laser eqhubekayo ye-perovskite ebikiwe kuze kube manje isengaphezu kuka-10μm2, futhi imithombo ye-laser ye-submicron yonke idinga ukukhanya kwe-pulsed okunamandla aphezulu e-pump ukuze kukhuthazwe.
Ukuphendula le nselele, iqembu locwaningo likaZhang Qing waseSikoleni Sesayensi Yezinto Nobunjiniyela basePeking University lilungiselele ngempumelelo izinto zekristalu eyodwa ze-perovskite submicron ezisezingeni eliphezulu ukuze kufezwe imithombo ye-laser yokupompa eqhubekayo enendawo yedivayisi ephansi njenge-0.65μm2. Ngesikhathi esifanayo, i-photon yembulwa. Indlela yokusebenza kwe-exciton polariton enqubweni ye-lasing eqhutshwa yi-submicron eqhutshwa yi-optical iqondwa ngokujulile, okunikeza umbono omusha wokuthuthukiswa kwama-laser amancane e-semiconductor aphansi. Imiphumela yocwaningo, enesihloko esithi “Ama-Laser e-Perovskite aqhutshwa yi-Continuous Wave Pumped aneNdawo Yedivayisi Engaphansi kwe-1 μm2,” isanda kushicilelwa ku-Advanced Materials.
Kulo msebenzi, ishidi le-micron le-perovskite CsPbBr3 elilodwa le-inorganic lalungiswa ku-substrate ye-sapphire ngokufakwa kwe-chemical vapor. Kwabonwa ukuthi ukuhlangana okunamandla kwama-exciton e-perovskite nama-photon odonga lomsindo we-microcavity ekushiseni kwegumbi kwaholela ekwakhekeni kwe-excitonic polariton. Ngochungechunge lobufakazi, njengokuqina kokukhishwa okuqondile kuya kokungaqondile, ububanzi bomugqa omncane, ukuguqulwa kwe-polarization yokukhishwa kanye nokuguqulwa kokuhambisana kwendawo emkhawulweni, i-fluorescence lase eqhubekayo epompelwe nge-optically ye-CsPbBr3 eyodwa ye-sub-micron-sized crystal iyaqinisekiswa, futhi indawo yedivayisi iphansi njenge-0.65μm2. Ngesikhathi esifanayo, kwatholakala ukuthi umkhawulo womthombo we-laser we-submicron ufana nowomthombo we-laser omkhulu, futhi ungaba phansi kakhulu (Isithombe 1).
Umfanekiso 1. I-submicron eqhutshwa ngokubonakalayo i-CsPbBr3umthombo wokukhanya we-laser
Ngaphezu kwalokho, lo msebenzi uhlola kokubili ngokuhlola nangokwasengqondweni, futhi wembula indlela ama-exciton ahlanganiswe ngayo i-exciton ekuqalisweni kwemithombo ye-laser eqhubekayo ye-submicron. Ukuhlanganiswa kwe-photon-exciton okuthuthukisiwe kuma-perovskites e-submicron kuphumela ekukhuleni okukhulu kwe-group refractive index kuya cishe ku-80, okwandisa kakhulu inzuzo yemodi ukuze kulungiswe ukulahleka kwemodi. Lokhu kuphinde kuphumele emthonjeni we-laser we-perovskite submicron onesici sekhwalithi ye-microcavity esisebenza kahle kakhulu kanye nobubanzi bokukhishwa obuncane (Isithombe 2). Le ndlela iphinde inikeze ukuqonda okusha ngokuthuthukiswa kwama-laser amancane, aphansi asekelwe kwezinye izinto ze-semiconductor.
Umfanekiso 2. Indlela yomthombo we-laser we-sub-micron usebenzisa ama-excitonic polarizons
USong Jiepeng, umfundi weZhibo ka-2020 ovela eSikoleni Sesayensi Yezinto Eziphathekayo Nobunjiniyela basePeking University, ungumbhali wokuqala waleli phepha, kanti iPeking University iyiyunithi yokuqala yaleli phepha. UZhang Qing noXiong Qihua, uprofesa weFiziksi eTsinghua University, bangababhali abahambisanayo. Lo msebenzi usekelwe yiNational Natural Science Foundation of China kanye neBeijing Science Foundation for Outstanding Young People.
Isikhathi sokuthunyelwe: Septhemba 12-2023