基于表面等离子体诱导透明的半封闭T形波导侧耦合圆盘腔的波导滤波器

陈颖; 谢进朝; 周鑫德; 张灿; 杨惠; 李少华

doi:10.7498/aps.68.20191068

摘要

基于表面等离子体激元的传输及耦合特性, 提出了一种半封闭T形波导侧耦合圆盘腔的金属-介质-金属波导滤波器结构. 应用有限元法研究了其传输特性. 结果表明, 在透射光谱中出现了基于等离子诱导透明(PIT)效应的窄带透射峰. 通过理论分析与模场分布有效阐释了PIT透明峰与两侧谷值的物理产生机理, 同时数值研究表明通过改变支节长度与圆盘谐振腔半径可调节滤波器共振波长, 通过外调制来改变结构介质折射率可实现滤波波长的近似线性调节. 进一步, 在圆盘腔中内嵌增益介质, 增强了其对光的局域能力, 加强了模式共振作用, 实现了压缩滤波通带带宽的同时有效地提高了结构透射率, 相比同类滤波器获得了更好的滤波性能. 研究结果为高分辨率窄带滤波器的设计提供了有效的理论参考.

关键词:

Abstract

Filter is the core communication device in optical integrated chip. In recent years, plasma-induced transparency in surface plasmon (SPP) subwavelength waveguide photonic deviceshas become a research hotspot in the field of nano optics. The plasmon-induced transparency (PIT) is a phenomenon that the original absorption region produces a sharp transparent window due to the interaction among different resonant modes of SPPs, therefore, a higher resolution and quality factor surface plasmons can be obtained by using this feature to design a metal-medium-metal (MIM) waveguide structure filter. However, due to the Ohmic loss caused by metal parts, further research is needed on how to effectively improve transmission efficiency and achieve better frequency selection and filtering effect while reducing filter bandwidth in MIM waveguide filter. Based on the transmission and coupling characteristics of SPPs, an MIM waveguide filter with semi-closed T-waveguide side coupled disc cavity is proposed.Its transmission characteristics are studied by using the finite element method. The results show that a narrow-band transmission peak based on plasma-induced transparency appears in the transmission spectrum. Through theoretical analysis and mode field distribution, the physical mechanism of generating the PIT transparent peak and valley values on both sides is effectively explained. Compared with the traditional straight waveguide structure, the curved waveguide structure can generate the bilateral coupling effect, which can make resonant interaction stronger. Meanwhile, the numerical study shows that the approximately linear adjustment of filter wavelength can be achieved by changing the length of branches, the radius of the disk cavity and the refractive index of the medium in the cavity through external modulation. Further, the gain medium is embedded in the disk cavity, which enhances its local ability to emit light, strengthens the mode resonance effect, and realizes the compression filter pass-band bandwidth while effectively improving the structural transmittance, compared with similar filters. The research results provide an effective theoretical reference for designing the high resolution narrowband filter.

Keywords:

作者及机构信息

1.
燕山大学电气工程学院, 测试计量技术与仪器河北省重点实验室, 秦皇岛　066004

2.
河北先河环保科技股份有限公司, 石家庄　050000

通信作者: 陈颖, chenying@ysu.edu.cn

基金项目: 国家自然科学基金(批准号: 61201112, 61475133)、河北省重点研发计划项目(批准号: 19273901D)、河北省自然科学基金(批准号: F2016203188)、中国博士后基金项目(批准号: 2018M630279)、河北省博士后择优资助项目(批准号: D2018003028)、河北省高等学校科学技术研究项目(批准号: ZD2018243)和中国国家留学基金(批准号: 201808130004)资助的课题

Authors and contacts

1.
Hebei Province Key Laboratory of Test/Measurement Technology and Instrument, School of Electrical Engineering, Yanshan University, Qinhuangdao 066004, China

2.
Hebei Sailhero Environmental Protection Hi-tech Co., Ltd, Shijiazhuang 050000, China

Corresponding author: Chen Ying, chenying@ysu.edu.cn

Funds: Project supported by the National Natural Science Foundation of China (Grant Nos. 61201112, 61475133), the Key Research and Development Project of Hebei Province, China (Grant No. 19273901D), the Natural Science Foundation of Hebei Province, China (Grant No. F2016203188), the China Postdoctoral Science Foundation (Grant No. 2018M630279), the Post-Doctoral Research Projects in Hebei Province, China (Grant No. D2018003028), the Scientific Research Foundation of the Higher Education Institutions of Hebei Province, China (Grant No. ZD2018243), and the China National Scholarship Fund Project (Grant No. 201808130004)

文章全文

参考文献

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施引文献

图 1 MIM波导滤波器结构示意图

Fig. 1. Structure schematics of the MIM waveguide filter.

下载: 全尺寸图片幻灯片

图 2 三种波导结构的透射光谱

Fig. 2. The transmission spectrum with three kinds of structures.

下载: 全尺寸图片幻灯片

图 3 Structure 3电场强度E分布　(a)共振波长左侧谷; (b)共振波长处; (c)共振波长右侧谷

Fig. 3. Electric filed intensity (E) distribution of Structure 3: (a) At the left dip of the resonance wavelength; (b) at the resonance wavelength; (c) at the right dip of the resonance wavelength.

