Acta Optica Sinica, Volume. 31, Issue 1, 113002(2011)
Slow-Light Characteristics of Photonic Crystal Waveguides
Based on two-dimensional triangular lattice air-hole photonic crystal, a kind of waveguide structure with good slow-light characteristics is proposed by inducing coupled-cavity on both sides of the photonic crystal single-line defected waveguides. The energy-band structure, group velocity and group-velocity dispersion characteristics of slow-light mode are analyzed by plane wave expansion method. For the waveguide structure using single-defect cavity as coupled cavity, the group velocity of 0.0128c at the zero-dispersion point with the bandwidth of 409 GHz in the 1.55 μm wavelength could be obtained by appropriately adjusting the waveguide width. As for the waveguide structure using two-defect cavity as coupled cavity with the super-cell of 4a×9b, the group velocity can reach 0.0070c at the zero-dispersion point with the bandwidth of 226 GHz in the 1.55 μm wavelength by adjusting the waveguide width. To further increase the distance between the two-defect cavities, the slow-light mode with group velocity of 0.0011c at the zero-dispersion point could be obtained. Besides, the slow-light waveguide can meet different requirements by selecting the appropriate width of waveguide.
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Qu Lianjie, Yang Yuede, Huang Yongzhen. Slow-Light Characteristics of Photonic Crystal Waveguides[J]. Acta Optica Sinica, 2011, 31(1): 113002
Category: Integrated Optics
Received: Jan. 1, 2010
Accepted: --
Published Online: Dec. 24, 2010
The Author Email: Lianjie Qu (qulianjie@semi.ac.cn)