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
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.
收稿日期: 2015-03-22
出版日期: 2015-06-30
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2015, Vol. 32 
