Peking University idazindikira gwero lopitilira laser la perovskite lochepera 1 lalikulu micron

Peking University anazindikira perovskite mosalekezagwero la laseryaying'ono kuposa 1 lalikulu micron
Ndikofunikira kupanga gwero la laser mosalekeza ndi malo a chipangizo osakwana 1μm2 kuti akwaniritse zofunikira zochepa zogwiritsa ntchito mphamvu za on-chip optical interconnection (<10 fJ bit-1). Komabe, kukula kwa chipangizochi kumachepa, kuwonongeka kwa kuwala ndi zinthu kumawonjezeka kwambiri, kotero kuti kukwaniritsa kukula kwa chipangizo cha micron ndi kupopera kosalekeza kwa magwero a laser kumakhala kovuta kwambiri. M'zaka zaposachedwa, zida za halide perovskite zakhala zikuyang'aniridwa kwambiri m'munda wa ma laser opopedwa mosalekeza chifukwa cha kupindula kwawo kwakukulu komanso mawonekedwe apadera a exciton polariton. Malo a chipangizo cha perovskite magwero opitilira laser omwe adanenedwa mpaka pano akadali okulirapo kuposa 10μm2, ndipo magwero a laser submicron onse amafunikira kuwala kwapampu ndi kachulukidwe kamphamvu kapampu kuti alimbikitse.

Poyankha vutoli, gulu lofufuza la Zhang Qing kuchokera ku School of Materials Science ndi Engineering ku yunivesite ya Peking linakonzekera bwino zipangizo zamakono za perovskite submicron single crystal kuti akwaniritse magwero a laser optical pumping mosalekeza ndi malo a chipangizo otsika ngati 0.65μm2. Pa nthawi yomweyi, photon imawululidwa. Makina a exciton polariton mu submicron mosalekeza optically pumped lasing process amamveka bwino, omwe amapereka lingaliro latsopano pakupanga ma laser ang'onoang'ono otsika polowera semiconductor. Zotsatira za phunziroli, lotchedwa "Continuous Wave Pumped Perovskite Lasers with Device Area Pansi pa 1 μm2," posachedwapa adasindikizidwa mu Advanced Materials.

Mu ntchito iyi, inorganic perovskite CsPbBr3 single crystal micron pepala linakonzedwa pa safiro gawo lapansi ndi kuyika kwa mankhwala nthunzi. Zinawoneka kuti kugwirizana kolimba kwa perovskite excitons ndi phokoso khoma microcavity photons pa firiji inachititsa mapangidwe excitonic polariton. Kupyolera mu mndandanda wa maumboni, monga liniya kuti nonlinear umuna kwambiri, yopapatiza mzere m'lifupi, mpweya polarization kusintha ndi malo mgwirizano kusintha polowera, mosalekeza amapopedwa fluorescence laser wa sub-micron-kakulidwe CsPbBr3 kristalo watsimikiziridwa, ndi chipangizo dera ndi otsika ngati 0.65μm2. Panthawi imodzimodziyo, zinapezeka kuti pakhomo la gwero la laser submicron likufanana ndi gwero lalikulu la laser, ndipo likhoza kukhala lotsika (Chithunzi 1).

Chithunzi 1. Kupitilira optically pumped submicron CsPbBr3gwero la kuwala kwa laser

Kuphatikiza apo, ntchitoyi imayang'ana moyesera komanso mwaukadaulo, ndikuwulula momwe ma exciton-polarized excitons amathandizira pakukwaniritsidwa kwa ma submicron opitilira laser magwero. Kuphatikizidwa kwa photon-exciton mu submicron perovskites kumabweretsa kuwonjezeka kwakukulu kwa gulu la refractive index kufika pafupifupi 80, zomwe zimawonjezera phindu la mode kuti lipereke malipiro a kutayika. Izi zimabweretsanso gwero la laser la perovskite submicron lomwe lili ndi mphamvu yapamwamba kwambiri ya microcavity komanso kutulutsa kocheperako (Chithunzi 2). Makinawa amaperekanso zidziwitso zatsopano pakupanga ma laser ang'onoang'ono, otsika pang'ono potengera zida zina za semiconductor.

Chithunzi 2. Njira ya sub-micron laser source pogwiritsa ntchito excitonic polarizons

Song Jiepeng, wophunzira wa Zhibo wa 2020 wochokera ku School of Materials Science and Engineering ku Peking University, ndiye mlembi woyamba wa pepalali, ndipo Peking University ndiye gawo loyamba la pepalali. Zhang Qing ndi Xiong Qihua, pulofesa wa Physics pa yunivesite ya Tsinghua, ndi olemba ofanana. Ntchitoyi inathandizidwa ndi National Natural Science Foundation ya China ndi Beijing Science Foundation for Outstanding Young People.