Design of Low-loss and Highly Birefringent Porous-Core Photonic Crystal Fiber and Its Application to Terahertz Polarization Beam Splitter

We present the design of a porous-core PCF with elliptical holes in the core that achieved low loss, high birefringence, and flattened dispersion for guiding terahertz waves. The finite element method is used to study the properties of the designed waveguide in detail: effective material loss, biref...

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Bibliographic Details
Published in:IEEE photonics journal 2018-08, Vol.10 (4), p.1-13
Main Authors: Reyes-Vera, E., Usuga-Restrepo, J., Jimenez-Durango, C., Montoya-Cardona, J., Gomez-Cardona, N.
Format: Article
Language:English
Subjects:
Absorption
Birefringence
Broadband
Computer simulation
Core loss
Crystal fibers
Data transmission
Design
Dispersion
fiber optics devices
Finite element method
Optical losses
Optical waveguides
Photonic crystal fibers
Photonic crystals
Polarization
polarization splitter
polarization-selective devices
Polymers
Simulation
Terahertz frequencies
terahertz polymer fiber
terahertz wave
Ultrawideband
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Summary:We present the design of a porous-core PCF with elliptical holes in the core that achieved low loss, high birefringence, and flattened dispersion for guiding terahertz waves. The finite element method is used to study the properties of the designed waveguide in detail: effective material loss, birefringence, confinement losses, and dispersion. Simulation results show that the proposed structure exhibits simultaneously high modal birefringence of 1.32 × 10 -2 and a flattened dispersion over a broadband of 1.28 THz. Then, polarization splitters, based on both symmetric and asymmetric porous-core PCF structures, are designed and evaluated at 1 THz. We show that this kind of device exhibits a strong polarization-dependent coupling behavior. Numerical results show that the configuration based on dual-core waveguide with asymmetric cores can achieve a 10.9 cm long splitter with a broadband of 0.306 THz for x -polarization and 0.23 THz for y-polarization. Finally, this paper offers an effective method to design an ultrawideband polarization beam splitter to operate in the THz region, which might be relevant for future applications in technical areas, such as spectroscopy, sensing, and high-speed data transmission.
ISSN:1943-0655
1943-0647
DOI:10.1109/JPHOT.2018.2860251