Highly birefringent and low effective material loss microstructure fiber for THz wave guidance

2018 ◽  
Vol 423 ◽  
pp. 140-144 ◽  
Author(s):  
Md. Ahasan Habib ◽  
Md. Shamim Anower ◽  
Md. Rabiul Hasan
Keyword(s):  
Material Loss ◽  
Thz Wave ◽  
Microstructure Fiber

scholarly journals Low material loss and dispersion flattened fiber for single mode THz-wave transmission applications

2018 ◽  
Vol 11 ◽  
pp. 638-642 ◽  
Author(s):  
Bikash Kumar Paul ◽  
Md. Shadidul Islam ◽  
Shuvo Sen ◽  
Kawsar Ahmed ◽  
Muhammad Shahin Uddin
Keyword(s):  
Single Mode ◽  
Wave Transmission ◽  
Material Loss ◽  
Thz Wave

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.

scholarly journals Ultra-low material loss microstructure fiber for terahertz guidance

2017 ◽  
Vol 9 (2) ◽  
pp. 66 ◽  
Author(s):  
Md. Rabiul Hasan ◽  
S. Ali ◽  
S. A. Emi
Keyword(s):  
Single Mode ◽  
Terahertz Wave ◽  
Square Lattice ◽  
Ieee Photon ◽  
Low Loss ◽  
Material Loss ◽  
Quantum Cascade ◽  
Crystal Fiber ◽  
Microstructure Fiber ◽  
Porous Core

In this letter, we numerically demonstrate a hybrid-core microstructure fiber for low-loss terahertz guidance. Finite element method with circular perfectly matched layer boundary condition is applied to characterize the guiding properties. It is shown that by using a triangular-core inside a square lattice microstructure exhibits ultra-low effective material loss (EML) of 0.169 dB/cm and low confinement loss of 0.087 dB/cm at the operating frequency of 0.75 THz. We also discuss how other guiding properties including power fraction, single mode propagation and dispersion vary with changing of core diameter and operating frequencies. This low-loss microstructure fiber can be effectively used in numerous applications in the THz regime. Full Text: PDF ReferencesJ. J. Bai, J. N. Li, H. Zhang, H. Fang, S. J. Chang, "A porous terahertz fiber with randomly distributed air holes", Appl. Phys. B 103, 2 (2011). CrossRef S. Atakaramians, S. Afshar, B. M. Fischer, D. Abbott, T. M. Monro, "Porous fibers: a novel approach to low loss THz waveguides", Opt. Express 16, 12 (2008). CrossRef K. Wang, D. M. Mittleman, "Metal wires for terahertz wave guiding", Nature 432, 7015 (2004). CrossRef R. Islam, G. K. M. Hasanuzzaman, M. S. Habib, S. Rana, M. A. G. Khan, "Low-loss rotated porous core hexagonal single-mode fiber in THz regime", Opt. Fiber Technol. 24, (2015). CrossRef M. I. Hasan, S. M. A. Razzak, G. K. M. Hasanuzzaman, M. S.Habib, "Ultra-Low Material Loss and Dispersion Flattened Fiber for THz Transmission", IEEE Photon. Technol. Lett. 26, 23 (2014). CrossRef S. F. Kaijage, Z. Ouyang, X. Jin, "Porous-Core Photonic Crystal Fiber for Low Loss Terahertz Wave Guiding", IEEE Photon. Technol. Lett. 25, 15 (2013). CrossRef M. R. Hasan, M. A. Islam, A. A. Rifat, "A single mode porous-core square lattice photonic crystal fiber for THz wave propagation", J. Eur. Opt. Soc. Rapid Publ. 12, 1 (2016). CrossRef M. R. Hasan, M. A. Islam, M. S. Anower, S. M. A. Razzak, "Low-loss and bend-insensitive terahertz fiber using a rhombic-shaped core", Appl. Opt. 55, 30 (2016). CrossRef S. Ali et al. "Ultra-low loss THz waveguide with flat EML and near zero flat dispersion properties", in 9th Int. Conf. on Elect. and Comp. Eng., IEEE, (2016). CrossRef K. Nielsen, H. K. Rasmussen, A. J. Adam, P. C. Planken, O. Bang, P. U. Jepsen, "Bendable, low-loss Topas fibers for the terahertz frequency range", Opt. Express 17, 10 (2009). CrossRef A. W. Snyder, J. D. Love, Optical waveguide theory (London, Chapman & Hall 1983). DirectLink L. Vincetti, A. Polemi, in Antennas and Propagation Society International Symposium, IEEE (2009)G. P. Agrawal, Nonlinear fiber optics (Boston, Academic Press 1989). CrossRef B. S. Williams, "Terahertz quantum-cascade lasers", Nat. Photon. 1, 9 (2007). CrossRef H. W. Hubers et al. "Terahertz quantum cascade laser as local oscillator in a heterodyne receiver", Opt. Express 13, 15 (2005). CrossRef

Extremely Low Loss of Photonic Crystal Fiber for Terahertz Wave Propagation in Optical Communication Applications

2020 ◽  
Vol 41 (4) ◽  
pp. 393-401 ◽  
Author(s):  
Fahad Ahmed ◽  
Subrata Roy ◽  
Bikash Kumar Paul ◽  
Kawsar Ahmed ◽  
Ali Newaz Bahar
Keyword(s):  
Wave Propagation ◽  
Photonic Crystal ◽  
Photonic Crystal Fiber ◽  
Fem Simulation ◽  
Effective Area ◽  
Low Loss ◽  
Material Loss ◽  
Scattering Loss ◽  
Thz Wave ◽  
Crystal Fiber

AbstractAn enormously low loss symmetrical hybrid decagonal porous core spiral photonic crystal fiber (SH-PCF) has been proposed for terahertz (THz) wave guiding. The modal characteristics of the fiber and its mathematical analysis have been numerically completed using a full-vector finite element method (FEM). Simulation results show an ultra-low material loss of 0.0167 cm−1 and large effective area 1.95×106 µm2 which is 91.6 % of bulk absorption material loss at controlling frequency f=1.0 THz with a core porosity 42 %. Additionally, proposed structure establishes the comparatively higher core power fraction maintaining lower scattering loss about 1.8×10−15 dB/cm at the same operating frequency. It promises the aforementioned advantages for efficient THz wave propagation.

Social Cost and Material Loss: The Dakota Access Pipeline

2018 ◽  
Author(s):  
Carla Fredericks ◽  
Mark Meaney ◽  
Nick Pelosi ◽  
Kathleen Finn
Keyword(s):  
Social Cost ◽  
Material Loss
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