An ultra-high extinction ratio broadband photonic crystal fiber splitter designed for the terahertz band

Chao Liu; Yuan Sun; Yanshu Zeng; Wei Liu; Jingwei Lv; Lin Yang; Jianxin Wang; Qiang Liu; Paul K. Chu

doi:10.1016/j.yofte.2025.104136

An ultra-high extinction ratio broadband photonic crystal fiber splitter designed for the terahertz band

Chao Liu^*, Yuan Sun, Yanshu Zeng, Wei Liu, Jingwei Lv, Lin Yang, Jianxin Wang, Qiang Liu, Paul K. Chu

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

2 Citations (Scopus)

Abstract

Terahertz (THz) polarization beam splitters (PBS) are valuable for applications in areas such as wireless high-speed communications and terahertz imaging. In this paper, a dual-core terahertz photonic crystal fiber (PCF) polarization beam splitter is proposed to achieve short length, high extinction ratio and wide bandwidth. This PBS has a cyclic olefin copolymer (COC) as the base material, and the dual-core structure is realized by introducing a central air hole. Performance analysis, conducted using the finite element method, reveals that the proposed PBS achieves a minimum length of 29.50688 mm, a bandwidth of 0.19 THz between 0.47 THz and 0.66 THz, and a maximum extinction ratio of −324.257 dB at an incident light frequency of 0.54 THz, where the two polarization modes are nearly completely separated. In addition, the PBS exhibits good manufacturing tolerances with a structural error of ± 1 %. These excellent properties indicate that THz PCF-PBS has great potential for applications in terahertz-band optical communication, optical sensing and optoelectronic detection. © 2025 Elsevier Inc.

Original language	English
Article number	104136
Journal	Optical Fiber Technology
Volume	90
Online published	23 Jan 2025
DOIs	https://doi.org/10.1016/j.yofte.2025.104136
Publication status	Published - Mar 2025

Funding

This work was jointly supported by the Heilongjiang Provincial Natural Science Foundation of China [JQ2023F001], National Natural Science Foundation of China [12304480], Local Universities Reformation and Development Personnel Training Supporting Project from Central Authorities, Natural Science Foundation of Heilongjiang Province [LH2021F007], China Postdoctoral Science Foundation funded project [2020 M670881], as well as City University of Hong Kong Donation Research Grants [9220061 and DON-RMG 9229021].

Research Keywords

Coupling length
Photonic crystal fiber
Polarization beam splitter
Terahertz

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

Access Output

10.1016/j.yofte.2025.104136

Other Access Options

Check CityUHK Library

Permanent Link

Right click to copy link

Cite this

@article{699c72c4c14a43f4af0bdf0de17241af,

title = "An ultra-high extinction ratio broadband photonic crystal fiber splitter designed for the terahertz band",

abstract = "Terahertz (THz) polarization beam splitters (PBS) are valuable for applications in areas such as wireless high-speed communications and terahertz imaging. In this paper, a dual-core terahertz photonic crystal fiber (PCF) polarization beam splitter is proposed to achieve short length, high extinction ratio and wide bandwidth. This PBS has a cyclic olefin copolymer (COC) as the base material, and the dual-core structure is realized by introducing a central air hole. Performance analysis, conducted using the finite element method, reveals that the proposed PBS achieves a minimum length of 29.50688 mm, a bandwidth of 0.19 THz between 0.47 THz and 0.66 THz, and a maximum extinction ratio of −324.257 dB at an incident light frequency of 0.54 THz, where the two polarization modes are nearly completely separated. In addition, the PBS exhibits good manufacturing tolerances with a structural error of ± 1 %. These excellent properties indicate that THz PCF-PBS has great potential for applications in terahertz-band optical communication, optical sensing and optoelectronic detection. {\textcopyright} 2025 Elsevier Inc.",

keywords = "Coupling length, Photonic crystal fiber, Polarization beam splitter, Terahertz",

author = "Chao Liu and Yuan Sun and Yanshu Zeng and Wei Liu and Jingwei Lv and Lin Yang and Jianxin Wang and Qiang Liu and Chu, {Paul K.}",

year = "2025",

month = mar,

doi = "10.1016/j.yofte.2025.104136",

language = "English",

volume = "90",

journal = "Optical Fiber Technology",

issn = "1068-5200",

publisher = "Academic Press Inc.",

}

TY - JOUR

T1 - An ultra-high extinction ratio broadband photonic crystal fiber splitter designed for the terahertz band

