Optimal design of flat-gain wide-band fiber Raman amplifiers

2002 ◽  
Vol 20 (2) ◽  
pp. 250-254 ◽  
Author(s):  
V.E. Perlin ◽  
H.G. Winful
Keyword(s):  
Optimal Design ◽  
Wide Band ◽  
Raman Amplifiers ◽  
Flat Gain

Optimal design of flat-gain and flat-noise wide-band fiber Raman amplifiers

2009 ◽  
Author(s):  
Lina Yu ◽  
Yanbiao Liao ◽  
Min Zhang ◽  
Shurong Lai
Keyword(s):  
Optimal Design ◽  
Wide Band ◽  
Raman Amplifiers ◽  
Flat Gain

Double-pass erbium-doped zirconia fiber amplifier for wide-band and flat-gain operations

2011 ◽  
Vol 43 (7) ◽  
pp. 1279-1281 ◽  
Author(s):  
S.W. Harun ◽  
M.C. Paul ◽  
N.A.D. Huri ◽  
A. Hamzah ◽  
S. Das ◽  
...  
Keyword(s):  
Wide Band ◽  
Fiber Amplifier ◽  
Double Pass ◽  
Erbium Doped ◽  
Zirconia Fiber ◽  
Flat Gain

scholarly journals Wide-angle, wide-band, polarization-insensitive metamaterial absorber for thermal energy harvesting

2020 ◽  
Vol 10 (1) ◽  
Author(s):  
Ahmed Elsharabasy ◽  
Mohamed Bakr ◽  
M. Jamal Deen
Keyword(s):  
Optimal Design ◽  
Energy Harvesting ◽  
Thermal Energy ◽  
Near Field ◽  
Wide Band ◽  
Design Parameters ◽  
Perfect Absorber ◽  
Split Ring ◽  
Ir Radiation ◽  
Thermal Energy Harvesting

Abstract We propose a wide-band metamaterial perfect absorber (MPA), using the coupling in the near-field of a quadruple split-ring resonator concentric with crossed ellipses. We designed the MPA with a metal–insulator-metal (MIM) structure for use in thermal energy harvesting. A gradient-based optimization approach was carried out to maximize the absorption of infrared (IR) radiation around 10 μm. Owing to the near-field coupling of resonators with optimal design parameters, the peaks of the absorption responses approach each other, thus broadening the overall bandwidth with almost unity absorptivity. The proposed design has a resonance at 10 μm resulting from magnetic polaritons (MPs) and thus maintains high absorption above 99% up to a range of incident-angles greater than 60° and exhibits a polarization-free behavior due to symmetry. When the optimal design was numerically examined to fabrication tolerances, it showed negligible sensitivities in the absorptivity with respect to design parameters. The strong electric field enhancement inside the split-ring gaps and between the ends of the cross arms and the surrounding ring enables designing MIM diodes to rectify the harvested thermal radiations at 288 K. MIM diodes can be built by the deposition of thin insulators to sit in these gaps. The MIM diode and MPA work together to harvest and rectify the incident IR radiation in a manner similar to the operation of rectennas. The MPA outperforms the traditional nano-antennas in impedance matching efficiency because of its higher resistance. Also, its dual-polarization reception capability doubles the rectenna efficiency. Our proposed MPA retained absorptivity more than 99% when coupled with MIM diodes whose resistances are in the range of 500 Ω–1 MΩ.

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