2011 Particle Accelerator Conference - List of Authors (McGuinness, C.)

Paper

Title

Page

Design of On-Chip Power Transport and Coupling Components for a Silicon Woodpile Accelerator

241

Z. Wu, E.R. Colby, C. McGuinness, C.-K. Ng
SLAC, Menlo Park, California, USA

Three-dimensional woodpile photonic bandgap (PBG) waveguide enables high-gradient and efficient laser driven acceleration, while various accelerator components, including laser couplers, power transmission lines, woodpile accelerating and focusing waveguides, and energy recycling resonators, can be potentially integrated on a single monolithic structure via lithographic fabrications. This paper will present designs of this on-chip accelerator based on silicon-on-insulator (SOI) waveguide. Laser power is coupled from free-space or fiber into SOI waveguide by grating structures on the silicon surface, split into multiple channels to excite individual accelerator cells, and eventually gets merged into the power recycle pathway. Design and simulation results will be presented regarding various coupling components involved in this network.

MOP095

Experimental Determination of Damage Threshold Characteristics of IR Compatible Optical Materials

277

K. Soong, E.R. Colby, C. McGuinness
SLAC, Menlo Park, California, USA
R.L. Byer, E.A. Peralta
Stanford University, Stanford, California, USA

Funding: Work funded by DOE contract DE‐AC02‐76SF00515 (SLAC)
The accelerating gradient in a laser-driven dielectric accelerating structure is often limited by the laser damage threshold of the structure. For a given laser-driven dielectric accelerator design, we can maximize the accelerating gradient by choosing the best combination of the accelerator’s constituent material and operating wavelength. We present here a model of the damage mechanism from ultrafast infrared pulses and compare that model with experimental measurements of the damage threshold of bulk silicon. Additionally, we present experimental measurements of a variety of candidate materials, thin films, and nanofabricated accelerating structures.

MOP096

Fabrication and Measurement of Dual Layer Silica Grating Structures for Direct Laser Acceleration

280

E.A. Peralta, R.L. Byer
Stanford University, Stanford, California, USA
E.R. Colby, R.J. England, C. McGuinness, K. Soong
SLAC, Menlo Park, California, USA

Funding: Department of Energy: DE-AC02-76SF00515(SLAC),DE-FG06-97ER41276
We present our progress in the fabrication and measurement of a transmission-based dielectric double-grating accelerator structure. The structure lends itself to simpler coupling to the accelerating mode in the waveguide with negligible group velocity dispersion effects, allowing for operation with ultra-short (fs) laser pulses. This document describes work being done at the Stanford Nanofabrication Facility to create a monolithic guided-wave structure with 800 nm period gratings separated by a fixed sub-wavelength gap using standard optical lithographic techniques on a fused silica substrate. An SEM and other characterization tools were used to measure the fabrication deviations of the grating geometry and simulations were carried out in MATLAB and HFSS to study the effects of such deviations on the resulting accelerating gradient.

MOP133

Fabrication and Measurements of a Silicon Woodpile Accelerator Structure

343

C. McGuinness, E.R. Colby, R.J. England, R. Laouar, R.J. Noble, K. Soong, J.E. Spencer, Z. Wu, D. Xu
SLAC, Menlo Park, California, USA
R.L. Byer, E.A. Peralta
Stanford University, Stanford, California, USA

Funding: DOE grants: DE-AC02-76SF00515 and DE-FG03-97ER41043-II
We present results for the fabrication of a silicon woodpile accelerator structure. The structure was designed to have an accelerating mode at 3.95 μm, with a high characteristic impedance and an accelerating gradient of 530 MeV/m. The fabrication process uses standard nanofabrication techniques in a layer-by-layer process to produce a three-dimensional photonic crystal with 400 nm features. Reflection spectroscopy measurements reveal a peak spanning from three to five microns, and are show good agreement with simulations.
* Sears, PRST-AB, 11, 101301, (2008).
** Cowan, PRST-AB, 11, 011301, (2008).
*** McGuinness, J. Mod. Opt., vol. 56, is. 18, pp. 2142, (2009).
**** Lin, Nature, 394, pp. 251 (1998).

THOBN4

Experiment to Demonstrate Acceleration in Optical Photonic Bandgap Structures

2067

R.J. England, E.R. Colby, R. Laouar, C. McGuinness, D. Mendez, C.-K. Ng, J.S.T. Ng, R.J. Noble, K. Soong, J.E. Spencer, D.R. Walz, Z. Wu, D. Xu
SLAC, Menlo Park, California, USA
E.A. Peralta
Stanford University, Stanford, California, USA

Funding: This work was funded by Department of Energy Grants DE-AC02-76SF00515, DE-FG06-97ER41276.
Optical scale dielectric structures offer a promising medium for high-gradient, compact, low-cost acceleration of charged particles. An experimental program is underway at the SLAC E163 facility to demonstrate acceleration in photonic bandgap structures driven by short laser pulses. We present initial experimental results, discuss structure and experimental design, and present first estimates of achievable gradient.

