首页|氮化硼纳米管同质结中的声子极化激元

氮化硼纳米管同质结中的声子极化激元

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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100nm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.
Phonon polaritons in boron nitride nanotube homoj unctions
With the development of information technology,there is an increasingly urgent demand for nanophotonic integrated circuits with on-chip optical information processing capabilities.Polaritons supported in two-dimensional materials can break through the optical diffraction limit,enabling the confinement of light fields at the nanoscale and offering the potential to construct nanophotonic integrated circuits.For instance,single atomic layer materials such as graphene and boron nitride support plasmon and hyperbolic phonon polaritons,which have been demonstrated to compress wavelengths of light by over 100 times.One-dimensional nanotube structures can be considered as seamlessly rolled-up versions of two-dimensional materials,providing a naturally occurring one-dimensional nano-waveguide structure that can support highly confined polaritons.Interface coupling plays a crucial role in the transmission and modulation of optical signals.For example,effective interface coupling can significantly reduce the insertion loss of waveguide couplers,thereby enhancing the efficiency of optical 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 nanotube homojunctions can act as a coupling interface,featuring a structure combined with nanotubes of different outer diameters on 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 the propagation and loss mechanisms of light within boron nitride nanotubes.This study employs scanning transmission electron microscopy(STEM)with electron energy loss spectroscopy(EELS)and numerical simulations to investigate phonon polaritons in one-dimensional hexagonal boron nitride nanotube homojunctions.Our simulations accurately reproduce experimental EELS signals,revealing the presence of both waveguide modes along the tube axis and resonant whispering-gallery modes along the tube's sidewall within the homojunction.At the interface,the transmission of waveguide modes along the tube axis is proportional to wave vector matching,decreasing as the frequency rises.Moreover,by manipulating the dimensions of the nanotubes at both ends,we can modulate the waveguide mode's transmission between 0％and 100％.In addition,different hyperbolic whispering-gallery modes supported by boron nitride nanotubes of varying diameters can smoothly transition within a 100-nanometer range at the interface.In conclusion,this paper combines the use of EELS in STEM and computational simulations to investigate the interface coupling in boron nitride nanotube homojunctions of one-dimensional waveguide modes and whispering-gallery modes of phonon polaritons.The study uncovers a direct proportionality between the transmission of one-dimensional waveguide modes at the homojunction interface and the wave vector matching on both sides of the waveguide.Additionally,the modulation of the one-dimensional waveguide mode's transmission is achievable by adjusting the nanotube sizes on both ends of the interface.Meanwhile,the homojunction has minimal impact on the whispering-gallery modes within the boron nitride nanotube.This research contributes to a deeper comprehension of phonon polariton waveguides in one-dimensional boron nitride nanotube homojunctions,advancing the field of nanophotonic devices.

boron nitride nanotubesphonon polaritonhomojunctionone-dimensional waveguidewhispering-gallery mode

王璇、戴小康、郭相东、李宁、何沛一、高鹏、杨晓霞、戴庆

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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

中国科学院大学材料与光电研究中心,北京 100049

北京大学物理学院,量子材料科学研究中心,北京 100871

北京大学物理学院,电子显微镜实验室,北京 100871

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氮化硼纳米管 声子极化激元 同质结 一维波导 回音壁模式

国家杰出青年科学基金国家杰出青年科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金

51925203521253075202202551972074521021601197402352021006

2023

10.1360/TB-2023-0662

科学通报
中国科学院国家自然科学基金委员会

科学通报

CSTPCDCSCD北大核心
影响因子：1.269
ISSN：0023-074X
年,卷(期)：2023.68(32)
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