Experimental verification of numerically optimized photonic crystal injector, Y-splitter, and bend

We present the experimental measurement of a photonic crystal (PhC) device comprising an injector, Y-splitter, and 60/spl deg/ bend. The complete device consists of a 9-/spl mu/m-long injector tapering down from 5 /spl mu/m into a triangular-lattice-of-holes single-line defect waveguide with period a=430 nm and 36.2% air filling factor (corresponding to a radius over period (r/a) ratio of 0.30), an optimized Y-junction, 60/spl deg/ bend and output injectors, with a total device footprint of 30 /spl mu/m. This is etched into a GaAs/AlGaAs heterostructure using chlorine/argon chemically assisted ion beam etching (CAIBE). An erbium-doped fiber amplifier (EDFA)-based source and Fabry-Perot technique are used to characterize the device. The device displays a bandwidth of approximately 110 nm in the 1.55 /spl mu/m window, and a transmission of 70% relative to the same length of 5-/spl mu/m-wide waveguide. This is compared with three-dimensional finite-difference time-domain (3-D FDTD) results, which have a bandwidth and transmission of 120 nm and 75%, respectively. The highlight of this paper is the close agreement of the numerically optimized complete microcircuit with its experimental equivalent, and the significant improvement in bandwidth over previous work on Y-junctions.

[1]  Thomas F. Krauss,et al.  High-aspect-ratio chemically assisted ion-beam etching for photonic crystals using a high beam voltage-current ratio , 2004 .

[2]  Y. Vlasov,et al.  Losses in single-mode silicon-on-insulator strip waveguides and bends. , 2004, Optics express.

[3]  Yoshimasa Sugimoto,et al.  Low propagation loss of 0.76 dB/mm in GaAs-based single-line-defect two-dimensional photonic crystal slab waveguides up to 1 cm in length. , 2004, Optics express.

[4]  Hiroshi Ishikawa,et al.  Two Dimensional Semiconductor-Based Photonic Crystal Slab Waveguides for Ultra-Fast Optical Signal Processing Devices (INVITED) , 2004 .

[5]  Iraklis Ntakis,et al.  Photonic crystal continuous taper for low-loss direct coupling into 2D photonic crystal channel waveguides and further device functionality , 2003 .

[6]  Ingrid Moerman,et al.  Efficient photonic crystal Y-junctions , 2003 .

[7]  Philippe Lalanne,et al.  Compound cavity measurement of transmission and reflection of a tapered single-line photonic-crystal waveguide , 2003 .

[8]  A. Lavrinenko,et al.  New design rules for planar photonic crystal devices obtained using automatic optimisation, leading to record efficiencies , 2003 .

[9]  Dennis W Prather,et al.  High-efficiency coupling structure for a single-line-defect photonic-crystal waveguide. , 2002, Optics letters.

[10]  C. Soukoulis,et al.  Low-reflection photonic-crystal taper for efficient coupling between guide sections of arbitrary widths. , 2002, Optics letters.

[11]  Yoshimasa Sugimoto,et al.  AlGaAs-based two-dimensional photonic crystal slab with defect waveguides for planar lightwave circuit applications , 2002 .

[12]  K. Asakawa,et al.  Light-propagation characteristics of Y-branch defect waveguides in AlGaAs-based air-bridge-type two-dimensional photonic crystal slabs. , 2002, Optics letters.

[13]  Henri Benisty,et al.  Models and measurements for the transmission of submicron-width waveguide bends defined in two-dimensional photonic crystals , 2002 .

[14]  T. Happ,et al.  Photonic crystal tapers for ultracompact mode conversion. , 2001, Optics letters.

[15]  D. Hofstetter,et al.  LOSS MEASUREMENTS ON SEMICONDUCTOR LASERS BY FOURIER ANALYSIS OF THE EMISSION SPECTRA , 1998 .