Highly efficient tunable optical filter based on liquid crystal micro-ring resonator with large free spectral range

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• 作者：Jing Dai ; Minming Zhang ; Feiya Zhou ; Deming Liu
• 关键词：integrated optics devices ; liquid crystals ; micro ; ring resonator ; slot waveguide ; wavelength tuning
• 刊名：Frontiers of Optoelectronics in China
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：9
• 期：1
• 页码：112-120
• 全文大小：648 KB
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• 作者单位：Jing Dai (1) (2)
  Minming Zhang (1) (2)
  Feiya Zhou (1) (2)
  Deming Liu (1) (2)
  
  1. School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, 430074, China
  2. Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan, 430074, China
  
• 刊物类别：Engineering
• 刊物主题：Electronic and Computer Engineering
  Electromagnetism, Optics and Lasers
  Biomedical Engineering
  Chinese Library of Science
  
• 出版者：Higher Education Press, co-published with Springer-Verlag GmbH
• ISSN：2095-2767

文摘

A highly efficient tunable optical filter of liquid crystal (LC) optical micro-ring resonator (MRR) was proposed. The 4-μm-radius ring consists of a silicon-on-insulator (SOI) asymmetric bent slot waveguide with a LC cladding. The geometry of the slot waveguide resulted in the strong electro-optic effect of the LC, and therefore induced an increase in effective refractive index by 0.0720 for the quasi-TE mode light in the slot-waveguide. The ultra-wide tuning range (56.0 nm) and large free spectral range (FSR) (~28.0 nm) of the optical filters enabled wavelength reconfigurable multiplexing devices with a drive voltage of only 5 V. The influences of parameters, such as the slot width, total width of Si rails and slot shift on the device’s performance, were analyzed and the optimal design was given. Moreover, the influence of fabrication tolerances and the loss of device were both investigated. Compared with state-of-the-art tunable MRRs, the proposed electrically tunable micro-ring resonator owns the excellent features of wider tuning ranges, larger FSRs and ultralow voltages.