采用人工表面等离激元电极的慢光铌酸锂电光调制器  

Slow-Light Lithium Niobate Electro-Optic Modulators with Spoof Surface Plasmon Polaritons Electrodes

作　　者：徐光耀 马晓飞 盛冲 刘辉[1] Xu Guangyao;Ma Xiaofei;Sheng Chong;Liu Hui(Collaborative Innovation Center of Advanced Microstructures,National Laboratory of Solid State Microstructures,School of Physics,Nanjing University,Nanjing 210093,Jiangsu,China)

机构地区：[1]南京大学物理学院固体微结构物理国家重点实验室,人工微结构科学与技术协同中心,江苏南京210093

出　　处：《光学学报》2023年第19期264-270,共7页Acta Optica Sinica

基　　金：国家自然科学基金(92163216,92150302,62288101)。

摘　　要：高速率、低功耗的小型化电光调制器是现代电通信网络和微波光子系统的关键组成部分。基于人工表面等离激元的慢光效应,设计了一种利用金属光子晶体电极的马赫-曾德尔干涉仪电光调制器。通过在薄膜铌酸锂光子芯片上调控微波色散与群速度,实现了微波与光波之间更强的相互耦合作用。对电光重叠积分因子的分析表明,这种结构相较条形电极结构可以通过更短的传播长度得到相同的相移,实现高效的调制过程。同时,所提慢光效应结构也可以应用于其他集成化的电光器件。Objective Due to the current explosive growth of data traffic,optical transmission systems need to move towards the direction of high speed and low power consumption through modulation.Miniaturized electro-optic modulators are the key components of modern electrical communication networks and microwave-photon systems,which can convert electrical signals into optical domains.Traditional monolithic integrated electro-optic modulators require long electrodes to induce large optical phase shifts and therefore require a trade-off between electro-optic bandwidth and half-wave voltage,which cannot be met with large bandwidth and low voltage simultaneously.To address the above problem,researchers have proposed various solutions with different materials and waveguide structures.However,existing structures are generally weakly bound to the electric fields,and the mutual coupling strength between optical wave and microwave is limited,resulting in low modulation efficiency and large device size.If the modulated microwave can be enhanced to increase the coupling strength between electromagnetic fields in the waveguide,the optical wave can obtain a larger phase shift when the same driving voltage is applied.Therefore,we wish to propose a structure that can dramatically increase the electrooptic overlap volume and coupling strength between optical wave and microwave,so as to improve the electro-optic modulation efficiency and overcome the trade-off between bandwidth and voltage.Methods In this paper,a model based on the slow-light effect of spoof surface plasmonic polaritons is utilized to obtain a thin-film lithium niobate Mach-Zehnder interferometer electro-optic modulator.Taking advantage of the large electro-optic coefficient of lithium niobate and the characteristics of metal photonic crystal to limit the microwave within the subwavelength scale,the electro-optic modulator can significantly enhance efficiency.Moreover,we can flexibly adjust structural parameters to achieve the desired function according to our demands.Spec

关 键 词：光学器件 电光调制器 人工表面等离激元 慢光效应 薄膜铌酸锂 

分 类 号：O436[机械工程—光学工程]