scholarly journals A Novel Ultra-Low Loss Rectangle-Based Porous-Core PCF for Efficient THz Waveguidance: Design and Numerical Analysis

Sensors ◽  
2020 ◽  
Vol 20 (22) ◽  
pp. 6500
Author(s):  
Abdullah Al-Mamun Bulbul ◽  
Farjana Imam ◽  
Md. Abdul Awal ◽  
M. A. Parvez Mahmud
Keyword(s):  
Numerical Analysis ◽  
Numerical Aperture ◽  
Effective Area ◽  
Lower Amount ◽  
Confinement Loss ◽  
Optical Parameters ◽  
Material Loss ◽  
Crystal Fiber ◽  
Porous Core ◽  
Standard Values

A novel, rectangle-based, porous-core photonic crystal fiber (PCF) has been modeled for the efficient propagation of a THz wave. The performance of the anticipated model has been assessed using the finite element method (FEM) in the range of 0.5–1.5 THz. Both the fiber core and cladding are modeled with rectangular air holes. Numerical analysis for this model reveals that the model has a lower amount of dispersion of about 0.3251 ps/THz/cm at 1.3 THz. Compared to the other THz waveguides, the model offers an ultra-lower effective material loss of 0.0039 cm−1 at the same frequency. The confinement loss is also lower for this model. Moreover, this model has a high-power fraction of about 64.90% at the core in the x-polarization mode. However, the effective area, birefringence, and numerical aperture have also been evaluated for this model. Maintenance of standard values for all the optical parameters suggests that the proposed PCF can efficiently be applied in multichannel communication and several domains of the THz technology.

scholarly journals PCF Design With Extremely High Nonlinearity And Extremely Negative Dispersion

2021 ◽  
Author(s):  
Sanat Kumar Pandey ◽  
J.B. Maurya ◽  
Yogendra Kumar Prajapati
Keyword(s):  
Numerical Aperture ◽  
Effective Area ◽  
Confinement Loss ◽  
Performance Parameters ◽  
Material Loss ◽  
Crystal Fiber ◽  
Negative Dispersion ◽  
High Nonlinearity ◽  
Very High ◽  
Air Hole

Abstract In this manuscript we designed a circular photonic crystal fiber (PCF) having three rectangular holes filled with GaP in the core region, three air hole rings and one annular air ring in cladding region. We found highest negative dispersion for the 1.8µm pitch alongwith very low confinement loss at wavelength 1.55µm. This designed PCF offers high nonlinearity (39612 W-1km-1) and high negative dispersion (-6586 ps nm-1 km-1) alongwith zero confinement loss at 1.55µm wavelength. We also compared the proposed PCF with the previously published PCF structure and found that the nonlinearity and negative dispersion of the designed PCF are very high in comparison to circular air hole based PCF. Another performance parameters viz. birefringence, numerical aperture, effective area and effective material loss are also analyzed.

Ultra high birefringent dispersion flattened fiber in terahertz regime

2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Md. Selim Reza ◽  
Md. Ahasan Habib ◽  
Ibrahim Mustafa Mehedi ◽  
Md. Mottahir Alam ◽  
Shaikh Abdul Latif
Keyword(s):  
Effective Area ◽  
Confinement Loss ◽  
Thz Radiation ◽  
Transmission Characteristics ◽  
Material Loss ◽  
Crystal Fiber ◽  
Porous Core ◽  
Bending Loss ◽  
Polarization Maintaining ◽  
Core Fiber

AbstractIn the current study, a novel Zeonex based porous core photonic crystal fiber (PC-PCF) is presented for polarization-maintaining and dispersion flattened in the terahertz (THz) region. For minimizing the Effective Material Loss (EML), an array of three rectangular and six triangular air holes are surrounded by hexagonal-shaped cladding. Finite Element Method (FEM) is employed through Comsol V5.3a software to design and examine the essential features of the proposed porous core fiber which revealed that it has an extremely small EML of 0.04 cm−1 at 1.2 THz and has almost zero flattened dispersion of 0.8 ± 0.08 ps/THz/cm in 1.0–1.4 THz frequency spectrum. Moreover, the optimum designing parameters offer an extremely high value of birefringence (0.043 at 1.2 THz). Besides, other major features notably bending loss, effective area, and confinement loss are also found to be precise and relatively low. For effective, adaptable and fitting transmission characteristics, this type of design would lay the foundations for broadband THz radiation wide variety of usage in the THz regime.

