Compact couplers for overmoded three-dimensional photonic crystal waveguides

An overmoded photonic crystal waveguide based on the three-dimensional woodpile lattice has been proposed for a highenergy charged particle accelerator. Critical to overall accelerator efficiency is the ability to couple power into an uninterrupted vacuum waveguide in a very small volume. We present designs and simulations of coupling to the waveguide, both from free space and from a waveguide adjoining it at 90 degrees. We discuss details of the computation, including the use of symmetries and extraction of the resulting transmission.

[1]  R. Ruth,et al.  Distributed grating-assisted coupler for optical all-dielectric electron accelerator , 2005, Physical Review Special Topics - Accelerators and Beams.

[2]  John R. Cary,et al.  Extracting degenerate modes and frequencies from time-domain simulations with filter-diagonalization , 2008, J. Comput. Phys..

[3]  X. Lin.  Photonic band gap fiber accelerator , 2001 .

[4]  John R. Cary,et al.  A stable FDTD algorithm for non-diagonal, anisotropic dielectrics , 2007, J. Comput. Phys..

[5]  R. Siemann.  Energy Efficiency of Laser Driven, Structure Based Accelerators , 2004 .

[6]  J. E. Spencer,et al.  Experiment to Detect Accelerating Modes in a Photonic Bandgap Fiber , 2009 .

[7]  J. Cary,et al.  VORPAL: a versatile plasma simulation code , 2004 .

[8]  Robert L. Byer,et al.  Woodpile Structure Fabrication for Photonic Crystal Laser Acceleration , 2009 .

[9]  Truncated photonic crystal cavities with optimized mode confinement , 2008 .

[10]  A. Mizrahi,et al.  Optical Bragg accelerators. , 2004, Physical review. E, Statistical, nonlinear, and soft matter physics.

[11]  B. Cowan.  Three-dimensional dielectric photonic crystal structures for laser-driven acceleration , 2007, 0711.3190.

[12]  Che Ting Chan,et al.  Photonic band gaps in three dimensions: New layer-by-layer periodic structures , 1994 .

[13]  B. Cowan.  Two-dimensional photonic crystal accelerator structures , 2003 .

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

[15]  Steven G. Johnson,et al.  Improving accuracy by subpixel smoothing in the finite-difference time domain. , 2006, Optics letters.

[16]  R. Byer,et al.  Energy efficiency of an intracavity coupled, laser-driven linear accelerator pumped by an external laser , 2005 .

[17]  Perry,et al.  Nanosecond-to-femtosecond laser-induced breakdown in dielectrics. , 1996, Physical review. B, Condensed matter.

[18]  Benjamin M. Cowan,et al.  Optical damage threshold of silicon for ultrafast infrared pulses , 2006, SPIE Laser Damage.

[19]  Brent C. Stuart,et al.  Optical ablation by high-power short-pulse lasers , 1996 .

[20]  Allen Taflove,et al.  Computational Electrodynamics the Finite-Difference Time-Domain Method , 1995 .