Abstract
We report the design, fabrication, and characterization of a new nanophotonic device comprising a two-dimensional photonic crystal (PhC) lens of size fabricated in silicon-on-insulator. The PhC lens is put at the output of a planar waveguide of width to couple light into a planar waveguide of width , with two waveguides being of length . A 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 . The simulation has shown that the PhC lens has maximal transmittance at , with the coupling efficiency being 73%. The focal spot size of the lens in air calculated at the FWHM is (where λ is the wavelength).
© 2009 Optical Society of America
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