IYunivesithi yasePeking yaqaphela i-perovskite eqhubekayoumthombo laserincinci kune-1 square micron
Kubalulekile ukwakha umthombo welaser oqhubekayo kunye nommandla wesixhobo ongaphantsi kwe-1μm2 ukuhlangabezana neemfuno zokusetyenziswa kwamandla aphantsi kwe-on-chip optical interconnection (<10 fJ bit-1).Nangona kunjalo, njengoko ubungakanani besixhobo buncipha, ilahleko yamehlo kunye nemathiriyeli yonyuka kakhulu, ke ngoko ukufikelela kwisixhobo esincinci semicron kunye nokumpompa okubonakalayo kwemithombo yelaser kulucelomngeni kakhulu.Kwiminyaka yakutshanje, izinto ze-halide perovskite ziye zafumana ingqwalasela ebanzi kwintsimi ye-laser ye-optically pumped eqhubekayo ngenxa yokuzuza kwabo okuphezulu kunye neempawu ezizodwa ze-exciton polariton.Indawo yesixhobo se-perovskite yemithombo ye-laser eqhubekayo echazwe ngoku isekho ngaphezu kwe-10μm2, kunye nemithombo ye-laser submicron yonke ifuna ukukhanya kwe-pulsed kunye noxinano lwamandla ompompo oluphezulu ukuvuselela.
Ekuphenduleni lo mngeni, iqela lophando likaZhang Qing ukusuka kwiSikolo seSayensi yezeNzululwazi kunye nobuNjineli beYunivesithi yasePeking lilungiselele ngempumelelo i-perovskite submicron enye yezinto eziphathekayo ze-crystal ukufezekisa imithombo ye-laser yokupompa eqhubekayo kunye nommandla wesixhobo esisezantsi njenge-0.65μm2.Ngexesha elifanayo, i-photon ibonakaliswe.Indlela ye-exciton polariton kwi-submicron eqhubekayo ye-optically pumped lasing process iqondwa nzulu, ebonelela ngombono omtsha wophuhliso lobungakanani obuncinci be-laser semiconductor lasers.Iziphumo zophando, ezinesihloko esithi "I-Wave eqhubekayo iPumped Perovskite Lasers kunye nommandla weDivaysi ngaphantsi kwe-1 μm2," isanda kupapashwa kwizinto eziPhambili.
Kulo msebenzi, i-perovskite ye-inorganic perovskite CsPbBr3 eyodwa ye-crystal micron sheet yalungiswa kwi-sapphire substrate nge-chemical vapor deposition.Kwaphawulwa ukuba ukudibanisa okunamandla kwe-perovskite excitons kunye nodonga oluvakalayo lwe-microcavity photons kwiqondo lokushisa lokushisa kubangele ukubunjwa kwe-polarion ye-excitonic.Ngokusebenzisa uthotho lobungqina, obufana nomgca ukuya kobunzulu bokukhutshwa kwe-nonlinear, ububanzi bomgca omxinwa, inguqu ye-polarization ephumayo kunye nokuguqulwa kokuhambelana kwendawo kwinqanaba, i-optically pumped fluorescence laser ye-sub-micron-ubungakanani bekristale enye ye-CsPbBr3 iqinisekisiwe, kunye nendawo yesixhobo. iphantsi njenge-0.65μm2.Ngelo xesha, kwafunyaniswa ukuba umda womthombo we-laser we-submicron uthelekiseka kumthombo we-laser enkulu, kwaye unokuba ngaphantsi (Umfanekiso 1).
Umzobo 1. I-CsPbBr3 eqhubekayo ye-optically pumped submicronumthombo wokukhanya we-laser
Ngaphaya koko, lo msebenzi uphonononga zombini ngokulinga kunye nethiyori, kwaye utyhila indlela ye-exciton-polarized excitons ekufezekisweni kwemithombo ye-laser engapheliyo.Ukuhlanganiswa kwe-photon-exciton ephuculweyo kwi-submicron perovskites kubangela ukunyuka okukhulu kwi-index ye-refractive yeqela ukuya malunga ne-80, eyandisa kakhulu inzuzo yemowudi yokuhlawula ilahleko yemodi.Oku kuphinda kubangele umthombo we-laser we-perovskite submicron kunye neyona nto iphezulu yekhwalithi ye-microcavity kunye ne-emission linewidth encinci (Umfanekiso 2).Indlela yokusebenza ikwabonelela ngemibono emitsha ekuphuhliseni ubungakanani obuncinci, iilaser ezisezantsi ezisekwe kwezinye izinto zesemiconductor.
Umzobo 2. Inkqubo ye-sub-micron laser source usebenzisa i-excitonic polarizons
U-Song Jiepeng, umfundi we-2020 we-Zhibo ovela kwiSikolo seNzululwazi yezeNzululwazi kunye nobuNjineli beYunivesithi yasePeking, ungumbhali wokuqala wephepha, kunye neYunivesithi yasePeking yiyunithi yokuqala yephepha.UZhang Qing kunye no-Xionng Qihua, uprofesa weFiziksi kwiYunivesithi yaseTsinghua, ngababhali abahambelanayo.Lo msebenzi wawuxhaswa yiNational Natural Science Foundation yaseTshayina kunye neBeijing Science Foundation for Outstanding Young People.
Ixesha lokuposa: Sep-12-2023