Study on the high birefringence and low confinement loss terahertz fiber based on the combination of double negative curvature and nested claddings

Abstract A novel double negative curvature nested fiber structure is designed by adding extra circular cladding tubes to enhance the birefringence and reduce the confinement loss. The fiber structure is composed of eight circular cladding tubes and two semi-elliptical nested tubes. The transmission performances of terahertz fiber, including birefringence, confinement loss, dispersion and effective mode field area, are studied by changing the parameters of cladding tubes. In the frequency range of 1.75 - 2.6 THz, the broad bandwidth of 850 GHz with high birefringence (above 10-4) can be achieved. The confinement loss of y-polarization mode with the frequency of 2.575 THz can be as low as 0.00231 dB/cm. The waveguide dispersion coefficient is between ±0.188 ps/(THz•cm) in the frequency range of 2.0 - 2.475 THz. The maximum effective mode field area of x- polarization mode is 2.618×10-6 m2 at 2.6 THz.

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Numerical Analysis of Spatial Mode-Field Overlap on Confinement Loss in Negative-Curvature Fibers

Frontiers in Optics / Laser Science ◽

10.1364/fio.2020.fm4d.4 ◽

2020 ◽

Author(s):

Ang Deng ◽

Md Imran Hasan ◽

Yuxi Wang ◽

Wonkeun Chang

Keyword(s):

Numerical Analysis ◽

Negative Curvature ◽

Confinement Loss ◽

Spatial Mode ◽

Mode Field

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Hollow-Core Negative Curvature Fiber with High Birefringence for Low Refractive Index Sensing Based on Surface Plasmon Resonance Effect

Sensors ◽

10.3390/s20226539 ◽

2020 ◽

Vol 20 (22) ◽

pp. 6539

Author(s):

Shi Qiu ◽

Jinhui Yuan ◽

Xian Zhou ◽

Feng Li ◽

Qiwei Wang ◽

...

Keyword(s):

Negative Curvature ◽

Resonance Effect ◽

Confinement Loss ◽

Hollow Core ◽

Analysis Method ◽

High Birefringence ◽

Surface Plasmon Resonance Effect ◽

Loss Method ◽

Gold Wires ◽

Low Refractive Index

In this paper, a hollow-core negative curvature fiber (HC-NCF) with high birefringence is proposed for low refractive index (RI) sensing based on surface plasmon resonance effect. In the design, the cladding region of the HC-NCF is composed of only one ring of eight silica tubes, and two of them are selectively filled with the gold wires. The influences of the gold wires-filled HC-NCF structure parameters on the propagation characteristic are investigated by the finite element method. Moreover, the sensing performances in the low RI range of 1.20–1.34 are evaluated by the traditional confinement loss method and novel birefringence analysis method, respectively. The simulation results show that for the confinement loss method, the obtained maximum sensitivity, resolution, and figure of merit of the gold wires-filled HC-NCF-based sensor are −5700 nm/RIU, 2.63 × 10−5 RIU, and 317 RIU−1, respectively. For the birefringence analysis method, the obtained maximum sensitivity, resolution, and birefringence of the gold wires-filled HC-NCF-based sensor are −6100 nm/RIU, 2.56 × 10−5 RIU, and 1.72 × 10−3, respectively. It is believed that the proposed gold wires-filled HC-NCF-based low RI sensor has important applications in the fields of biochemistry and medicine.

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Epsilon Near Zero (ENZ) Based Kagome Photonic Crystal Fiber for Low Loss, High Birefringence and Near Zero Flat Dispersion in THz Regime

10.21203/rs.3.rs-599601/v1 ◽

2021 ◽

Author(s):

Sayed Asaduzzaman ◽

Hasin Rehana ◽

M. D. Tanzil Aziz ◽

Osama S. Faragallah ◽

Mohammed Baz ◽

...

Keyword(s):

