Showing posts with label
plasmonic terahertz waveguide.
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Showing posts with label
plasmonic terahertz waveguide.
Show all posts
https://link.springer.com/article/10.1140%2Fepjd%2Fe2017-70223-y
In this paper, a single-mode graphene loaded double ridge plasmon waveguide (GDRW) with long propagation length and strong mode confinement is proposed. The characteristics of the guided modes are investigated in detail, and tunable single-mode transmission with good performance can be realized either by changing the Fermi energy level or by optimizing the key structural parameters. High figures of merit and much lower crosstalk are obtained due to the dramatically suppressed interference between two parallel placed GDRWs, enabling thereby more tightly stacking in terahertz integrated circuits. Further investigation on fabrication errors, such as the horizontal misalignment of the two symmetric ridges, fabrication distortion of rectangular ridges, and variation of ridge tip curvature radius, indicates that the proposed structure has enough fabrication error tolerance. The results are greatly expected to facilitate the application of high-density terahertz integrated circuits.
Rezaei, M,
; Rasekh, P. ; Safian, R.
Mohsen Rezaei is with the Computer Engineering Department, Isfahan University of Technology, Isfahan, Iran, 84156. (email: m.r.rezaei@ieee.org
http://ieeexplore.ieee.org/xpl/articleDetails.jsp?reload=true&arnumber=7169535&sortType%3Dasc_p_Sequence%26filter%3DAND%28p_IS_Number%3A4581641%29%26rowsPerPage%3D50
Using finite element method, we investigated a hybrid plasmonic terahertz waveguide with an additional stripe with a frequency of about f = 3 THz. The structure consisted of a semiconductor stripe located at the center of the gap between a five-layer graphene and a high-index dielectric ridge which were all placed on a low-index dielectric substrate. A properlysized stripe helps the power ratio inside the gap to considerably increase, and the normalized mode area to improve greatly as well. A power confinement ratio of 0.65 and a normalized mode area of 0.03 were obtained. This shows respective improvements of 30% and 72% in comparison to conventional waveguides. This structure also provides a good propagation length of about 820 μm
