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基于光子晶体自准直效应的太赫兹偏振分束器设计

Design on Terahertz Polarization Beam Splitter Based on Self-Collimating Effect of Photonic Crystal

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摘要

提出了一种新型、紧凑的光子晶体太赫兹(THz)偏振分束器,利用自准直效应实现横电(TE)模和横磁(TM)模的无衍射传输,利用禁带特性实现TE模和TM模的分离。基于平面波展开法和时域有限差分法对太赫兹偏振分束器的性质进行仿真建模分析,结果表明,该偏振分束器在2.9~3.01 THz频率范围内可实现偏振分离;频率为3 THz时,TE模的反射率和TM模的透射率均高于90%,TE模和TM模的消光比分别高达19.9 dB和26.24 dB。此外,与以往的光子晶体太赫兹偏振分束器相比,所提出的偏振分束器设计简单,更易于实现(无需引入缺陷),尺寸更微小(650 μm×650 μm),带宽更宽(2.9~3.01 THz)。

Abstract

A novel and compact terahertz (THz) polarization beam splitter based on photonic crystal is proposed. Transmission without diffraction of transverse electric (TE) and transverse magnetic (TM) modes is realized by using the self-collimating effect, while the separation of TE and TM modes is realized by using the band gap characteristic. The characteristics of the terahertz polarization beam splitter is simulated and analyzed by using plane wave expansion method and time domain finite difference method. The results show that the polarization beam splitter can realize polarization separation in the frequency range of 2.9-3.01 THz. While the frequency is 3 THz, the reflectivity of TE mode and the transmittance of TM mode are both higher than 90%. The extinction ratios of TE and TM modes are 19.9 dB and 26.24 dB, respectively. Moreover, compared with the previous photonic crystal terahertz polarization beam splitters, the proposed polarization beam splitter is simpler to design, easier to realize (without defects), smaller in size (650 μm×650 μm) and wider in bandwidth (2.9-3.01 THz).

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中图分类号:TN256

DOI:10.3788/aos201838.0423001

所属栏目:光学器件

基金项目:国家自然科学基金(61571237)、南京邮电大学国家自然科学基金孵化项目基金(NY217047)、光电信息技术教育部重点实验室(天津大学)开放基金(2014KFKT003)、下一代无源光网络中基于硅基的复用/解复用和分光/合光的集成器件设计(2017外65)

收稿日期:2017-09-30

修改稿日期:2017-10-31

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汪静丽:南京邮电大学电子与光学工程学院、微电子学院, 江苏 南京 210023
刘洋:中国移动通信集团江苏有限公司盐城分公司, 江苏 盐城 224000
陈鹤鸣:南京邮电大学贝尔英才学院, 江苏 南京 210023

联系人作者:汪静丽(jlwang@njupt.edu.cn)

备注:汪静丽(1980-),女,博士,副教授,主要从事光纤通信与光波技术等方面的研究。E-mail: jlwang@njupt.edu.cn

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引用该论文

Wang Jingli,Liu Yang,Chen Heming. Design on Terahertz Polarization Beam Splitter Based on Self-Collimating Effect of Photonic Crystal[J]. Acta Optica Sinica, 2018, 38(4): 0423001

汪静丽,刘洋,陈鹤鸣. 基于光子晶体自准直效应的太赫兹偏振分束器设计[J]. 光学学报, 2018, 38(4): 0423001

被引情况

【1】孟方,王亚新,毛强,唐雄贵. 基于多模干涉结构的可调控偏振分束器设计与分析. 激光与光电子学进展, 2019, 56(5): 51301--1

【2】吴蓉,刘振,严清博,吴小所. 光子晶体八通道波分复用器研究. 激光与光电子学进展, 2019, 56(9): 91302--1

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