ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS |
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Photonic crystal fiber polarization filter with two large apertures coated with gold layers |
Jun-Jun Wu(吴君君)1,2, Shu-Guang Li(李曙光)1, Qiang Liu(刘强)1, Min Shi(石敏)1 |
1. Physics Department, College of Science, Yanshan University, Qinhuangdao 066004, China; 2. College of Qing Gong, North China University of Science and Technology, Tangshan 063009, China |
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Abstract A novel photonic crystal fiber (PCF) polarization filter is designed and fabricated; it consists of two large apertures coated with gold. The asymmetric structure separates the resonance position in the vertical direction well. Due to the metal layer covering, loss is greatly improved. Finite element method is applied for numerical simulation. The influences of varying gold thickness and varying the diameters and the center positions of the larger apertures on filtering performance are evaluated. Theory of coupling between surface plasma and core mode is introduced. By modulating the parameters, we realize a single polarization filter at 1.31 μm and 1.55 μm. The basal mode loss in the y direction can reach 1408.80 dB/cm at 1.31 μm and 1911.22 dB/cm at 1.55 μm respectively, but basal mode loss in the x direction is relatively small, 0.82 dB/cm and 1.87 dB/cm. In addition, two kinds of broadband polarization filters are proposed. If the fiber length is set to 200 μm, the extinction ratio is greater than 20 dB with width of 570 nm and 490 nm. The filter has simple structure and excellent performance.
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Received: 13 April 2017
Revised: 21 June 2017
Accepted manuscript online:
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PACS:
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42.79.Ci
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(Filters, zone plates, and polarizers)
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42.70.Qs
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(Photonic bandgap materials)
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Fund: Project supported by the National Natural Science Foundation of China (Grants Nos. 61475134 and 61505175) and Key Program of the Natural Science Foundation of HeBei Province, China (Grant No. F2017203193). |
Corresponding Authors:
Shu-Guang Li
E-mail: shuguangli@ysu.edu.cn
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Cite this article:
Jun-Jun Wu(吴君君), Shu-Guang Li(李曙光), Qiang Liu(刘强), Min Shi(石敏) Photonic crystal fiber polarization filter with two large apertures coated with gold layers 2017 Chin. Phys. B 26 114209
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