Yunivhesiti yePeking yakawana perovskite inoenderera mberisosi yelaserkadiki pane imwe sikweya maikironi
Zvakakosha kugadzira sosi yelaser inoenderera mberi ine nzvimbo yemudziyo iri pasi pe1μm2 kuti isangane nezvinodiwa zvishoma zve on-chip optical interconnection (<10 fJ bit-1). Zvisinei, sezvo saizi yemudziyo ichiderera, kurasikirwa kwe optical nezvinhu kunowedzera zvakanyanya, saka kuwana saizi yemudziyo we sub-micron uye kupomba kwe optical kunoenderera mberi kwe laser sources kwakaoma zvikuru. Mumakore achangopfuura, zvinhu zve halide perovskite zvave kutariswa zvakanyanya mumunda we continuous optical pumped lasers nekuda kwe high optical gain yavo uye hunhu hwakasiyana hwe exciton polariton. Nzvimbo yemudziyo ye perovskite continuous laser sources yakataurwa kusvika pari zvino ichiri yakakura kupfuura 10μm2, uye submicron laser sources dzese dzinoda pulsed light ine simba rakawanda repombi kuti ikurudzire.
Mukupindura dambudziko iri, boka rekutsvagisa raZhang Qing kubva kuChikoro cheSainzi yeZvinhu neUinjiniya chePeking University rakabudirira kugadzira zvinhu zveperovskite submicron single crystal zvemhando yepamusoro kuti zviwane manyuko elaser anopomba optical ane nzvimbo yemudziyo yakaderera se0.65μm2. Panguva imwe chete, photon inoonekwa. Maitiro eexciton polariton mu submicron anopomba optical optically anonzwisiswa zvakadzama, izvo zvinopa pfungwa itsva yekuvandudzwa kwemalaser e small size low threshold semiconductor. Mhedzisiro yechidzidzo ichi, ine musoro unoti "Continuous Wave Pumped Perovskite Lasers ane Nzvimbo yeMudziyo Pasi pe1 μm2," yakaburitswa munguva pfupi yapfuura muAdvanced Materials.
Mubasa iri, pepa re micron re inorganic perovskite CsPbBr3 rakagadzirwa pamusoro pe substrate yesapphire ne chemical vapor deposition. Zvakaonekwa kuti kubatana kwakasimba kwe perovskite excitons nema sound wall microcavity photons patembiricha yemumba kwakaguma nekuumbwa kwe excitonic polariton. Kuburikidza nezviratidzo zvakawanda, zvakaita se linear to nonlinear emission intensity, narrow line width, emission polarization transformation uye spatial coherence transformation pa threshold, continuous optically pumped fluorescence lase ye sub-micron-sized CsPbBr3 single crystal yakasimbiswa, uye nzvimbo yemudziyo yakaderera se 0.65μm2. Panguva imwe chete, zvakaonekwa kuti threshold ye submicron laser source yakafanana neye laser source yakakura, uye inogona kutove yakaderera (Mufananidzo 1).
Mufananidzo 1. Submicron inopombwa nemaziso inoenderera mberi CsPbBr3chiedza chelaser
Uyezve, basa iri rinoongorora zvese mukuyedza uye dzidziso, uye rinoburitsa mashandiro eexciton-polarized excitons mukuita ma submicron continuous laser sources. Kubatanidzwa kwephoton-exciton kwakawedzerwa mu submicron perovskites kunoita kuti pave nekuwedzera kukuru kwegroup refractive index kusvika pa80, izvo zvinowedzera zvakanyanya mode gain kuti zvidzore kurasikirwa kwemode. Izvi zvinogumawo ne perovskite submicron laser source ine microcavity quality factor yepamusoro inoshanda uye diki emission linewidth (Mufananidzo 2). Iyi mechanism inopawo ruzivo rutsva mukuvandudzwa kwema small-size, low-threshold lasers zvichibva pane zvimwe zvinhu zve semiconductor.
Mufananidzo 2. Maitiro ekushandisa sub-micron laser source uchishandisa excitonic polarizons
Song Jiepeng, mudzidzi weZhibo wegore ra2020 kubva kuSchool of Materials Science and Engineering yePeking University, ndiye munyori wekutanga wepepa iri, uye Peking University ndiyo chikamu chekutanga chepepa iri. Zhang Qing naXiong Qihua, purofesa weFizikisi paTsinghua University, ndivo vanyori vanoenderana. Basa iri rakatsigirwa neNational Natural Science Foundation of China neBeijing Science Foundation for Outstanding Young People.
Nguva yekutumira: Gunyana-12-2023