氮化硼纳米管同质结中的声子极化激元  

Phonon polaritons in boron nitride nanotube homojunctions

作　　者：王璇 戴小康 郭相东 李宁[3,4] 何沛一 高鹏 杨晓霞 戴庆[1,2] Xuan Wang;Xiaokang Dai;Xiangdong Guo;Ning Li;Peiyi He;Peng Gao;Xiaoxia Yang;&Qing Dai(CAS Key Laboratory of Standardization and Measurement for Nanotechnology,CAS Key Laboratory of Nanophotonic Materials and Devices,CAS Center for Excellence in Nanoscience,National Center for Nanoscience and Technology,Beijing 100190,China;Center of Materials Science and Optoelectronics Engineering,University of Chinese Academy of Sciences,Beijing 100049,China;International Center for Quantum Materials,School of Physics,Peking University,Beijing 100871,China;Electron Microscopy Laboratory,School of Physics,Peking University,Beijing 100871,China)

机构地区：[1]国家纳米科学中心,中国科学院纳米卓越中心,中国科学院纳米光子材料与器件重点实验室(筹),纳米标准与检测重点实验室,北京100190 [2]中国科学院大学材料与光电研究中心,北京100049 [3]北京大学物理学院,量子材料科学研究中心,北京100871 [4]北京大学物理学院,电子显微镜实验室,北京100871

出　　处：《科学通报》2023年第32期4415-4424,共10页Chinese Science Bulletin

基　　金：国家杰出青年科学基金(51925203,52125307);国家自然科学基金(52022025,51972074,52102160,11974023,52021006)资助。

摘　　要：六方氮化硼纳米管提供了一种原子尺度光滑的纳米光学结构,可以支持光波长高度压缩的双曲声子极化激元光波导模式和回音壁模式,有望用作光子集成回路中的一维波导.不同管壁厚度的氮化硼纳米管相互连接形成的同质结为声子极化激元提供了新的耦合调控途径.本文结合扫描透射电子显微镜中的电子能量损失谱技术和有限元电磁仿真模拟,研究了氮化硼纳米管同质结对声子极化激元传输的影响.研究结果表明,同质结界面处氮化硼纳米管一维波导的透过率与两侧波导的波矢匹配程度成正比,而这种波矢匹配可以通过几何结构设计进行调控.同时,研究还发现,同质结几乎不影响氮化硼纳米管中的回音壁模式,不同管壁厚度氮化硼管支持的不同双曲回音壁模式可在界面处100 nm范围内平滑过渡.本研究深化了对氮化硼纳米管同质结中声子极化激元的理解,特别是其一维波导传输调控特性和高性能回音壁模式,有望用于设计和制造纳米尺度光子学器件.With the development of information technology, there is an increasingly urgent demand for nanophotonic integratedcircuits with on-chip optical information processing capabilities. Polaritons supported in two-dimensional materials canbreak through the optical diffraction limit, enabling the confinement of light fields at the nanoscale and offering thepotential to construct nanophotonic integrated circuits. For instance, single atomic layer materials such as graphene andboron nitride support plasmon and hyperbolic phonon polaritons, which have been demonstrated to compress wavelengthsof light by over 100 times. One-dimensional nanotube structures can be considered as seamlessly rolled-up versions of twodimensionalmaterials, providing a naturally occurring one-dimensional nano-waveguide structure that can support highlyconfined polaritons.Interface coupling plays a crucial role in the transmission and modulation of optical signals. For example, effectiveinterface coupling can significantly reduce the insertion loss of waveguide couplers, thereby enhancing the efficiency ofoptical signal transmission. Additionally, interface coupling serves as an important method for optical signal modulation,allowing for the implementation of various efficient optical modulators. One-dimensional boron nitride nanotubehomojunctions can act as a coupling interface, featuring a structure combined with nanotubes of different outer diameterson either side of the homojunctions that support different waveguide modes.Studying the interfaces coupling effects at the boron nitride nanotube homojunction is instrumental in comprehending thepropagation and loss mechanisms of light within boron nitride nanotubes. This study employs scanning transmissionelectron microscopy (STEM) with electron energy loss spectroscopy (EELS) and numerical simulations to investigatephonon polaritons in one-dimensional hexagonal boron nitride nanotube homojunctions. Our simulations accuratelyreproduce experimental EELS signals, revealing the presence of both wavegui

关 键 词：氮化硼纳米管 声子极化激元 同质结 一维波导 回音壁模式 

分 类 号：TB383.1[一般工业技术—材料科学与工程] TQ128.1[化学工程—无机化工]