Method for Computationally Efficient Design of Dielectric Laser Accelerators

Abstract

Dielectric microstructures have generated much interest in recent years as a means of accelerating charged particles when powered by solid state lasers. The acceleration gradient (or particle energy gain per unit length) is an important figure of merit. To design structures with high acceleration gradients, we explore the adjoint variable method, a highly efficient technique used to compute the sensitivity of an objective with respect to a large number of parameters. With this formalism, the sensitivity of the acceleration gradient of a dielectric structure with respect to its entire spatial permittivity distribution is calculated by the use of only two full-field electromagnetic simulations, the original and adjoint. The adjoint simulation corresponds physically to the reciprocal situation of a point charge moving through the accelerator gap and radiating. Using this formalism, we perform numerical optimizations aimed at maximizing acceleration gradients, which generate fabricable structures of greatly improved performance in comparison to previously examined geometries.

arXiv comment13 pages, 4 figures

References in corpus (4)

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• Dielectric Laser Acceleration
• Three-dimensional dielectric photonic crystal structures for laser-driven acceleration
• Dielectric laser acceleration of electrons in the vicinity of single and double grating structures - theory and simulations

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