下载: 全尺寸图片幻灯片

图 4 结构参数对滤波特性的影响　(a)不同L₃和r时滤波器的透射谱; (b)不同g时的透射谱; (c)透射峰共振波长与L₃和r的关系; (d)不同共振波长处L₃和r的关系

Fig. 4. Influence of parameters on filter characteristics: (a) Transmission spectra of the filter for different parameters of L₃ and r; (b) for different parameters of g; (c) relationship between resonance wavelength and L₃ and r; (d) relation curves of L₃ and r for different resonance peaks.

下载: 全尺寸图片幻灯片

图 5 结构内填充不同折射率的介质　(a) 透射光谱; (b) 共振波长与介质折射率的关系

Fig. 5. Structures filled by different materials with different indexes: (a) Transmission spectra; (b) relationship curves between resonant wavelength and refractive index.

下载: 全尺寸图片幻灯片

图 6 圆盘腔内嵌增益介质滤波器结构　(a) 二维结构图; (b) 不同${\varepsilon _i}$时透射光谱

Fig. 6. Nano disk-cavity embedded gain medium filter structure: (a) Two-dimensional structure diagram; (b) transmission spectra for different${\varepsilon _i}$.

下载: 全尺寸图片幻灯片

图 7 PIT共振波长处电场强度与稳态磁场分布　(a) 电场强度场; (b) 稳态磁场

Fig. 7. Electric filed intensityand steady state magnetic field distribution at resonant wavelengths of PIT: (a) Electric filed intensity; (b) steady state magnetic field.

下载: 全尺寸图片幻灯片

[1]	Barnes W L, Dereux A, Ebbesen T W 2003 Nature 424 824 Google Scholar
[2]	Ozbay E 2006 Science 311 189 Google Scholar
[3]	Jun Z, Xu W J, Xu Z J, Fu D L, Song S X, Wei D Q 2017 Optik 134 187 Google Scholar
[4]	Chen Y, Luo P, Zhao Z Y, He L, Cui X N 2017 Phys. Lett. A 381 3472 Google Scholar
[5]	Liu Y, Zhou F, Yao B, Cao J, Mao Q H 2013 Plasmonics 8 1035 Google Scholar
[6]	祁云平, 张雪伟, 周培阳, 胡兵兵, 王向贤 2018 物理学报 67 197301 Google Scholar Qi Y P, Zhang X W, Zhou P Y, Hu B B, Wang X Y 2018 Acta Phys. Sin. 67 197301 Google Scholar
[7]	Zhang X Y, Hu A, Wen J Z, Zhang T, Xue X J, Zhou Y, Duley WW 2010 Opt. Express 18 18945 Google Scholar
[8]	张志东, 赵亚男, 卢东, 熊祖洪, 张中月 2012 物理学报 61 187301 Google Scholar Zhang Z D, Zhao Y N, Lu D, Xiong Z H, Zhang Z Y 2012 Acta Phys. Sin. 61 187301 Google Scholar
[9]	Tao J, Huang X G, Lin X S, Chen J H, Zhang Q, Jin X P 2010 J. Opt. Soc. Am. 27 323 Google Scholar
[10]	Yun B F, Hu G H, Cui Y P 2013 Plasmonics 8 267 Google Scholar
[11]	Wang T B, Wen X W, Yin C P, Wang H Z 2009 Opt. Express 17 24096 Google Scholar
[12]	Mei X, Huang X, Tao J, Zhu J H, Zhu Y J, Jin X P 2010 J. Opt. Soc. Am. B 27 2707 Google Scholar
[13]	Wang L, Li W, Jiang X 2015 Opt. Lett. 40 2325 Google Scholar
[14]	Chen J, Wang C, Zhang R, Xiao J 2012 Opt. Lett. 37 5133 Google Scholar
[15]	杨韵茹, 关建飞 2016 物理学报 65 057301 Google Scholar Yang Y R, Guan J F 2016 Acta Phys. Sin. 65 057301 Google Scholar
[16]	Kim K Y, Cho Y K, Tae H S, Lee J H 2006 Opt. Express 14 320 Google Scholar
[17]	Haus H A 1984 Waves and Fields in Optoelectronics (Englewood Cliffs, NJ: Prentice-Hall) pp56–59
[18]	Chremmos I 2009 J. Opt. Soc. Am. 26 2623 Google Scholar
[19]	Zhang Q, Huang X G, Lin X S, Tao J, Jin X P 2009 Opt. Express 17 7549 Google Scholar
[20]	Vlasov Y A, O'Boyle M, Hamann H F, McNab S J 2005 Nature 438 65 Google Scholar
[21]	Nezhad M, Tetz K, Fainman Y 2004 Opt. Express 12 4072 Google Scholar
[22]	Chen X, Bhola B, Huang Y, Ho S T 2010 Opt. Express 18 17220
[23]	Babicheva V E, Kulkova I V, Malureanu R, Yvind K, Lavrinenko A V 2010 Phys. Opt. 10 389
[24]	Yu Z, Veronis G, Fan S 2008 Appl. Phys. Lett. 92 041117 Google Scholar

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基于表面等离子体诱导透明的半封闭T形波导侧耦合圆盘腔的波导滤波器