Yunivesite ya Peking inapeza gwero la laser lopitirira la perovskite laling'ono kuposa maikuloni imodzi lalikulu

Yunivesite ya Peking yapeza perovskite yopitiliragwero la laserkakang'ono kuposa maikuloni imodzi lalikulu
Ndikofunikira kupanga gwero la laser lopitilira ndi malo a chipangizo osakwana 1μm2 kuti likwaniritse zosowa zochepa za on-chip optical interconnection (<10 fJ bit-1). Komabe, pamene kukula kwa chipangizocho kukuchepa, kutayika kwa optical ndi zinthu kumawonjezeka kwambiri, kotero kukwaniritsa kukula kwa chipangizo cha sub-micron ndi kupopera kosalekeza kwa magwero a laser ndizovuta kwambiri. M'zaka zaposachedwa, zipangizo za halide perovskite zalandira chidwi chachikulu m'munda wa ma laser opitilira optical chifukwa cha kuchuluka kwawo kwakukulu kwa optical ndi mawonekedwe apadera a exciton polariton. Dera la chipangizo cha magwero a laser opitilira a perovskite omwe anenedwa mpaka pano akadali okulirapo kuposa 10μm2, ndipo magwero a laser a submicron onse amafunikira kuwala koyendetsedwa ndi mphamvu yayikulu ya pampu kuti alimbikitse.

Poyankha vutoli, gulu lofufuza la Zhang Qing kuchokera ku Sukulu ya Sayansi ya Zipangizo ndi Uinjiniya ku Yunivesite ya Peking linakonza bwino zinthu zapamwamba za perovskite submicron single crystal kuti zikwaniritse magwero a laser opitilira kupopera ndi malo a chipangizo otsika ngati 0.65μm2. Nthawi yomweyo, photon yawululidwa. Kapangidwe ka exciton polariton mu submicron continuous optically pumped lasing process kamveka bwino, zomwe zimapereka lingaliro latsopano pakupanga ma lasers ang'onoang'ono otsika threshold semiconductor. Zotsatira za kafukufukuyu, zomwe zimatchedwa "Continuous Wave Pumped Perovskite Lasers with Device Area Below 1 μm2," zasindikizidwa posachedwapa mu Advanced Materials.

Mu ntchito iyi, pepala la micron la perovskite CsPbBr3 lopangidwa ndi zinthu zopanda organic linakonzedwa pa substrate ya safiro pogwiritsa ntchito nthunzi ya mankhwala. Zinaonedwa kuti kulumikizana kwamphamvu kwa ma exciton a perovskite ndi ma photon a microcavity a khoma la mawu kutentha kwa chipinda kunapangitsa kuti pakhale polariton yodabwitsa. Kudzera mu umboni wosiyanasiyana, monga mphamvu ya emission yolunjika mpaka yosakhala yolunjika, m'lifupi mwa mzere wopapatiza, kusintha kwa emission polarization ndi kusintha kwa mgwirizano wa malo pamalo otsetsereka, fluorescence lase yopitilira yopompedwa ndi kuwala ya kristalo imodzi ya CsPbBr3 yocheperako imatsimikiziridwa, ndipo dera la chipangizocho ndi lotsika ngati 0.65μm2. Nthawi yomweyo, zinapezeka kuti malire a gwero la laser la submicron ndi ofanana ndi a gwero lalikulu la laser, ndipo akhoza kukhala otsika (Chithunzi 1).

Chithunzi 1. Submicron yopopera mosalekeza CsPbBr3gwero la kuwala kwa laser

Kuphatikiza apo, ntchitoyi ikuyang'ana mozama komanso mwa chiphunzitso, ndipo ikuwonetsa momwe ma excitons a exciton-polarized amagwirira ntchito pozindikira magwero a laser opitilira a submicron. Kuphatikiza kwa photon-exciton komwe kumakulitsidwa mu submicron perovskites kumapangitsa kuti chiwerengero cha refractive index chiwonjezeke kwambiri kufika pafupifupi 80, zomwe zimapangitsa kuti pakhale kuchuluka kwa mode kuti zithandizire kutayika kwa mode. Izi zimapangitsanso kuti gwero la perovskite submicron laser likhale ndi microcavity quality factor yothandiza kwambiri komanso mzere wocheperako wotulutsa (Chithunzi 2). Njirayi imaperekanso chidziwitso chatsopano pakupanga ma lasers ang'onoang'ono, otsika kwambiri kutengera zida zina za semiconductor.

Chithunzi 2. Njira yogwiritsira ntchito gwero la laser la sub-micron pogwiritsa ntchito excitonic polarizons

Song Jiepeng, wophunzira wa Zhibo wa 2020 wochokera ku Sukulu ya Sayansi ndi Uinjiniya wa Peking University, ndiye wolemba woyamba wa pepalali, ndipo Peking University ndiye gawo loyamba la pepalali. Zhang Qing ndi Xiong Qihua, pulofesa wa Fizikisi ku Tsinghua University, ndi olemba omwe akugwirizana nawo. Ntchitoyi idathandizidwa ndi National Natural Science Foundation of China ndi Beijing Science Foundation for Outstanding Young People.