光学学报, 2011, 31 (5): 0523003, 网络出版: 2011-05-09
金属亚波长波导阵列的聚焦和分束
Focusing and Beam Splitting of Metal Sub-Wavelength Waveguide Array
光通信 聚焦和分束 时域有限差分方法 波导阵列 亚波长金属结构 optical communications focusing and beam splitting finite difference time domain waveguide array subwavelength metal structure
摘要
由于光波在不同长度的波导中传输产生的相位延迟不同,特定的波导阵列可以对光波波阵面进行调制。理论推导发现三角形波导阵列可以实现聚焦,得出凸三角形波导阵列聚焦高度和焦深。利用时域有限差分法模拟了凸三角形波导阵列对光波的聚焦情况,通过比较发现模拟和理论推导结果非常吻合。同时模拟发现凹三角形波导阵列结构可以实现光的分束。
Abstract
Due to different phase delay of light wave propagating through waveguides with different length, wave front can be modulated by waveguide array. Based on theoretical derivation, the focused wave can be obtained through triangular waveguide array. Using the finite-difference in time-domain method, the focusing in the convex triangular waveguide arrays is simulated, and the results agree with theoretical derivation well. Simulation results also indicate that the concave triangular waveguide array can split the beam.
付康印, 陈跃刚. 金属亚波长波导阵列的聚焦和分束[J]. 光学学报, 2011, 31(5): 0523003. Fu Kangyin, Chen Yuegang. Focusing and Beam Splitting of Metal Sub-Wavelength Waveguide Array[J]. Acta Optica Sinica, 2011, 31(5): 0523003.