Ua ʻike ʻo Peking University i kahi kumu laser mau perovskite ʻoi aku ka liʻiliʻi ma mua o 1 micron square

Ua ʻike ʻo Peking University i kahi perovskite maupuna laserliʻiliʻi ma mua o 1 micron square
He mea nui e kūkulu i kahi kumu laser hoʻomau me kahi wahi mea ma lalo o 1μm2 no ka hoʻokō ʻana i ka pono haʻahaʻa haʻahaʻa o ka hoʻohana ʻana i ka ikehu ma-chip (<10 fJ bit-1). Eia nō naʻe, i ka emi ʻana o ka nui o ka hāmeʻa, piʻi nui nā poho o ka optical a me nā waiwai, no laila paʻakikī loa ka hoʻokō ʻana i ka nui sub-micron device a me ka hoʻomau ʻana i ka ʻōpua o nā kumu laser. I nā makahiki i hala iho nei, ua loaʻa i nā mea halide perovskite ka nānā nui ʻana i ke kahua o nā lasers optically pumped mau ma muli o ko lākou kiʻekiʻe optical loaʻa a me nā waiwai exciton polariton. ʻOi aku ka nui o ka ʻāpana o nā kumu laser mau perovskite i kēia manawa ma mua o 10μm2, a pono nā kumu laser submicron āpau i nā kukui pulsed me ka nui o ka ikehu pauma kiʻekiʻe e hoʻoulu ai.

I ka pane ʻana i kēia pilikia, ua hoʻomākaukau maikaʻi ka hui noiʻi o Zhang Qing mai ke Kula o nā Materials Science a me ka ʻenekinia o ke Kulanui o Peking i ke kūlana kiʻekiʻe o ka perovskite submicron hoʻokahi mau mea aniani no ka hoʻokō ʻana i nā kumu laser pumping optical me kahi wahi mea haʻahaʻa e like me 0.65μm2. I ka manawa like, hōʻike ʻia ka photon. ʻO ke ʻano o ka exciton polariton i loko o ka submicron hoʻomau optically pumped lasing kaʻina i hoʻomaopopo hohonu ʻia, e hāʻawi ana i kahi manaʻo hou no ka hoʻomohala ʻana i nā lasers semiconductor paepae haʻahaʻa liʻiliʻi. ʻO nā hopena o ke aʻo ʻana, i kapa ʻia ʻo "Continuous Wave Pumped Perovskite Lasers with Device Area Below 1 μm2," ua paʻi hou ʻia ma Advanced Materials.

Ma kēia hana, ua hoʻomākaukau ʻia ka perovskite CsPbBr3 pepa micron aniani hoʻokahi ma luna o ka substrate sapphire e ka waiho ʻana o ka mahu. Ua ʻike ʻia ʻo ka hoʻohui ikaika ʻana o nā excitons perovskite me nā kiʻi microcavity wall leo i ka lumi wela ka hopena i ka hoʻokumu ʻana o ka polariton excitonic. Ma o nā hōʻike hōʻike, e like me ka laina laina a hiki i ka ikaika ʻole, ka laulā laina haiki, ka hoʻololi ʻana o ka polarization emission a me ka hoʻololi ʻana o ka spatial coherence ma ka paepae, ua hoʻopaʻa ʻia ka lase fluorescence hoʻomau o ka sub-micron-sized CsPbBr3 hoʻokahi kristal, a ua hōʻoia ʻia ka wahi o ka mea hana. he 0.65μm2 ka haʻahaʻa. I ka manawa like, ua ʻike ʻia ua like ka paepae o ke kumu laser submicron me ka punawai laser nui, a hiki ke emi iho (Figure 1).

Kiʻi 1. Submicron CsPbBr3 hoʻomau ʻia me ka hoʻoheheʻe ʻiapuna kukui laser

Eia kekahi, ke ʻimi nei kēia hana i ka hoʻokolohua a me ka theoretically, a hōʻike i ke ʻano o nā exciton-polarized excitons i ka hoʻokō ʻana i nā kumu laser mau submicron. ʻO ka hoʻohui ʻana o ka photon-exciton i hoʻonui ʻia i nā submicron perovskites ka hopena i ka piʻi nui ʻana o ka pūʻulu refractive index ma kahi o 80, kahi e hoʻonui nui ai i ka loaʻa ʻana o ke ʻano e uku ai i ka nalowale o ke ʻano. ʻO kēia ka hopena i kahi kumu laser submicron perovskite me kahi kumu maikaʻi microcavity maikaʻi aʻe a me ka linewidth hoʻokuʻu haiki (Figure 2). Hāʻawi pū ka mīkini i nā ʻike hou i ka hoʻomohala ʻana i nā lasers liʻiliʻi, haʻahaʻa haʻahaʻa e pili ana i nā mea semiconductor ʻē aʻe.

Kiʻi 2. Mechanism o sub-micron laser kumu hoʻohana excitonic polarizons

ʻO Song Jiepeng, he haumāna Zhibo 2020 mai ke Kula ʻo Material Science a me Engineering o ke Kulanui o Peking, ʻo ia ka mea kākau mua o ka pepa, a ʻo ke Kulanui ʻo Peking ka ʻāpana mua o ka pepa. ʻO Zhang Qing lāua ʻo Xiong Qihua, ke kaukaʻi o Physics ma ke Kulanui ʻo Tsinghua, nā mea kākau pili. Ua kākoʻo ʻia ka hana e ka National Natural Science Foundation o Kina a me ka Beijing Science Foundation for Outstanding Young People.