| FUNDAMENTAL AREAS OF PHENOMENOLOGY(INCLUDING APPLICATIONS) |
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Extraordinary Optical Confinement in a Silicon Slot Waveguide with Metallic Gratings |
| LIANG Han, ZHAN Ke-Tao**, HOU Zhi-Ling** |
School of Science & Beijing Key Laboratory of Environmentally Harmful Chemicals Analysis, Beijing University of Chemical Technology, Beijing 100029
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| Cite this article: |
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LIANG Han, ZHAN Ke-Tao, HOU Zhi-Ling 2015 Chin. Phys. Lett. 32 064206 |
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Abstract We present a silicon slot waveguide with metallic gratings embedded on the silicon surface in the slot region. The dependence of the optical coupling between two silicon wires on the width of the metal gap and the slot size are studied in detail. The results show that the optical field in the slot region with metallic gratings is significantly enhanced compared with the traditional slot waveguide due to the surface plasmon polaritons coupling on metallic gratings. The extraordinary optical confinement is attributed to the low effective dielectric constant of metallic gratings. The effective dielectric constant decreases with the increasing wavelength, and reaches the minimum when the width of the metal gap is about 0.01 times the wavelength.
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Received: 22 March 2015
Published: 30 June 2015
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| PACS: |
42.79.Gn
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(Optical waveguides and couplers)
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61.46.-w
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(Structure of nanoscale materials)
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77.22.Ch
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(Permittivity (dielectric function))
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78.67.Uh
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(Nanowires)
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42.82.Et
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(Waveguides, couplers, and arrays)
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