tapered waveguide
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Author(s):  
Eman Mohamed Eldesouki ◽  
Khalid Mustafa Ibrahim ◽  
Ahmed Mohmed Attiya

This paper focuses on a common drawback in electromagnetic numerical computer aided design computer aided design (CAD) tools: high frequency structure simulator (HFSS), computer simulation technology (CST) and FEKO, where the excitation by using a wave-port below and close to the cutoff frequency has unreliable values for the reflection coefficient. An example for such problem is presented in the design of a dual horn antenna fed by two different waveguide sections. To overcome this numerical error in the results of these CAD tools, a tapered waveguide section is used in the simulation as an excitation mechanism to the feeding waveguide. The cross section of the input port at this tapered waveguide section is designed to have a cutoff frequency smaller than the lowest frequency under investigation for the original problem. Then, by extracting the effect of the tapered section from the obtained reflection coefficient, it would be possible to obtain the reflection coefficient of the original problem.


2021 ◽  
pp. 1-11
Author(s):  
N. A. Mahadzir ◽  
A. Amphawan ◽  
T. Masunda ◽  
P. S. Menon ◽  
A. Jalar ◽  
...  

Sensors ◽  
2021 ◽  
Vol 21 (15) ◽  
pp. 5017
Author(s):  
Tayebeh Sahraeibelverdi ◽  
L. Jay Guo ◽  
Hadi Veladi ◽  
Mazdak Rad Malekshahi

Ring resonators are well-known optical biosensors thanks to their relatively high Q-factor and sensitivity, in addition to their potential to be fabricated in large arrays with a small footprint. Here, we investigated the characteristics of a polymer ring resonator with a partially tapered waveguide for Biomedical Sensing. The goal is to develop a more sensitive biosensor with an improved figure of merit. The concept is more significant field interaction with the sample under test in tapered segments. Waveguide width is hereby gradually reduced to half. Sensitivity improves from 84.6 to 101.74 [nm/RIU] in a relatively small Q-factor reduction from 4.60 × 103 for a strip waveguide to 4.36 × 103 for a π/4 partially tapered one. After the study, the number of tapered parts from zero to fifteen, the obtained figure of merit improves from 497 for a strip ring to 565 for a π/4 tapered ring close to six tapered ones. Considering the fabrication process, the three-tapered one is suggested. The all-polymer material device provides advantages of a low-cost, disposable biosensor with roll-to-roll fabrication compatibility. This design can also be applied on silicon on isolator, or polymer on silicon-based devices, thereby taking advantage of a higher Q-factor and greater sensitivity.


Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Vladimir A. Zenin ◽  
Sergey I. Bozhevolnyi

Abstract Nanofocusing, the term coined by Mark Stockman, has been observed in many different tapered waveguide configurations, demonstrating the possibility for optical modes to be efficiently delivered to and concentrated into nanoscale regions far beyond the diffraction limit in dielectric media. Strong and broadband local field enhancement and slowdown effects associated with the nanofocusing have been exploited for enhancing linear and nonlinear optical phenomena and reaching out to a broad spectrum of diverse applications, from electron generation to water vaporization. Starting with the historical background, we carefully elaborate on the basic concepts and mechanisms involved. We then provide examples of the latest developments in this exciting quest for bringing the fundamental physical phenomenon of nanofocusing into the realm of practical applications in modern nanotechnology.


Author(s):  
Heike Christopher ◽  
Anissa Zeghuzi ◽  
Andreas Klehr ◽  
Jan-Philipp Koester ◽  
Hans Wenzel ◽  
...  

2021 ◽  
Vol 29 (6) ◽  
pp. 8430
Author(s):  
Menghui He ◽  
Jiafu Zeng ◽  
Xian Zhang ◽  
Xiaosong Zhu ◽  
Chengbin Jing ◽  
...  

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