Optical waveguide in curved and welded perovskite nanowires  

作　　者：ZHANG ZhenYu ZHANG YuPeng HONG BinBin WANG GuoPing 

机构地区：[1]College of Electronics and Information Engineering,Shenzhen University,Shenzhen 518060,China

出　　处：《Science China(Technological Sciences)》2023年第5期1471-1479,共9页中国科学（技术科学英文版）

基　　金：supported by the National Natural Science Foundation of China(NSFC)(Grant Nos.62005183,12074267,11734012,62105213,and 61975134);the Science and Technology Planning Project of Guangdong Province(Grant No.2020B010190001);the Shenzhen Fundamental Research Program(Grant No.20200814113625003);the Guangdong Basic and Applied Basic Research Foundation(Grant No.2020B15150-20051)。

摘　　要：Single-crystalline lead halide perovskite nanowires are emerging as promising one-dimensional blocks for nanoscience and nanotechnology,and extensive studies of nano-lasers and nano-photodetectors have been reported.However,as perfect confined structures,their optical waveguide performances have not been widely paid attention to up to now.Here,we report on the such issue on single-crystalline CsPbBr3nanowires and quantify it by near-field optical response mappings.The waveguide is verified as total internal reflection mode at the visible band(532 nm),and its far-field end-facet coupling efficiency of 89.6%and propagation loss as low as 5.9 dB/mm are measured from the nanowire with cross-sectional geometry of~600 nm×300 nm.No evident bending loss exists in naturally curved nanowires,while it usually emerges in artificial-bended ones due to the wrinkled surfaces.Naturally welded nanowire networks show significant advantages in integrated waveguides over the artificial assembled ones,due to the coupled photons at the space-confined end-facet segments.Roughened surface reasoned by lattice degradation is detrimental to propagation loss,but it provides leaked channels for waveguide coupling on nanowire surface.This work studies the optical waveguide performance of perovskite nanowires with different geometries and goes a step further for integrated nanophotonics.

关 键 词：optical waveguide perovskite nanowires SNOM curved nanowire welded networks 

分 类 号：TB383.1[一般工业技术—材料科学与工程]