Limits...
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) and normalized mode area (Aeff/A0), (b) figure of merit (FoM), and (c) chromatic dispersion vs. frequency from 0.1 to 2 THz. The wedge tip angle is 100 deg, the diameter of Si nanowire cylinder is 40 μm, and the gap height is 0.2 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4496726&req=5

f4: (a) Propagation length (L) and normalized mode area (Aeff/A0), (b) figure of merit (FoM), and (c) chromatic dispersion vs. frequency from 0.1 to 2 THz. The wedge tip angle is 100 deg, the diameter of Si nanowire cylinder is 40 μm, and the gap height is 0.2 μm.

Mentions: We also evaluate the propagation length (L), normalized mode area (Aeff/A0), figure of merit (FoM) and chromatic dispersion (D) of the proposed wedge hybrid plasmonic THz waveguide as a function of the frequency from 0.1 to 2THz under optimized wedge tip angle of 100 deg and diameter of the Si nanowire cylinder of 40 μm. As shown in Fig. 4(a), the propagation length and figure of merit decreases first and then increases while the normalized mode area increases as increasing the frequency. The propagation length changes between 110.9 and 2698 mm, the normalized mode area increases from 3.45 × 10−4 to 2.02 × 10−3, and the figure of merit varies between 1.52 × 104 and 4.88 × 104 with the frequency changing from 0.1 to 2 THz. As shown in Fig. 4(c), one can see that the chromatic dispersion increases with the increase of frequency. An ultra-low chromatic dispersion varying from −1.3 × 10−4 to −12.3 ps/nm/km is achieved when changing the frequency from 0.1 to 2 THz.


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 normalized mode area (Aeff/A0), (b) figure of merit (FoM), and (c) chromatic dispersion vs. frequency from 0.1 to 2 THz. The wedge tip angle is 100 deg, the diameter of Si nanowire cylinder is 40 μm, and the gap height is 0.2 μm.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

f4: (a) Propagation length (L) and normalized mode area (Aeff/A0), (b) figure of merit (FoM), and (c) chromatic dispersion vs. frequency from 0.1 to 2 THz. The wedge tip angle is 100 deg, the diameter of Si nanowire cylinder is 40 μm, and the gap height is 0.2 μm.
Mentions: We also evaluate the propagation length (L), normalized mode area (Aeff/A0), figure of merit (FoM) and chromatic dispersion (D) of the proposed wedge hybrid plasmonic THz waveguide as a function of the frequency from 0.1 to 2THz under optimized wedge tip angle of 100 deg and diameter of the Si nanowire cylinder of 40 μm. As shown in Fig. 4(a), the propagation length and figure of merit decreases first and then increases while the normalized mode area increases as increasing the frequency. The propagation length changes between 110.9 and 2698 mm, the normalized mode area increases from 3.45 × 10−4 to 2.02 × 10−3, and the figure of merit varies between 1.52 × 104 and 4.88 × 104 with the frequency changing from 0.1 to 2 THz. As shown in Fig. 4(c), one can see that the chromatic dispersion increases with the increase of frequency. An ultra-low chromatic dispersion varying from −1.3 × 10−4 to −12.3 ps/nm/km is achieved when changing the frequency from 0.1 to 2 THz.

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