We report the design, fabrication, and characterization of a new nanophotonic device comprising a two-dimensional photonic crystal (PhC) lens of size 3 X 4 (mu)m fabricated in silicon-on-insulator. The PhC lens is put at the output of a planar waveguide of width 4.5 (mu)m to couple light into a planar waveguide of width 1 (mu)m, with two waveguides being of length 5 mm. A 1 (mu)m off-axis displacement of the smaller waveguide leads to an 8-fold reduction of output light intensity, which means that the focal spot size at output of the PhC lens in silicon is less than 1 (mu)m. The simulation has shown that the PhC lens has maximal transmittance at 1.55 (mu)m, with the coupling efficiency being 73percent. The focal spot size of the lens in air calculated at the FWHM is 0.32lambda (where lambda is the wavelength).
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机译：我们报告了一种新型纳米光子器件的设计，制造和表征，该器件包括在绝缘体上硅上制造的尺寸为3 X 4μm的二维光子晶体（PhC）透镜。将PhC透镜放置在宽度为4.5μm的平面波导的输出处，以将光耦合到宽度为1μm的平面波导中，两个波导的长度为5mm。较小波导的轴外偏移量为1μm，导致输出光强度降低8倍，这意味着PhC透镜在硅中的输出焦点尺寸小于1μm。仿真表明，PhC透镜在1.55μm处具有最大透射率，耦合效率为73％。以FWHM计算得出的镜头在空气中的焦点尺寸为0.32λ（其中λ是波长）。
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