Jami'ar Peking ta gano tushen laser mai ci gaba da perovskite wanda ya fi ƙasa da murabba'in micron 1.

Jami'ar Peking ta gano ci gaba na perovskitetushen laserƙasa da murabba'in micron 1
Yana da mahimmanci a gina tushen laser mai ci gaba tare da yankin na'ura ƙasa da 1μm2 don biyan buƙatun ƙarancin amfani da makamashi na haɗin kai na gani akan guntu (<10 fJ bit-1). Duk da haka, yayin da girman na'urar ke raguwa, asarar gani da kayan abu yana ƙaruwa sosai, don haka cimma girman na'urar sub-micron da ci gaba da famfo na tushen laser yana da matuƙar ƙalubale. A cikin 'yan shekarun nan, kayan halide perovskite sun sami kulawa sosai a fannin lasers masu ci gaba da famfo saboda yawan ribarsu da kuma kaddarorin exciton polariton na musamman. Yankin na'urar tushen laser mai ci gaba da perovskite da aka ruwaito zuwa yanzu har yanzu ya fi 10μm2, kuma tushen laser submicron duk suna buƙatar hasken pulsed tare da yawan kuzarin famfo don motsawa.

Don mayar da martani ga wannan ƙalubalen, ƙungiyar bincike ta Zhang Qing daga Makarantar Kimiyya da Injiniya ta Jami'ar Peking ta yi nasarar shirya kayan lu'ulu'u guda ɗaya na perovskite submicron masu inganci don cimma ci gaba da tushen laser na famfo mai gani tare da yankin na'ura mai ƙarancin 0.65μm2. A lokaci guda, an bayyana photon. An fahimci yadda ake amfani da exciton polariton a cikin tsarin lasing mai cike da ruwa mai cike da ruwa mai zurfi, wanda ke ba da sabuwar ra'ayi don haɓaka ƙananan lasers na semiconductor masu ƙarancin ƙofa. Sakamakon binciken, mai taken "Laser Perovskite mai cike da ruwa mai zurfi tare da Yankin Na'ura ƙasa da 1 μm2," kwanan nan an buga shi a cikin Advanced Materials.

A cikin wannan aikin, an shirya takardar micron guda ɗaya ta perovskite CsPbBr3 a kan sapphire substrate ta hanyar adana tururin sinadarai. An lura cewa haɗakar excitons na perovskite tare da photons na bangon sauti a zafin ɗaki ya haifar da samuwar excitonic polariton. Ta hanyar jerin shaidu, kamar ƙarfin fitar da iska mai layi zuwa mara layi, faɗin layi mai kunkuntar, canjin polarization na fitarwa da canjin haɗin kai a wurin aiki, an tabbatar da ci gaba da hasken haske na lu'ulu'u guda ɗaya na CsPbBr3 mai girman ƙananan micron, kuma yankin na'urar yana ƙasa da 0.65μm2. A lokaci guda, an gano cewa ƙofar tushen laser submicron tana kama da ta babban tushen laser, kuma tana iya zama ƙasa (Hoto na 1).

Hoto na 1. Submicron mai ci gaba da famfo ta hanyar gani CsPbBr3tushen hasken laser

Bugu da ƙari, wannan aikin yana bincika duka ta hanyar gwaji da kuma ta ka'ida, kuma yana bayyana hanyar excitons masu rarrafe na excitons wajen aiwatar da tushen laser mai ci gaba na submicron. Haɗakar photon-exciton a cikin submicron perovskites yana haifar da ƙaruwa mai yawa a cikin ma'aunin refractive na rukuni zuwa kusan 80, wanda ke ƙara yawan yanayin don rama asarar yanayin. Wannan kuma yana haifar da tushen laser submicron perovskite tare da ingantaccen ingancin microcavity da kuma faɗin layin fitarwa mai kunkuntar (Hoto na 2). Tsarin kuma yana ba da sabbin fahimta game da haɓaka ƙananan lasers masu girman girma, ƙananan ƙofa bisa ga wasu kayan semiconductor.

Hoto na 2. Tsarin tushen laser na sub-micron ta amfani da excitonic polarizons

Song Jiepeng, ɗalibi a makarantar Zhibo ta shekarar 2020 daga Makarantar Kimiyya da Injiniya ta Jami'ar Peking, shi ne marubucin farko na wannan takarda, kuma Jami'ar Peking ita ce sashe na farko na wannan takarda. Zhang Qing da Xiong Qihua, farfesa a fannin kimiyyar lissafi a Jami'ar Tsinghua, su ne marubutan da suka dace. Gidauniyar Kimiyyar Halitta ta Ƙasa ta China da Gidauniyar Kimiyya ta Beijing don Matasa Masu Kyau sun tallafa wa wannan aikin.