Theoretical Assessment of a Porous Core Photonic Crystal Fiber for Terahertz Wave Propagation

2018 ◽  
Vol 0 (0) ◽  
Author(s):  
Izaddeen Kabir Yakasai ◽  
Atta Rahman ◽  
Pg Emeroylariffion Abas ◽  
Feroza Begum
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Bulk Material ◽  
Single Mode ◽  
Confinement Loss ◽  
Design Parameters ◽  
Terahertz Waves ◽  
Material Loss ◽  
Crystal Fiber ◽  
Porous Core

AbstractA porous core photonic crystal fiber (PCF) for transmitting terahertz waves is reported and characterized using finite element method. It is shown that by enveloping an octagonal core consisting of only circular air holes in a hexagonal cladding, it is possible to attain low effective material loss that is 73.8% lower than the bulk material absorption loss at 1.0 THz operating frequency. Moreover, a low confinement loss of 7.53×10–5 cm−1 and dispersion profile of 1.0823±0.06 ps/THz/cm within 0.7–1 THz are obtained using carefully selected geometrical design parameters. Other guiding properties such as single-mode operation, bending loss, and effective area are also investigated. The structural design of this porous core PCF is comparatively simple since it contains noncomplex lattices and circular shaped air holes; and therefore, may be implemented using existing fabrication techniques. Due to its auspicious guiding properties, the proposed fiber may be used in single mode terahertz imaging and other short distance terahertz applications.

scholarly journals Theoretical Considerations of Photonic Crystal Fiber with All Uniform-Sized Air Holes for Liquid Sensing

Photonics ◽  
2021 ◽  
Vol 8 (7) ◽  
pp. 249
Author(s):  
Abdul Mu’iz Maidi ◽  
Pg Emeroylarffion Abas ◽  
Pg Iskandar Petra ◽  
Shubi Kaijage ◽  
Nianyu Zou ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Nonlinear Coefficient ◽  
Numerical Aperture ◽  
Relative Sensitivity ◽  
Effective Area ◽  
Confinement Loss ◽  
Crystal Fiber ◽  
Sensing Applications ◽  
Liquid Sensing

A novel liquid-infiltrated photonic crystal fiber model applicable in liquid sensing for different test liquids—water, ethanol and benzene—has been proposed. One core hole and three air hole rings have been designed and a full vector finite element method has been used for numerical investigation to give the best results in terms of relative sensitivity, confinement loss, power fraction, dispersion, effective area, nonlinear coefficient, numerical aperture and V-Parameter. Specially, the assessed relative sensitivities of the proposed fiber with water, ethanol and benzene are 94.26%, 95.82% and 99.58%, respectively, and low confinement losses of 1.52 × 10−11 dB/m with water, 1.21 × 10−12 dB/m with ethanol and 6.01 × 10−16 dB/m with benzene, at 1.0 μm operating wavelength. This novel PCF design is considered simple and can be easily fabricated for practical use, and the assessed waveguide properties has determined the potential applicability in real liquid sensing applications.

scholarly journals Ultra low loss and dispersion flattened microstructure fiber for terahertz applications

2020 ◽  
Vol 1 (3) ◽  
pp. 1-5 ◽  
Author(s):  
Ahasan Habib
Keyword(s):  
Hexagonal Lattice ◽  
Real Life ◽  
Single Mode ◽  
Effective Area ◽  
Light Signal ◽  
Confinement Loss ◽  
Material Loss ◽  
Microstructure Fiber ◽  
Porous Core ◽  
Terahertz Applications

In this paper, a rectangular core hexagonal lattice porous core photonic crystal fiber (PC-PCF) is reported for effectively guiding the terahertz light signal. Finite element method with circular perfectly matched layer boundary condition is employed to find out the propagation characteristics of this proposed porous core fiber. Extensive simulation results of that microstructure fiber over wide frequency range shows that very low effective material loss of 0.035 cm-1, large effective area of 1.79×10-7 m2 and high core power fraction of 36% can be obtained simultaneously. In addition, for same designing condition nearly zero flattened dispersion of 0.46 ± 0.07 ps/THz/cm can be achieved over 600 GHz frequency band in terahertz range. Furthermore, other important parameters like single mode operation, confinement loss and bending loss are also investigated rigorously for the proposed fiber. The excellent results of this optical waveguide will pave the way to implement it in various real life terahertz applications.

Zeonex-based Tetra-rectangular Core-photonic Crystal Fiber for NaCl Detection

2020 ◽  
Vol 10 ◽  
Author(s):  
Abdullah Al-Mamun Bulbul ◽  
Md. Bellal Hossain ◽  
Rahul Dutta ◽  
Mahadi Hassan
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Effective Area ◽  
Confinement Loss ◽  
Polarization Direction ◽  
Material Loss ◽  
Crystal Fiber ◽  
Sensor Model ◽  
Proposed Model ◽  
Peak Sensitivity

