Design, fabrication, and characterization of coupling-strength-controlled directional coupler based on two-dimensional photonic-crystal slab waveguides

A directional coupler (DC) with a coupling-strength control defect (CCD) based on a two-dimensional photonic-crystal slab waveguide is numerically and experimentally studied. The structure consists of two parallel-coupled single-defect waveguides separated by a triple-line air-hole array, with some missing air holes in the middle of the triple line. Using a two-dimensional finite-difference time-domain method, a 50% coupler was designed and almost 50% coupling performance was experimentally confirmed at a wavelength of ∼1.3 μm with a coupling length of about 7 μm, about 1/3 in length as compared to the DC without the CCD.

[1]  Hirohito Yamada,et al.  Photonic crystal line defect waveguide directional coupler , 2001 .

[2]  C. G. Someda,et al.  Coupling and decoupling of electromagnetic waves in parallel 2D photonic crystal waveguides , 2002 .

[3]  Steven G. Johnson,et al.  Waveguide branches in photonic crystals , 2001 .

[4]  J D Joannopoulos,et al.  Low-loss, wide-angle Y splitter at approximately ~1.6- mum wavelengths built with a two-dimensional photonic crystal. , 2002, Optics letters.

[5]  K. Tajima.  All-Optical Switch with Switch-Off Time Unrestricted by Carrier Lifetime , 1993 .

[6]  Hiroshi Ishikawa,et al.  Similar role of waveguide bends in photonic crystal circuits and disordered defects in coupled cavity waveguides: An intrinsic problem in realizing photonic crystal circuits , 2003 .

[7]  D. Larkman,et al.  Photonic crystals , 1999, International Conference on Transparent Optical Networks (Cat. No. 99EX350).

[8]  M. Koshiba,et al.  Time-domain beam propagation method and its application to photonic crystal circuits , 2000, Journal of Lightwave Technology.

[9]  Yoshimasa Sugimoto,et al.  Fabrication and characterization of different types of two-dimensional AlGaAs photonic crystal slabs , 2002 .

[10]  Shojiro Kawakami,et al.  Optical directional couplers based on autocloned photonic crystals , 2003 .

[11]  T. Krauss,et al.  Y junctions in photonic crystal channel waveguides: high transmission and impedance matching. , 2002, Optics letters.

[12]  Susumu Noda,et al.  Trapping and emission of photons by a single defect in a photonic bandgap structure , 2000, Nature.