Slides THOBN4 [5.925 MB]

Paper	Title	Page
MOP072	Design of On-Chip Power Transport and Coupling Components for a Silicon Woodpile Accelerator	241
	Z. Wu, E.R. Colby, C. McGuinness, C.-K. Ng SLAC, Menlo Park, California, USA
	Three-dimensional woodpile photonic bandgap (PBG) waveguide enables high-gradient and efficient laser driven acceleration, while various accelerator components, including laser couplers, power transmission lines, woodpile accelerating and focusing waveguides, and energy recycling resonators, can be potentially integrated on a single monolithic structure via lithographic fabrications. This paper will present designs of this on-chip accelerator based on silicon-on-insulator (SOI) waveguide. Laser power is coupled from free-space or fiber into SOI waveguide by grating structures on the silicon surface, split into multiple channels to excite individual accelerator cells, and eventually gets merged into the power recycle pathway. Design and simulation results will be presented regarding various coupling components involved in this network.

MOP095	Experimental Determination of Damage Threshold Characteristics of IR Compatible Optical Materials	277
	K. Soong, E.R. Colby, C. McGuinness SLAC, Menlo Park, California, USA R.L. Byer, E.A. Peralta Stanford University, Stanford, California, USA
	Funding: Work funded by DOE contract DE‐AC02‐76SF00515 (SLAC) The accelerating gradient in a laser-driven dielectric accelerating structure is often limited by the laser damage threshold of the structure. For a given laser-driven dielectric accelerator design, we can maximize the accelerating gradient by choosing the best combination of the accelerator’s constituent material and operating wavelength. We present here a model of the damage mechanism from ultrafast infrared pulses and compare that model with experimental measurements of the damage threshold of bulk silicon. Additionally, we present experimental measurements of a variety of candidate materials, thin films, and nanofabricated accelerating structures.

MOP096	Fabrication and Measurement of Dual Layer Silica Grating Structures for Direct Laser Acceleration	280
	E.A. Peralta, R.L. Byer Stanford University, Stanford, California, USA E.R. Colby, R.J. England, C. McGuinness, K. Soong SLAC, Menlo Park, California, USA
	Funding: Department of Energy: DE-AC02-76SF00515(SLAC),DE-FG06-97ER41276 We present our progress in the fabrication and measurement of a transmission-based dielectric double-grating accelerator structure. The structure lends itself to simpler coupling to the accelerating mode in the waveguide with negligible group velocity dispersion effects, allowing for operation with ultra-short (fs) laser pulses. This document describes work being done at the Stanford Nanofabrication Facility to create a monolithic guided-wave structure with 800 nm period gratings separated by a fixed sub-wavelength gap using standard optical lithographic techniques on a fused silica substrate. An SEM and other characterization tools were used to measure the fabrication deviations of the grating geometry and simulations were carried out in MATLAB and HFSS to study the effects of such deviations on the resulting accelerating gradient.

MOP133	Fabrication and Measurements of a Silicon Woodpile Accelerator Structure	343
	C. McGuinness, E.R. Colby, R.J. England, R. Laouar, R.J. Noble, K. Soong, J.E. Spencer, Z. Wu, D. Xu SLAC, Menlo Park, California, USA R.L. Byer, E.A. Peralta Stanford University, Stanford, California, USA
	Funding: DOE grants: DE-AC02-76SF00515 and DE-FG03-97ER41043-II We present results for the fabrication of a silicon woodpile accelerator structure. The structure was designed to have an accelerating mode at 3.95 μm, with a high characteristic impedance and an accelerating gradient of 530 MeV/m. The fabrication process uses standard nanofabrication techniques in a layer-by-layer process to produce a three-dimensional photonic crystal with 400 nm features. Reflection spectroscopy measurements reveal a peak spanning from three to five microns, and are show good agreement with simulations. * Sears, PRST-AB, 11, 101301, (2008). Cowan, PRST-AB, 11, 011301, (2008). * McGuinness, J. Mod. Opt., vol. 56, is. 18, pp. 2142, (2009). **** Lin, Nature, 394, pp. 251 (1998).

THOBN4	Experiment to Demonstrate Acceleration in Optical Photonic Bandgap Structures	2067
	R.J. England, E.R. Colby, R. Laouar, C. McGuinness, D. Mendez, C.-K. Ng, J.S.T. Ng, R.J. Noble, K. Soong, J.E. Spencer, D.R. Walz, Z. Wu, D. Xu SLAC, Menlo Park, California, USA E.A. Peralta Stanford University, Stanford, California, USA
	Funding: This work was funded by Department of Energy Grants DE-AC02-76SF00515, DE-FG06-97ER41276. Optical scale dielectric structures offer a promising medium for high-gradient, compact, low-cost acceleration of charged particles. An experimental program is underway at the SLAC E163 facility to demonstrate acceleration in photonic bandgap structures driven by short laser pulses. We present initial experimental results, discuss structure and experimental design, and present first estimates of achievable gradient.
	Slides THOBN4 [5.925 MB]