Nanoscale thickness Octave-spanning coherent supercontinuum light generation  

作　　者：Susobhan Das Md Gius Uddin Diao Li Yadong Wang Yunyun Dai Juha Toivonen Hao Hong Kaihui Liu Zhipei Sun 

机构地区：[1]Department of Electronics and Nanoengineering,Aalto University,Espoo,Finland [2]QTF Centre of Excellence,Department of Applied Physics,Aalto University,Aalto,Finland [3]Department of Engineering and Natural Sciences,Tampere University,Tampere,Finland [4]State Key Laboratory for Mesoscopic Physics and Frontiers Science Center for Nano-optoelectronics,School of Physics,Peking University,Beijing,China

出　　处：《Light(Science & Applications)》2025年第2期366-373,共8页光(科学与应用)(英文版)

基　　金：support from the Academy of Finland(Grant Nos.314810,333982,336144 and 336818);the Academy of Finland Flagship Program(Grant No.320167,PREIN);the European Union's Horizon 2020 research and innovation program(Grant No.820423,S2QUIP);the EU H2020-MSCA-RISE-872049(IPN-Bio)and ERC(Grant No.834742).

摘　　要：Coherent broadband light generation has attracted massive attention due to its numerous applications ranging from metrology,sensing,and imaging to communication.In general,spectral broadening is realized via third-order and higher-order nonlinear optical processes(e.g.,self-phase modulation,Raman transition,four-wave mixing,multiwave mixing),which are typically weak and thus require a long interaction length and the phase matching condition to enhance the efficient nonlinear light-matter interaction for broad-spectrum generation.Here,for the first time,we report octave-spanning coherent light generation at the nanometer scale enabled by a phase-matching-free frequency down-conversion process.Up to octave-spanning coherent light generation with a-4odB spectral width covering from~565 to 1906 nm is demonstrated in discreate manner via difference-frequency generation,a second-order nonlinear process in galium selenide and niobium oxide diodide crystals at the 100-nanometer scale.Compared with conventional coherent broadband light sources based on bulk materials,our demonstration is~5 orders of magnitude thinner and requires~3 orders of magnitude lower excitation power.Our results open a new way to possibly create compact,versatile and integrated ultra-broadband light sources.

关 键 词：frequency down conversion COHERENT nonlinear optics nanoscale light generation coherent broadband light generation octave spanning SUPERCONTINUUM 

分 类 号：O43[机械工程—光学工程]