Advances on Ultrafast Silicon Field Emitter Array Photocathodes for Coherent Radiation Sources Based on Inverse Compton Scattering

14th International Conference on Micro and Nanotechnology for Power Generation and Energy Conversion Applications

物理学;能源学

Dong, C.^1 ; Swanwick, M.^2 ; Keathley, P.D.^1 ; Kärtner, F.X.^1,3 ; Velásquez-García, L.F.^2

Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge

MA

02139, United States^1

Microsystems Technology Laboratories, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge

MA

02139, United States^2

Center for Free-Electron Laser Science, DESY and Department of Physics, University of Hamburg, Notkestralse 85, Hamburg

D-22607, Germany^3

关键词: Biomedical imaging;    Coherent radiation;    Field emission arrays;    High repetition rate;    Intense laser pulse;    Inverse Compton scattering;    Nano-structured;    Silicon field emitter arrays;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/557/1/012055/pdf
DOI  :  10.1088/1742-6596/557/1/012055

来源: IOP

【 摘 要 】

Low-cost, compact, and coherent X-rays sources would enable exciting applications such as biomedical imaging of soft tissue and real-time visualisation of molecules at a widespread scale. A promising approach to implement such an X-ray source is based on inverse Compton scattering of a series of nanostructured electron sheets accelerated to relativistic speeds. Photon-triggered field emission arrays can readily produce planar arrays of electron bunches with pC-level sheet charge at high repetition rates using intense laser pulses. In this article, the performance of single-crystal, ultrafast, photon-actuated silicon field emitter arrays is investigated for varying emitter height. Charge vs. incident photon pulse energy characteristics and quantum efficiency of the devices are reported.