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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.


Related in: MedlinePlus

(a) Propagation length (L), (b) normalized mode area (Aeff/A0), and (c) figure of merit (FoM) vs. diameter of Si nanowire cylinder (d) under different gap heights of the wedge hybrid THz waveguide. The wedge tip angle is 100 deg.
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f3: (a) Propagation length (L), (b) normalized mode area (Aeff/A0), and (c) figure of merit (FoM) vs. diameter of Si nanowire cylinder (d) under different gap heights of the wedge hybrid THz waveguide. The wedge tip angle is 100 deg.

Mentions: Figure 3 shows propagation length (L), normalized mode area (Aeff/A0) and figure of merit (FoM) of wedge hybrid plasmonic THz waveguide as a function of the diameter of Si nanowire cylinder under optimized tip angle of 100 deg and different gap height of 0.5, 1, 2, 3, 4, 5 μm, respectively. With the increase of diameter of Si nanowire cylinder, the L decreases first and then increases slightly while the Aeff/A0 decreases. Thus the FoM decreases first and then increases. According to different requirements, one may choose different values of diameter. That is, a smaller diameter (e.g. 10 μm) is preferred when expecting longer L and higher FoM, while a larger diameter (e.g. 60 μm) is favorable when requiring smaller Aeff/A0 and higher FoM.


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), (b) normalized mode area (Aeff/A0), and (c) figure of merit (FoM) vs. diameter of Si nanowire cylinder (d) under different gap heights of the wedge hybrid THz waveguide. The wedge tip angle is 100 deg.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f3: (a) Propagation length (L), (b) normalized mode area (Aeff/A0), and (c) figure of merit (FoM) vs. diameter of Si nanowire cylinder (d) under different gap heights of the wedge hybrid THz waveguide. The wedge tip angle is 100 deg.
Mentions: Figure 3 shows propagation length (L), normalized mode area (Aeff/A0) and figure of merit (FoM) of wedge hybrid plasmonic THz waveguide as a function of the diameter of Si nanowire cylinder under optimized tip angle of 100 deg and different gap height of 0.5, 1, 2, 3, 4, 5 μm, respectively. With the increase of diameter of Si nanowire cylinder, the L decreases first and then increases slightly while the Aeff/A0 decreases. Thus the FoM decreases first and then increases. According to different requirements, one may choose different values of diameter. That is, a smaller diameter (e.g. 10 μm) is preferred when expecting longer L and higher FoM, while a larger diameter (e.g. 60 μm) is favorable when requiring smaller Aeff/A0 and higher FoM.

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