title: Photonic crystal lens for coupling two waveguides.
abstract: We report the design, fabrication, and characterization of a new nanophotonic device comprising a two-dimensional photonic crystal (PhC) lens of size 3x4 microm fabricated in silicon-on-insulator. The PhC lens is put at the output of a planar waveguide of width 4.5 microm to couple light into a planar waveguide of width 1 microm, with two waveguides being of length 5 mm. A 1 microm 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 microm. The simulation has shown that the PhC lens has maximal transmittance at 1.55 microm, with the coupling efficiency being 73%. The focal spot size of the lens in air calculated at the FWHM is 0.32lambda (where lambda is the wavelength).
authors: Image Processing Systems Institute of the RAS, S. P. Korolyov Samara State Aerospace University, 151 Molodogvardeiskaya, Samara, 443001, Russia.
authors: Margarita I
authors: MI
authors: Kotlyar
authors: Yanis R
authors: YR
authors: Triandaphilov
authors: Alexey A
authors: AA
authors: Kovalev
authors: Victor A
authors: VA
authors: Soifer
authors: Maria V
authors: MV
authors: Kotlyar
authors: Liam
authors: L
authors: O'Faolain