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Wedge hybrid plasmonic THz waveguide with long propagation length and ultra-small deep-subwavelength mode area.

Gui C, Wang J - Sci Rep (2015)

Bottom Line: It features long propagation length and ultra-small deep-subwavelength mode confinement.When choosing the diameter of Si nanowire cylinder, a smaller diameter (e.g. 10 μm) is preferred to achieve longer L and higher FoM, while a larger diameter (e.g. 60 μm) is favorable to obtain smaller Aeff/A0 and higher FoM.We further study the impacts of possible practical fabrication errors on the mode properties.

View Article: PubMed Central - PubMed

Affiliation: Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China.

ABSTRACT
We present a novel design of wedge hybrid plasmonic terahertz (THz) waveguide consisting of a silicon (Si) nanowire cylinder above a triangular gold wedge with surrounded high-density polyethylene as cladding. It features long propagation length and ultra-small deep-subwavelength mode confinement. The mode properties of wedge hybrid plasmonic THz waveguide are comprehensively characterized in terms of propagation length (L), normalized mode area (Aeff/A0), figure of merit (FoM), and chromatic dispersion (D). The designed wedge hybrid plasmonic THz waveguide enables an ultra-small deep-subwavelength mode area which is more than one-order of magnitude smaller compared to previous rectangular one. When choosing the diameter of Si nanowire cylinder, a smaller diameter (e.g. 10 μm) is preferred to achieve longer L and higher FoM, while a larger diameter (e.g. 60 μm) is favorable to obtain smaller Aeff/A0 and higher FoM. We further study the impacts of possible practical fabrication errors on the mode properties. The simulated results of propagation length and normalized mode area show that the proposed wedge hybrid plasmonic THz waveguide is tolerant to practical fabrication errors in geometry parameters such as misalignment in the horizontal direction, variation of wedge tip angle, and variation of wedge tip curvature radius.

No MeSH data available.


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(a) Propagation length (L) and (b) normalized mode area (Aeff/A0) vs. wedge tip curvature radius. The wedge tip angle is 100 deg, the diameter of Si nanowire cylinder is 40 μm, and the gap height is 1 μm.
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f7: (a) Propagation length (L) and (b) normalized mode area (Aeff/A0) vs. wedge tip curvature radius. The wedge tip angle is 100 deg, the diameter of Si nanowire cylinder is 40 μm, and the gap height is 1 μm.

Mentions: Another possible practical fabrication issue is the wedge tip which might not be sharp but round. So we also study the impacts of the variation of wedge tip curvature radius on the mode properties. Figure 7(a) show the propagation length and normalized mode area as a function of the wedge tip curvature radius under a wedge tip angle of 100 deg. With a large increase of the wedge tip curvature radius from 1 to 10 μm, one can see the increase of the propagation length from 233 to 374 mm and the increase of the normalized mode area from 1.86 × 10−3 and 5.43 × 10−3.


Wedge hybrid plasmonic THz waveguide with long propagation length and ultra-small deep-subwavelength mode area.

Gui C, Wang J - Sci Rep (2015)

(a) Propagation length (L) and (b) normalized mode area (Aeff/A0) vs. wedge tip curvature radius. The wedge tip angle is 100 deg, the diameter of Si nanowire cylinder is 40 μm, and the gap height is 1 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4496726&req=5

f7: (a) Propagation length (L) and (b) normalized mode area (Aeff/A0) vs. wedge tip curvature radius. The wedge tip angle is 100 deg, the diameter of Si nanowire cylinder is 40 μm, and the gap height is 1 μm.
Mentions: Another possible practical fabrication issue is the wedge tip which might not be sharp but round. So we also study the impacts of the variation of wedge tip curvature radius on the mode properties. Figure 7(a) show the propagation length and normalized mode area as a function of the wedge tip curvature radius under a wedge tip angle of 100 deg. With a large increase of the wedge tip curvature radius from 1 to 10 μm, one can see the increase of the propagation length from 233 to 374 mm and the increase of the normalized mode area from 1.86 × 10−3 and 5.43 × 10−3.

Bottom Line: It features long propagation length and ultra-small deep-subwavelength mode confinement.When choosing the diameter of Si nanowire cylinder, a smaller diameter (e.g. 10 μm) is preferred to achieve longer L and higher FoM, while a larger diameter (e.g. 60 μm) is favorable to obtain smaller Aeff/A0 and higher FoM.We further study the impacts of possible practical fabrication errors on the mode properties.

View Article: PubMed Central - PubMed

Affiliation: Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, Hubei, China.

ABSTRACT
We present a novel design of wedge hybrid plasmonic terahertz (THz) waveguide consisting of a silicon (Si) nanowire cylinder above a triangular gold wedge with surrounded high-density polyethylene as cladding. It features long propagation length and ultra-small deep-subwavelength mode confinement. The mode properties of wedge hybrid plasmonic THz waveguide are comprehensively characterized in terms of propagation length (L), normalized mode area (Aeff/A0), figure of merit (FoM), and chromatic dispersion (D). The designed wedge hybrid plasmonic THz waveguide enables an ultra-small deep-subwavelength mode area which is more than one-order of magnitude smaller compared to previous rectangular one. When choosing the diameter of Si nanowire cylinder, a smaller diameter (e.g. 10 μm) is preferred to achieve longer L and higher FoM, while a larger diameter (e.g. 60 μm) is favorable to obtain smaller Aeff/A0 and higher FoM. We further study the impacts of possible practical fabrication errors on the mode properties. The simulated results of propagation length and normalized mode area show that the proposed wedge hybrid plasmonic THz waveguide is tolerant to practical fabrication errors in geometry parameters such as misalignment in the horizontal direction, variation of wedge tip angle, and variation of wedge tip curvature radius.

No MeSH data available.


Related in: MedlinePlus