Manuscript on new structures for dielectric laser acceleration published in Optics Letters
In our recent publication in Optics Letters, we show how a dielectric laser accelerator (DLA) can be more efficient. Our silicon dual-pillar structures equipped with a distributed Bragg reflector (DBR) can accelerate electrons 57% more than their counterparts without a DBR. This improvement in acceleration efficiency is achieved by placing an on-chip DBR on one side of the structure. The DBR reflects about 99% of the incident light. The reflected light from the DBR interferes constructively with the incident laser light, yielding a stronger electric field in between the pillars where electrons are injected. This mimics a double-sided laser illumination without having the complexity of adding a second laser beam path. In this letter we demonstrate a maximum acceleration gradient of 133 MeV/m using such structures.
Our structures can be used to explore other components of a miniaturized dielectric-based particle accelerator for electron beam focusing and micro-bunching purposes. DLAs could ultimately lead to a compact laser-driven particle accelerator for variety of applications from low energy radiation therapy devices to high energy particle colliders.