Terahertz surface plasmon waveguide based on a one-dimensional array of silicon pillars
We experimentally demonstrate a three-dimensional plasmonic terahertz waveguide by lithographically patterning an array of sub-wavelength pillars on a silicon substrate. Doped silicon can exhibit conductive properties at terahertz frequencies, making it a convenient substitute for conventional metal...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2013-01-01
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| Series: | New Journal of Physics |
| Online Access: | https://doi.org/10.1088/1367-2630/15/8/085031 |
| _version_ | 1797751353544540160 |
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| author | Gagan Kumar Shanshan Li Mohammad M Jadidi Thomas E Murphy |
| author_facet | Gagan Kumar Shanshan Li Mohammad M Jadidi Thomas E Murphy |
| author_sort | Gagan Kumar |
| collection | DOAJ |
| description | We experimentally demonstrate a three-dimensional plasmonic terahertz waveguide by lithographically patterning an array of sub-wavelength pillars on a silicon substrate. Doped silicon can exhibit conductive properties at terahertz frequencies, making it a convenient substitute for conventional metals in plasmonic devices. However, the surface wave solution at a doped silicon surface is usually poorly confined and lossy. Here we demonstrate that by patterning the silicon surface with an array of sub-wavelength pillars, the resulting structure can support a terahertz surface mode that is tightly confined in both transverse directions. Further, we observe that the resonant behavior associated with the surface modes depends on the dimensions of the pillars, and can be tailored through control of the structural parameters. We experimentally fabricated devices with different geometries, and characterized the performance using terahertz time-domain spectroscopy. The resulting waveguide characteristics are confirmed using finite element numerical simulations, and we further show that a simple one-dimensional analytical theory adequately predicts the observed dispersion relation. |
| first_indexed | 2024-03-12T16:48:13Z |
| format | Article |
| id | doaj.art-16c107bcd9d04ad6872304228f83dc70 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:48:13Z |
| publishDate | 2013-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-16c107bcd9d04ad6872304228f83dc702023-08-08T11:28:20ZengIOP PublishingNew Journal of Physics1367-26302013-01-0115808503110.1088/1367-2630/15/8/085031Terahertz surface plasmon waveguide based on a one-dimensional array of silicon pillarsGagan Kumar0Shanshan Li1Mohammad M Jadidi2Thomas E Murphy3Institute for Research in Electronics and Applied Physics, University of Maryland , College Park, MD 20742, USADepartment of Electrical and Computer Engineering, University of Maryland , College Park, MD 20742, USADepartment of Electrical and Computer Engineering, University of Maryland , College Park, MD 20742, USAInstitute for Research in Electronics and Applied Physics, University of Maryland , College Park, MD 20742, USA; Department of Electrical and Computer Engineering, University of Maryland , College Park, MD 20742, USAWe experimentally demonstrate a three-dimensional plasmonic terahertz waveguide by lithographically patterning an array of sub-wavelength pillars on a silicon substrate. Doped silicon can exhibit conductive properties at terahertz frequencies, making it a convenient substitute for conventional metals in plasmonic devices. However, the surface wave solution at a doped silicon surface is usually poorly confined and lossy. Here we demonstrate that by patterning the silicon surface with an array of sub-wavelength pillars, the resulting structure can support a terahertz surface mode that is tightly confined in both transverse directions. Further, we observe that the resonant behavior associated with the surface modes depends on the dimensions of the pillars, and can be tailored through control of the structural parameters. We experimentally fabricated devices with different geometries, and characterized the performance using terahertz time-domain spectroscopy. The resulting waveguide characteristics are confirmed using finite element numerical simulations, and we further show that a simple one-dimensional analytical theory adequately predicts the observed dispersion relation.https://doi.org/10.1088/1367-2630/15/8/085031 |
| spellingShingle | Gagan Kumar Shanshan Li Mohammad M Jadidi Thomas E Murphy Terahertz surface plasmon waveguide based on a one-dimensional array of silicon pillars New Journal of Physics |
| title | Terahertz surface plasmon waveguide based on a one-dimensional array of silicon pillars |
| title_full | Terahertz surface plasmon waveguide based on a one-dimensional array of silicon pillars |
| title_fullStr | Terahertz surface plasmon waveguide based on a one-dimensional array of silicon pillars |
| title_full_unstemmed | Terahertz surface plasmon waveguide based on a one-dimensional array of silicon pillars |
| title_short | Terahertz surface plasmon waveguide based on a one-dimensional array of silicon pillars |
| title_sort | terahertz surface plasmon waveguide based on a one dimensional array of silicon pillars |
| url | https://doi.org/10.1088/1367-2630/15/8/085031 |
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