Introduction: This paper demonstrates the design of a sensor model for the detection of Sodium Chloride (NaCl) in an effective and efficient manner. Photonic Crystal Fiber (PCF) has been used to design this sensor model. Objective: Using Comsol Multiphysics software, the sensor model has been implemented and simulated to carry out an indepth analysis of the sensing performance of the proposed model. Method: The confinement loss, effective material loss, effective area, birefringence, and relative sensitivity has been analyzed to estimate the sensing efficiency of this model. The sensor performance has been analyzed for five different concentrations of NaCl. Results: From the analysis, it is found that for all the analytes, confinement loss maintains a moderate value for the frequency band ranging from 0.9 to 1.2 THz. However, it approaches absolute zero immediately after 1.2 THz. The sensor model results in a high effective area, which is highly desirable for every PCF. It shows 3.78 × 105 , 3.77 × 105 , 3.76 × 105 , 3.75 × 105 , and 3.743 × 105 μm 2 effective areas for 0%, 20%, 40%, 60% and 80% NaCl respectively at 1.4 THz. The effective material loss for this model is about 3.7×10-3 , 3.63×10-3 , 3.68×10 -3 , 3.672×10-3 and 3.652×10-3 cm -1 for 80%, 60%, 40%, 20% and 0% NaCl respectively at 1.4 THz. Birefringence is also high for the proposed model . The values of birefringence are approximately 0.002, 0.0018, 0.0017, 0.0016 and 0.0015 at 1.4 THz for 0%, 20%, 40%, 60% and 80% NaCl respectively. In addition to the above positive outcomes, the sensor model exhibits high sensitivity for both x and y polarization. The peak sensitivity of this sensor is 91.5%, 91.42%, 91.34%, 91.25% and 91.10% in x polarization direction whereas the peak sensitivity is 91.70%, 91.60%, 91.49%, 91.40% and 91.25% in y polarization direction for 80%, 60%, 40%, 20% and 0% NaCl respectively at 1.8 THz. The value of sensitivity is above 90% at 1.4 THz for all the five concentrations of NaCl. Conclusion: The analyzed optical properties signify the higher efficiency and effectiveness of the sensor model in the detection of NaCl.

scholarly journals Design of Honeycomb Shaped Spectroscopy based Biosensor for the Detection of Tuberculosis Cells

2021 ◽  
Author(s):  
Tarunnum Parvin ◽  
M S Zobaer ◽  
Kawsar Ahmed ◽  
Francis Minhthang Bui ◽  
Sumaiya Akhtar Mitu ◽  
...  
Keyword(s):  
Hexagonal Lattice ◽  
Numerical Aperture ◽  
High Sensitivity ◽  
Effective Area ◽  
Spot Size ◽  
Confinement Loss ◽  
Optical Parameters ◽  
Circular Shape ◽  
Vector Finite Element ◽  
Background Material

Abstract A novel compact honeycomb spectroscopic-based PCF sensor for the detection of tuberculosis cells is proposed. A circular shape core area and tightly bound hexagonal shape air holes in the cladding area are designed for the suggested structure that exhibits ultra-high sensitivity up to 99.99% and very low loss of order 10-11 dB/m. The optical parameters such as effective area (Aeff), V-parameter or normalized frequency (Veff), spot- size (Weff), numerical aperture, along quality factor of beam have been exhibited and numerically observed. The wavelength operating region is specified as 1.2 μm to 2.5 μm. The guiding properties of this suggested tuberculosis sensor is computed with the full vector finite element method (FV-FEM) in the environment of COMSOL Multiphysics (Version5.3) for the calculation of numerical analysis. Circular shape perfectly matched layer (PML) and hexagonal lattice PCF sensor using silica as a background material is successfully designed to increase the sensitivity response compare to the prior works. Moreover, during the entire operating wavelength presented sensor achieves a single modality. With excellent sensitivity response and very low confinement loss, this proposed sensor doubtfully proves its prominent role to detect tuberculosis cells.

scholarly journals Low Effective Material Loss TOPAS Based Single-Mode Photonic Crystal Fiber with High Core Power Fraction in the THz Waveguiding

2021 ◽  
Author(s):  
Selim Hossain ◽  
Shuvo Sen
Keyword(s):  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Single Mode ◽  
Effective Area ◽  
Confinement Loss ◽  
Long Distance ◽  
Material Loss ◽  
Scattering Loss ◽  
Crystal Fiber ◽  
Different Types

Abstract In this study, five layers of hexagonal cladding and two elliptical air holes based on photonic crystal fiber are discussed highly for many communication areas by decreasing different types of losses such as effective material loss (EML), scattering loss, and confinement loss in the terahertz (THz) waveguiding. Our suggested fiber (H-PCF) and all simulation results are obtained with the finite element method (FEM) and the perfectly matched layer (PML) boundary conditions based COMSOL Multiphysics software have been used to design in the THz region. After investigating all the graphical results, this optical communication-related H-PCF fiber discloses an extremely low effective material loss (EML) of 0.0184 cm−1, with an effective area of 7.07×10-8 m2 and flow of power in the core region of 88% at 1 terahertz (THz). Here, other simulation parameters such as confinement loss, scattering loss, and V-parameter are also presented with a proper graph. So, we can easily say that the reported H-PCF fiber is strongly appropriate for different types of short and long-distance communication applications in the terahertz (THz) wave pulse region.

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

2018 ◽  
Vol 0 (0) ◽  
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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