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Photonic crystal lens for coupling two waveguides

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Abstract

We report the design, fabrication, and characterization of a new nanophotonic device comprising a two-dimensional photonic crystal (PhC) lens of size 3×4μm fabricated in silicon-on-insulator. The PhC lens is put at the output of a planar waveguide of width 4.5μm to couple light into a planar waveguide of width 1μm, with two waveguides being of length 5mm. A 1μm 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 1μm. The simulation has shown that the PhC lens has maximal transmittance at 1.55μm, with the coupling efficiency being 73%. The focal spot size of the lens in air calculated at the FWHM is 0.32λ (where λ is the wavelength).

© 2009 Optical Society of America

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