Highly birefringent photonic crystal fiber with D-shaped air holes for terahertz (THz) application

Abstract A new type of high birefringence terahertz (THz) band photonic crystal fiber (PCF) is proposed. D-shaped air holes are introduced into the core of the PCF and the cladding near the core. Some important parameters of this waveguide were researched in the range of 0.6–1.2 THz. The simulation results show that the proposed fiber has a high birefringence of 0.0425 at 0.7 THz. In addition, the confinement loss and the effective mode area are respectively 6.63 × 10−7 dB/m and 0.77 × 105 μm2, when the operating frequency is 1 THz and the high birefringence of 0.04 is maintained. At the same time, very low bending loss and near zero flat positive dispersion are obtained. And has single-mode operating characteristics in the entire research frequency range. The PCF structure will provide new solutions for the application of THz waves and the design of THz waveguides.

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Sensing of Illegal Drugs by Using Photonic Crystal Fiber in Terahertz Regime

Journal of Optical Communications ◽

10.1515/joc-2019-0291 ◽

2020 ◽

Vol 0 (0) ◽

Cited By ~ 1

Author(s):

Shaymaa Riyadh Tahhan ◽

Hadeel K. Aljobouri

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Relative Sensitivity ◽

Confinement Loss ◽

Crystal Fiber ◽

The Core ◽

Stimulant Abuse ◽

Element Simulation ◽

Effective Mode Area ◽

Mode Area

AbstractStimulant abuse enhances dopamine release, thereby causing increased excitation. Any extent of stimulant abuse can considerably harm the user. Thus, methods of detecting stimulants must be precise, accurate, and reliable. A novel terahertz (THz) photonic crystal fiber with a Topas substrate is designed and rigorously investigated for detecting liquid amphetamine, cocaine, and ketamine. The fiber structure has a pentagonal shape and comprises circular air holes in the core and cladding spatial extents. As shown in finite element simulation, the proposed fiber yields a high relative sensitivity of approximately 80 % when any of the liquid stimulants is infiltrated in the core air holes. At 1 THz operating frequency, the proposed fiber produces a large effective mode area, negligible confinement loss, and extremely low bending and effective material losses. Other THz waveguiding properties, such as core power fraction and total loss, are also studied. Lastly, a positive and negative 2 % fabrication tolerance is set to ensure seamless potential practical realization of the fiber.

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Large Mode Area Photonic Crystal Fiber with Low Dispersion and Confinement Loss for Terahertz Wave Guiding

Advanced Energy Conversion Materials ◽

10.37256/aecm.122020321 ◽

2020 ◽

pp. 80-86

Author(s):

Chao Liu ◽

Liying Wang ◽

Jianwei Wang ◽

Sinuo An ◽

Famei Wang ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Single Mode ◽

Terahertz Wave ◽

Confinement Loss ◽

Wave Band ◽

Large Mode Area ◽

Crystal Fiber ◽

Mode Area ◽

Low Dispersion

A photonic crystal fiber (PCF) made of the cyclic-olefin copolymer (COC) with low dispersion and confinement loss, large-mode-area, and single-mode transmission for terahertz wave guiding is described. The characteristics of the PCF in the terahertz range are simulated and analyzed by the full-vector finite element method (FEM). The effects of the structural parameters on the performance of the terahertz PCF are also investigated. The effective mode field area of the PCF is as large as 1.22084 × 107 μm2 at a wavelength of 1,000 μm and a flat dispersion of 0.07669 ± 0.33258 ps/nm/km is obtained. A much lower confinement loss of 6.0253 × 10-16 dB/m is achieved. The single mode transmission over the entire terahertz wave band is described.

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Improving of high birefringence photonic crystal fiber with low confinement loss using small elliptical air holes in the core region

Journal of Modern Optics ◽

10.1080/09500340.2014.994683 ◽

2014 ◽

Vol 62 (7) ◽

pp. 588-592 ◽

Cited By ~ 2

Author(s):

A. Sonne ◽

A. Ouchar

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Core Region ◽

Confinement Loss ◽

High Birefringence ◽

Crystal Fiber ◽

The Core

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Large mode area single mode photonic crystal fiber with ultra-low bending loss

Optik ◽

10.1016/j.ijleo.2020.165556 ◽

2021 ◽

Vol 229 ◽

pp. 165556

Author(s):

Yu-lai She ◽

Wen-tao Zhang ◽

Shan Tu ◽

Guoling Liang

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Single Mode ◽

Large Mode Area ◽

Crystal Fiber ◽

Bending Loss ◽

Mode Area

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

Journal of Optical Communications ◽

10.1515/joc-2018-0206 ◽

2018 ◽

Vol 0 (0) ◽

Cited By ~ 4

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.

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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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Efficient Photonic Crystal Fiber Design for Higher OAM Modes with Low Loss Towards Next Generation THz Communication

10.21203/rs.3.rs-845789/v1 ◽

2021 ◽

Author(s):

Bibhatsu Kuiri ◽

Bubai Dutta ◽

Nilanjana Sarkar ◽

Saikat Santra ◽

Paulomi Mandal ◽

...

Keyword(s):

Photonic Crystal ◽

Photonic Crystal Fiber ◽

Confinement Loss ◽

Solid Core ◽

Low Loss ◽

Crystal Fiber ◽

Fiber Design ◽

Effective Mode Area ◽

Mode Purity ◽

Mode Area

Abstract A newer and efficient solid core with air holes and ring based circular photonic crystal fiber (C-PCF) design is proposed, developed, and studied. The C-PCF structure with a ring core and three layers of air holes is developed to communicate terahertz frequency of the range of 1 THz to 3 THz. Finite element method (FEM) is used to optimize the position, shape and dimensions of air holes and refractive index (RI) of material for the proposed PCF design and check the efficiency to support different orbital angular momentum (OAM) modes for communication. Our novel designed C-PCF supports multiple stable modes with mode purity above 0.9. Confinement loss is in the range of 10-12 dB/cm, highest effective mode area in the order of 1 mm2 is achieved in the investigated study for 3 THz transmission. The study observes that the performance of PCF is strongly dependent on RI of core and cladding.

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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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