Photonic Design of Dielectric Laser Accelerators and Quantum Features of Free Electrons

Download or read book Photonic Design of Dielectric Laser Accelerators and Quantum Features of Free Electrons written by Zhexin Zhao and published by . This book was released on 2021 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Particle accelerators are important in areas ranging from fundamental science to medical care. To advance particle accelerators, it is critical to achieve high acceleration gradient, compact size and low cost. Dielectric laser accelerators (DLAs) are promising candidates which have more than 10 times higher acceleration gradient than conventional radio-frequency accelerators and can be integrated on-chip.In this thesis, we present a few DLA designs to solve critical challenges for DLAs, such as providing continuous acceleration as the electron velocity increases using a tapered slot waveguide and increasing the electron current throughput with a photonic crystal multi-channel DLA. We also discuss the design principles of apodized grating couplers, which are crucial elements in the on-chip power delivery system for DLAs. We demonstrate how basic electromagnetic theory and physical intuitions guide the design of such devices.On the other hand, sub-femtosecond manipulation of the electron in DLAs makes it a versatile electron probe to study fundamental science. Along this direction, we also discuss the quantum features of the free electron by studying the interaction between a free electron and a two-level atom. We show that resonantly modulating the free electron with optical field can enhance the electron-atom interaction. It is possible to probe the atomic coherence with the modulated electron. Also, entanglement between two-level atoms can be created by interacting them with the same free electron. Those provide new perspectives for ultrafast physics studies using the free-electron probe.