Speaker
Description
In dielectric laser acceleration (DLA), well known accelerator concepts are applied at a much smaller length scale. While classical accelerators use radiofrequency cavities, dielectric laser accelerators utilize dielectric nano-structures driven by strong infrared femtosecond laser pulses. Due to the high damage threshold of dielectric materials, acceleration gradients up to one or two orders of magnitude larger can be obtained. In addition to high acceleration gradients, the electron beam needs to be confined inside the narrow acceleration channel to maximize transmission. This can be achieved by employing alternating phase focusing (APF), a scheme also adapted from classical accelerators. By combining these approaches and utilizing a scanning electron, we recently demonstrated the coherent acceleration of electrons from 28.4 to 40.7 keV in a 500 µm long structure [1]. However, due to the two-dimensional design process and the lithography structure fabrication, the APF control was limited to one of the transverse directions. In this talk, we present how this principle can be expanded to full three-dimensional confinement by using multiple layers of dielectric materials. We will show first measurements of simple guiding structures and revisit the old two-dimensional designs to investigate the effect of top-illumination.
[1] Chlouba et al., Nature 622, 476 (2023)
