IEEE Photonics Journal Design of Photonic Crystal Fiber Filter With Narrow Width
Design of Photonic Crystal Fiber Filter
With Narrow Width and
Single-Polarization Based on Surface
Plasmon Resonance
Mingqin Li,
1,2
Lu Peng,
1,2
Guiyao Zhou,
1,2
Boyao Li,
1,2
Zhiyun Hou,
1,2
and Changming Xia
1,2
1
Guangzhou Key Laboratory for Special Fiber Photonic Devices, South China Normal
University, Guangzhou, 510006, China
2
Guangdong Provincial Engineering Technology Research Center for Microstructured
Functional Fibers and Devices, South China Normal University, Guangzhou 510006, China
DOI:10.1109/JPHOT.2017.2703979
1943-0655
C
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Manuscript received March 28, 2017; revised May 7, 2017; accepted May 9, 2017. Date of publication
May 18, 2017; date of current version May 24, 2017. This work was supported by the National Natural
Science Foundation of China Grant 61575066, Grant 60377100, Grant 61527822, and Guangdong
Natural Science Foundation Grant 2014A030313428. Corresponding author: Guiyao Zhou (e-mail:
gyzhou@scnu.edu.cn).
Abstract: In this paper, we p resent a photonic crystal fiber (PCF) filter that it has the
advantageous properties of narrow width and single-polarization through the principle of
surface plasmon resonance (SPR) by a full-vector modal solver based on the finite element
method. Gold nanowire is used as the SPR active metal and be filled into cladding air holes
selectively. The proposed PCF can be used as a perfect polarization filter at 1.31 or 1.55 μm
from y-polarized mode, respectively, if the appropriate sizes of the cladding air holes are
selected. Only 13 nm that the full width at half maximum is able to achieve with one gold
nanowire, and when the PCF is filled two gold nanowires, with a length of 1 mm of the
designed PCF, the bandwidths with the crosstalk better than 30 dB can reach up to 235 nm,
at the wavelength of 1.55 μm. The results indicate that the polarized light in one direction
can be filtered out selectively by adjusting diameter of air holes and achieve filtering effect
in communication bands.
Index Terms: Photonic crystal fiber (PCF), surface plasmon resonance (SPR), polarization
filter, finite element method (FEM).
1. Introduction
Realizing miniaturization and integration of photonic devices is a developing trend of optical fiber
devices. Photonic crystal fibers (PCFs) [1] have been widely applied many fields such as biology,
chemistry, and medicine because of their flexible and controllable characteristics in the late years.
What’s more, through selectively filling the cladding air holes with materials such as liquid crystal
[2], semiconductor [3], or metal [4] that the optical properties of silica-air PCFs can be extended
effectively. In metal-PCF, when the original electromagnetic environment has been disturbed, and
surface plasmon resonance (SPR) could be excited once the modes match with each other between
fiber modes and plasmonic modes [5], which have a great influence in the area of optical sens-
ing and sub-wavelength [6]. It is strongly wavelength-dependent transmissions that we can see in
Vol. 9, No. 3, June 2017 5700108
