Multichannel filters via Γ-M and Γ-K waveguide coupling in two-dimensional triangular-lattice photonic crystal slabs

Ya-Zhao Liu; Rong-Juan Liu; Shuai Feng; Cheng Ren; Hai-Fang Yang; Dao-Zhong Zhang; Zhi-Yuan Li
December 2008
Applied Physics Letters;12/15/2008, Vol. 93 Issue 24, p241107
Academic Journal
We demonstrate the design, fabrication, and characterization of a multichannel filter in a two-dimensional triangular-lattice photonic crystal slab. The output signal channel, which directs in the Γ-M crystalline direction, is orthogonal to the input signal channel that directs in the Γ-K crystalline direction. In each channel, the filtering function is guaranteed by the indirect resonant coupling between the waveguide and the cavity. Four resonant cavities with different sizes provide the mechanism of finely tuning the output wavelength. Our experimental results are in good agreement with simulations.


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