Improved 60/spl deg/ bend transmission of submicron-width waveguides defined in two-dimensional photonic crystals

We compare quantitatively the transmission properties of various 60/spl deg/ bends carved into a photonic crystal based on a two-dimensional triangular lattice of holes perforating a GaAs-based heterostructure. The bends are inserted into channel waveguides defined by three missing rows in the photonic crystal. Their design is inspired by some ideas from classical integrated optics. We show experimentally that in some cases the transmission of the bent waveguide is fairly high, up to 70%, within a bandwidth of 3%, e.g., 30 nm at 1 /spl mu/m, sufficient to contemplate wavelength-division-multiplexing applications. The observed performance opens the opportunity to implement a variety of optical functions in view of future photonic crystal integrated circuits for which low-loss bends constitute an essential building block.

[1]  Henri Benisty,et al.  Mini stopbands of a one dimensional system: the channel waveguide in a two-dimensional photonic crystal , 2001 .

[2]  J. Joannopoulos,et al.  High Transmission through Sharp Bends in Photonic Crystal Waveguides. , 1996, Physical review letters.

[3]  Steven G. Johnson,et al.  Quantitative Analysis of Bending Efficiency in Photonic-Crystal Waveguide Bends at x=1.55{micro}m Wavelengths , 2001 .

[4]  Henri Benisty,et al.  Modal analysis of optical guides with two‐dimensional photonic band‐gap boundaries , 1996 .

[5]  Experimental investigation of photonic crystal waveguide devices and line-defect waveguide bends , 2000 .

[6]  Henri Benisty,et al.  Radiation losses of waveguide-based two-dimensional photonic crystals: Positive role of the substrate , 2000 .

[7]  Henri Benisty,et al.  Finite-depth and intrinsic losses in vertically etched two-dimensional photonic crystals , 2002 .

[8]  S. Noda,et al.  Waveguides and waveguide bends in two-dimensional photonic crystal slabs , 2000 .

[9]  Thomas F. Krauss,et al.  Optical and confinement properties of two-dimensional photonic crystals , 1999 .

[10]  A. Scherer,et al.  Waveguiding in Planar Photonic Crystals , 2000 .

[11]  Henri Benisty,et al.  Finely resolved transmission spectra and band structure of two dimensional photonic crystals using emission from Inas quantum dots , 1999 .

[12]  Henri Benisty,et al.  Out-of-plane losses of two-dimensional photonic crystals waveguides: Electromagnetic analysis , 2001 .

[13]  Henri Benisty,et al.  Enhanced transmission through photonic-crystal-based bent waveguides by bend engineering , 2001 .

[14]  T. Krauss,et al.  Transmission properties of two-dimensional photonic crystal channel waveguides , 2002 .

[15]  Wim Bogaerts,et al.  Out-of-plane scattering in 1-D photonic crystal slabs , 2001, IEEE Photonics Technology Letters.

[16]  Steven G. Johnson,et al.  Photonic Crystals: Molding the Flow of Light , 1995 .

[17]  François Ladouceur,et al.  A new general approach to optical waveguide path design , 1995 .

[18]  A. Birner,et al.  Single-mode transmission in two-dimensional macroporous silicon photonic crystal waveguides. , 2000, Optics letters.

[19]  Steven G. Johnson,et al.  High-density integrated optics , 1999 .

[20]  Anne Talneau,et al.  Photonic-crystal ultrashort bends with improved transmission and low reflection at 1.55 μm , 2002 .

[21]  Henri Benisty,et al.  Low-loss channel waveguides with two-dimensional photonic crystal boundaries , 2000 .

[22]  Henri Benisty,et al.  Resonant and nonresonant transmission through waveguide bends in a planar photonic crystal , 2001 .

[23]  Toshihiko Baba,et al.  Observation of light propagation in photonic crystal optical waveguides with bends , 1999 .

[24]  A. Tomita,et al.  Lightwave propagation through a 120° sharply bent single-line-defect photonic crystal waveguide , 2000 .