Design of terahertz fibers using polymer tube bundles and their guided mode and propagation loss analyses

2021 ◽  
Vol 480 ◽  
pp. 126465
Author(s):  
Hirohisa Yokota ◽  
Kenjiro Onuki ◽  
Yoh Imai
Keyword(s):  
Propagation Loss ◽  
Guided Mode ◽  
Tube Bundles ◽  
Polymer Tube

Subwavelength Terahertz Waveguide Using Negative Permeability Metamaterial

2009 ◽  
Vol 1182 ◽  
Author(s):  
Atsushi Ishikawa ◽  
Shuang Zhang ◽  
Dentcho A Genov ◽  
Guy Bartal ◽  
Xiang Zhang
Keyword(s):  
Optical Constants ◽  
Propagation Loss ◽  
Negative Permeability ◽  
Narrow Gap ◽  
Negative Group ◽  
Guided Mode ◽  
Core Width ◽  
Terahertz Waveguide ◽  
Device Applications ◽  
Group Velocities

AbstractWe propose a novel subwavelength terahertz (THz) waveguide using the magnetic plasmon polariton (MPP) mode guided by a narrow gap in a negative permeability metamaterial. Deep subwavelength wave-guiding (< λ/10) with a modest propagation loss (2.5 dB/λ) and group velocities down to c/21.8 is demonstrated in a straight waveguide, a 90-degree bend, and a splitter. The distinctive dispersions of the guided mode with positive and negative group velocities are explained analytically by considering the dispersive effective optical constants of the metamaterial. The proposed waveguiding system inherently has no cutoff for any core width and height, paving the way toward the deep subwavelength transport of THz waves for integrated THz device applications.

scholarly journals Femtosecond laser induced low propagation loss waveguides in a lead-germanate glass for efficient lasing in near to mid-IR

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Mamoona Khalid ◽  
George Y. Chen ◽  
Heike Ebendorff-Heidepreim ◽  
David G. Lancaster
Keyword(s):  
Femtosecond Laser ◽  
Propagation Loss ◽  
Laser Operation ◽  
Lead Germanate ◽  
Laser Applications ◽  
Germanate Glass ◽  
Guided Mode ◽  
Near Ir ◽  
Efficient Lasing ◽  
Index Contrast

AbstractTo support the growing landscape of near to mid-IR laser applications we demonstrate a range of low propagation loss femtosecond laser (FSL) written waveguides (WGs) that have achieved guided-mode laser operation in a rare earth (RE) doped lead-germanate glass. The WGs are fabricated in both the athermal and thermal FSL writing regimes using three different pulse repetition frequencies (PRF): 100 kHz (athermal); 1 MHz; and 5 MHz (thermal). The lasing capability of Yb3+ doped lead-germanate waveguides is verified in the near-IR. The refractive index contrast (∆n) for 100 kHz WGs is ~ 1 × 10–4, while for 5 MHz, ∆n increases to ~ 5 × 10–4. The WGs in the thermal regime are less effected by self-focusing and are larger in dimensions with reduced propagation losses. For the 1 MHz repetition rate thermal writing regime we report a low propagation loss WG (0.2 dB/cm) and demonstrate laser operation with slope efficiencies of up to ~ 28%.

HEAT AND MASS TRANSFER AND RESISTANCE CHARACTERISTICS OF EVAPORATIVE AIR COOLER WITH HIGH FINNED-TUBE BUNDLES

2018 ◽  
Vol 49 (17) ◽  
pp. 1705-1720 ◽  
Author(s):  
Qing Zhang ◽  
Xuesheng Wang ◽  
Weicheng Ruan ◽  
Qinzhu Chen ◽  
Zilong Liu
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Finned Tube ◽  
Tube Bundles ◽  
Air Cooler

Enhanced light trapping in Ge-on-Si-on-insulator photodetector by guided mode resonance effect

2018 ◽  
Vol 124 (5) ◽  
pp. 053101
Author(s):  
Zhi Liu ◽  
Jietao Liu ◽  
Buwen Cheng ◽  
Jun Zheng ◽  
Chuanbo Li ◽  
...  
Keyword(s):  
Light Trapping ◽  
Resonance Effect ◽  
Guided Mode ◽  
Guided Mode Resonance
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