IYunivesithi yasePeking yafumanisa ukuba i-perovskite iyaqhubekaumthombo welezaincinci kune-1 square micron
Kubalulekile ukwakha umthombo welaser oqhubekayo onommandla wesixhobo ongaphantsi kwe-1μm2 ukuhlangabezana neemfuno eziphantsi zokusetyenziswa kwamandla oqhagamshelwano lwe-on-chip optical (<10 fJ bit-1). Nangona kunjalo, njengoko ubungakanani besixhobo buncipha, ukulahleka kwe-optical kunye nezinto ezibonakalayo kuyanda kakhulu, ngoko ke ukufikelela kubungakanani besixhobo se-sub-micron kunye nokupompa kwe-optical okuqhubekayo kwemithombo yelaser kunzima kakhulu. Kwiminyaka yakutshanje, izixhobo ze-halide perovskite zifumene ingqwalasela enkulu kwicandelo le-continuous optical pumped lasers ngenxa yokufumana kwazo okuphezulu kwe-optical kunye neempawu ezizodwa ze-exciton polariton. Indawo yesixhobo se-perovskite continuous laser sources ezixeliweyo ukuza kuthi ga ngoku isengaphezulu kwe-10μm2, kwaye imithombo ye-submicron laser yonke ifuna ukukhanya kwe-pulsed okunobuninzi bamandla epompo ukuze ivuseleleke.
Ukuphendula lo mngeni, iqela lophando likaZhang Qing kwiSikolo seSayensi yezinto zokwakha kunye noBunjineli kwiYunivesithi yasePeking lilungiselele ngempumelelo izixhobo zekristale ze-perovskite submicron ezikumgangatho ophezulu ukuze kufezekiswe imithombo yelaser yokupompa eqhubekayo kunye nommandla wesixhobo ophantsi njenge-0.65μm2. Kwangaxeshanye, i-photon iyatyhilwa. Indlela yokusebenza kwe-exciton polariton kwinkqubo ye-lasing eqhubekayo ye-submicron epompelwe ngokubonakalayo iqondwa ngokunzulu, nto leyo enika ingcamango entsha yophuhliso lwee-laser ze-semiconductor ezincinci ezinomlinganiselo ophantsi. Iziphumo zolu phononongo, ezinesihloko esithi “IiLaser zePerovskite eziPompelwe ngamaza eziQhubekayo ezineNdawo yeSixhobo engaphantsi kwe-1 μm2,” zipapashwe kutshanje kwi-Advanced Materials.
Kulo msebenzi, iphepha le-inorganic perovskite CsPbBr3 single crystal micron lalungiswa kwi-sapphire substrate ngokubeka umphunga wekhemikhali. Kwabonwa ukuba ukudibana okunamandla kwee-excitons ze-perovskite kunye nee-photons zodonga lwesandi se-microcavity kubushushu begumbi kwaphumela ekwakhiweni kwe-excitonic polariton. Ngoluhlu lobungqina, olufana nobunzulu bokukhupha obungqalileyo ukuya kobungqalileyo, ububanzi bomgca omxinwa, ukuguqulwa kwe-emission polarization kunye nokuguqulwa kokuhambelana kwendawo emngciphekweni, i-continuous optically pumped fluorescence lase ye-sub-micron-size CsPbBr3 single crystal iyaqinisekiswa, kwaye indawo yesixhobo iphantsi njenge-0.65μm2. Kwangaxeshanye, kwafunyaniswa ukuba umda womthombo we-submicron laser uyafana nowomthombo we-laser omkhulu, kwaye unokuba ngaphantsi (Umfanekiso 1).
Umfanekiso 1. I-submicron ephonswa ngokubonakalayo i-CsPbBr3umthombo wokukhanya nge-laser
Ngaphezu koko, lo msebenzi uhlola zombini ngokweenzame kunye nethiyori, kwaye utyhila indlela yokusebenza kwee-excitons ezi-exciton-polarized ekufezekiseni imithombo ye-laser eqhubekayo ye-submicron. Ukuhlanganiswa kwe-photon-exciton okuphuculweyo kwi-submicron perovskites kubangela ukwanda okukhulu kwi-group refractive index ukuya malunga ne-80, nto leyo eyandisa kakhulu i-mode gain ukuhlawula ilahleko ye-mode. Oku kukwabangela umthombo we-laser ye-perovskite submicron ene-microcavity quality factor ephezulu kunye ne-emission linewidth encinci (Umfanekiso 2). Le ndlela ikwabonelela ngengqiqo entsha malunga nophuhliso lwee-laser ezincinci, ezisezantsi ezisekelwe kwezinye izixhobo ze-semiconductor.
Umfanekiso 2. Indlela yomthombo welaser ye-sub-micron usebenzisa ii-excitonic polarizons
USong Jiepeng, umfundi waseZhibo ka-2020 ovela kwiSikolo seSayensi yeZixhobo kunye noBunjineli kwiYunivesithi yasePeking, ngumbhali wokuqala wephepha, kwaye iYunivesithi yasePeking yiyunithi yokuqala yephepha. UZhang Qing kunye noXiong Qihua, uprofesa weFiziksi kwiYunivesithi yaseTsinghua, ngababhali abahambelanayo. Lo msebenzi uxhaswe yiNational Natural Science Foundation yaseTshayina kunye neBeijing Science Foundation for Outstanding Young People.
Ixesha lokuthumela: Septemba-12-2023