AU - Liu, Chao

AU - Sun, Yuan

AU - Zeng, Yanshu

AU - Liu, Wei

AU - Lv, Jingwei

AU - Yang, Lin

AU - Wang, Jianxin

AU - Liu, Qiang

AU - Chu, Paul K.

PY - 2025/3

Y1 - 2025/3

N2 - Terahertz (THz) polarization beam splitters (PBS) are valuable for applications in areas such as wireless high-speed communications and terahertz imaging. In this paper, a dual-core terahertz photonic crystal fiber (PCF) polarization beam splitter is proposed to achieve short length, high extinction ratio and wide bandwidth. This PBS has a cyclic olefin copolymer (COC) as the base material, and the dual-core structure is realized by introducing a central air hole. Performance analysis, conducted using the finite element method, reveals that the proposed PBS achieves a minimum length of 29.50688 mm, a bandwidth of 0.19 THz between 0.47 THz and 0.66 THz, and a maximum extinction ratio of −324.257 dB at an incident light frequency of 0.54 THz, where the two polarization modes are nearly completely separated. In addition, the PBS exhibits good manufacturing tolerances with a structural error of ± 1 %. These excellent properties indicate that THz PCF-PBS has great potential for applications in terahertz-band optical communication, optical sensing and optoelectronic detection. © 2025 Elsevier Inc.

AB - Terahertz (THz) polarization beam splitters (PBS) are valuable for applications in areas such as wireless high-speed communications and terahertz imaging. In this paper, a dual-core terahertz photonic crystal fiber (PCF) polarization beam splitter is proposed to achieve short length, high extinction ratio and wide bandwidth. This PBS has a cyclic olefin copolymer (COC) as the base material, and the dual-core structure is realized by introducing a central air hole. Performance analysis, conducted using the finite element method, reveals that the proposed PBS achieves a minimum length of 29.50688 mm, a bandwidth of 0.19 THz between 0.47 THz and 0.66 THz, and a maximum extinction ratio of −324.257 dB at an incident light frequency of 0.54 THz, where the two polarization modes are nearly completely separated. In addition, the PBS exhibits good manufacturing tolerances with a structural error of ± 1 %. These excellent properties indicate that THz PCF-PBS has great potential for applications in terahertz-band optical communication, optical sensing and optoelectronic detection. © 2025 Elsevier Inc.

KW - Coupling length

KW - Photonic crystal fiber

KW - Polarization beam splitter

KW - Terahertz

UR - http://www.scopus.com/inward/record.url?scp=85215602802&partnerID=8YFLogxK

UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85215602802&origin=recordpage

U2 - 10.1016/j.yofte.2025.104136

DO - 10.1016/j.yofte.2025.104136

M3 - RGC 21 - Publication in refereed journal

SN - 1068-5200

VL - 90

JO - Optical Fiber Technology

JF - Optical Fiber Technology

M1 - 104136

ER -

An ultra-high extinction ratio broadband photonic crystal fiber splitter designed for the terahertz band

Abstract

Funding

Research Keywords

UN SDGs

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

DON_RMG: Fabrication, Characterization, and Properties of Functional Materials - RMGS

DON: Surface Modification and Fabrication of Advanced Materials

Cite this

An ultra-high extinction ratio broadband photonic crystal fiber splitter designed for the terahertz band

Abstract

Funding

Research Keywords

UN SDGs

Access Output

Other Access Options

Permanent Link

Other Files and Links

Fingerprint

Projects

DON_RMG: Fabrication, Characterization, and Properties of Functional Materials - RMGS

DON: Surface Modification and Fabrication of Advanced Materials

Cite this