2017 年 45 巻 2 号 p. 104-
Dielectric laser accelerator has great potential for the miniaturization of particle accelerators. We present results of the numerical investigation of a silicon dual-pillar grating structure with a high accelerating gradient for subrelativistic electrons. An asymmetric configuration is utilized to generate an accelerating mode with lower skew. Driven by a 1550 nm laser with a peak fluence of 20 mJ/cm2 and a pulse length of 100 fs, the structure could achieve a maximum gradient of 0.42 GV/m for 50 keV electrons.