Abstract
We propose a novel porous-core photonic crystal fiber (PCF) consisting of an asymmetric rectangular air-holes in core and six-ring hexagonal lattice circular air-holes in the cladding for achieving low loss polarization terahertz transmission in wide frequency range. By assuming TOPAS as the host material, finite element mothed (FEM) is used to investigate its properties. The near-zero flattened dispersion of -0.01±0.02 ps/THz/cm is achieved over a frequency range of 1.0-2.0 THz, as well as a high birefringence of 7.1×10-2 which can be useful for polarization maintaining applications. Also, critical parameters such as modal field distribution, effective modal loss, confinement loss, effective mode area, are discussed in detail. Further, fabrication possibilities are discussed briefly by comparing recent work on similar waveguide structures.
Highlights
For the past few decades, Terahertz (THz) radiation or waves, which lie between microwave bands and infrared rays with a frequency range from 0.1 to 10 THz [1, 2], have intrigued researchers and pioneers because of its extensive applications ranging from security-sensitive areas to medical imaging, sensing, and spectroscopy [3,4,5,6,7]
In this paper, based on a TOPAS cyclic-olefin copolymer as the substrate, we propose a novel porous-core photonic crystal fiber (PCF) consisting of asymmetrical rectangular air holes in the core and hexagonal circular air holes in the cladding
One of our design goals is to make the PCF operate with high birefringence and ultra-low flat dispersion
Summary
For the past few decades, Terahertz (THz) radiation or waves, which lie between microwave bands and infrared rays with a frequency range from 0.1 to 10 THz [1, 2], have intrigued researchers and pioneers because of its extensive applications ranging from security-sensitive areas to medical imaging, sensing, and spectroscopy [3,4,5,6,7]. The new generation 6G communication technology requires highly integrated THz systems, which will further boost the research attention of a compact THz waveguide with higher birefringence, ultra-flattened dispersion, and low loss [18, 19]. Various novel properties can be exploited in ultrafast optics by exploring the peculiar dispersive properties of the THz waveguide [20,21,22]. Several devices such as optical delay lines, dispersion compensators for short pulse generation, and white light generators have been developed. Various types of waveguides have already been proposed, such as metallic wire
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