Total Loss ◽

Confinement Loss ◽

Frequency Range ◽

Low Loss ◽

Material Loss ◽

High Birefringence ◽

Crystal Fiber ◽

Bending Loss ◽

Background Material ◽

Epsilon Near Zero

Abstract In this research, we have proposed two novel types of Kagome PCFs one is slotted core PCF (S-KPCF) and another one is circular PCF (C-KPCF). FEM has been applied with boundary condition to investigate the optical properties of Proposed PCFs. HRS material along with Epsilon Near Zero (ENZ) material has been applied in core and TOPAS was used as background material. Numerical investigation takes place a wider frequency range for 0.8 THz to 2 THz. Slotted core PCF (S-KPCF) shows eminent birefringence of 2.98×10− 2, Lower EML of 0.232 cm− 1, lower confinement loss of 2.76×10− 8, Bending loss 10.76×10− 9, Total loss of 0.232cm− 1 at frequency 1THz. Besides circular core PCF (C-KPCF) shows eminent birefringence of 8.69×10− 2, Lower effective material loss of 0.746 cm− 1, lower confinement loss of 2.80×10− 7, Bending loss 7.76×10− 9, Total loss of 0.746cm− 1 at 1THz. Both PCFs show flat dispersion near zero (for S-KPCF is -0.997ps/nm/Km and for C-KPCF is -0.797ps/nm/Km) range. V-Parameter of both of the PCF indicates that both PCF is multimode PCF. Comparison of the proposed PCFs shows that C-KPCF shows better results than S-KPCF and both PCFs shows better results than previous PCFs.

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Design and analysis of trench-assisted large-mode-field-area multi-core fiber with air-hole

Applied Physics B ◽

10.1007/s00340-020-07557-7 ◽

2021 ◽

Vol 127 (1) ◽

Author(s):

Yuqin Zhang ◽

Yudong Lian ◽

Yuhe Wang ◽

Jingbo Wang ◽

Mengxin Yang ◽

...

Keyword(s):

Mode Field ◽

Core Fiber ◽

Field Area ◽

Air Hole

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Design and Characterization of an Ultra Low Loss, Dispersion-Flattened Slotted Photonic Crystal Fiber for Terahertz Application

Journal of Optical Communications ◽

10.1515/joc-2018-0152 ◽

2018 ◽

Vol 0 (0) ◽

Cited By ~ 1

Author(s):

Mohammad Rakibul Islam ◽

Md. Arif Hossain ◽

Syed Iftekhar Ali ◽

Jakeya Sultana ◽

Md. Saiful Islam

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Single Mode ◽

Confinement Loss ◽

Terahertz Frequency ◽

Frequency Range ◽

Low Loss ◽

Material Loss ◽

Crystal Fiber

AbstractA novel photonic crystal fiber (PCF) based on TOPAS, consisting only rectangular slots is presented and analyzed in this paper. The PCF promises not only an extremely low effective material loss (EML) but also a flattened dispersion over a broad frequency range. The modal characteristics of the proposed fiber have been thoroughly investigated using finite element method. The fiber confirms a low EML of 0.009 to 0.01 cm−1 in the frequency range of 0.77–1.05 THz and a flattened dispersion of 0.22±0.01 ps/THz/cm. Besides, some other significant characteristics like birefringence, single mode operation and confinement loss have also been inspected. The simplicity of the fiber makes it easily realizable using the existing fabrication technologies. Thus it is anticipated that the new fiber has the potential to ensure polarization preserving transmission of terahertz signals and to serve as an efficient medium in the terahertz frequency range.

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High birefringent, low loss and flattened dispersion asymmetric slotted core-based photonic crystal fiber in THz regime

International Journal of Modern Physics B ◽

10.1142/s0217979219502187 ◽

2019 ◽

Vol 33 (20) ◽

pp. 1950218 ◽

Cited By ~ 4

Author(s):

Md. Khairum Monir ◽

Mahmudul Hasan ◽

Bikash Kumar Paul ◽

Kawsar Ahmed ◽

Hala J. El-Khozondar ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Real Life ◽

Simulation Software ◽

Confinement Loss ◽

Low Loss ◽

Material Loss ◽

Scattering Loss ◽

High Birefringence ◽

Crystal Fiber

This paper proposes a novel model to attain high birefringence and low loss in a slotted core-based photonic crystal fiber (PCF) structure in THz regime. The performance of the proposed PCF has been evaluated by applying finite element method (FEM) with full simulation software COMSOL Multiphysics V-5.1. The proposed model gains good optical properties such as high birefringence of 0.24, low effective material loss (EML) of 0.03 cm[Formula: see text], low confinement loss of 6.5 × 10[Formula: see text] (dB/m), low scattering loss of 2 × 10[Formula: see text] (dB/m) and low bending loss of 7.4 × 10[Formula: see text] (dB/cm). The proposed structure also exhibits the flattened dispersion for wider frequency response. However, the real-life fabrication of the suggested model is highly feasible using the current technology due to the unique shape of circular air holes in the cladding region. The outcomes make the proposed PCF a stronger candidate for polarization-preserving applications such as sensing, communications and filtering operations in THz band.

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