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Analysis of nonuniform field emission from a sharp tip emitter of Lorentzian or hyperboloid shape

หน่วยงาน Nanyang Technological University, Singapore

รายละเอียด

ชื่อเรื่อง : Analysis of nonuniform field emission from a sharp tip emitter of Lorentzian or hyperboloid shape
นักวิจัย : Sun, Sheng , Ang, Ricky Lay Kee
คำค้น : DRNTU::Science::Physics
หน่วยงาน : Nanyang Technological University, Singapore
ผู้ร่วมงาน : -
ปีพิมพ์ : 2556
อ้างอิง : Sun, S., & Ang, L. K. R. (2013). Analysis of nonuniform field emission from a sharp tip emitter of Lorentzian or hyperboloid shape. Journal of applied physics, 113(14). , 00218979 , http://hdl.handle.net/10220/9929 , http://dx.doi.org/10.1063/1.4798926
ที่มา : -
ความเชี่ยวชาญ : -
ความสัมพันธ์ : Journal of applied physics
ขอบเขตของเนื้อหา : -
บทคัดย่อ/คำอธิบาย :

For a sharp tip emitter, due to the non-uniform emission feature and the electron beam expansion in the vacuum, it is difficult to precisely determine the average field enhancement factor β_c as well as the effective emission area S_eff for a single field emitter. In this paper, we conduct a numerical experiment to simulate the electron field emission from a sharp tip emitter (Lorentzian or hyperboloid shape). By collecting the emission current I_tot at the finite anode area S_tot, we establish the criteria in using Fowler-Nordheim plot to estimate both β_c and S_eff, which agree well with our initial emission condition. It is found that the values of β_c and S_eff depend on the emitter’s properties as well as the size of the anode area S_tot. In order to determine the precise value of β_c, S_tot must be large enough to collect all the emitted electrons from the sharp tip (e.g., I_tot reaches maximum). As an example, a Lorentzian type emitter with an aspect ratio of 10 (height over width), the effective enhancement factor is about β_c = 33 as compared to the maximal enhancement of 35 at the apex. At similar maximal enhancement factor at the apex (=360), both types of emitters will give different average field enhancement dependent on the collecting area. The extension of this simple model to a statistical more complicated model to simulate field emission from a cathode consisting of many field emitters is also briefly discussed. This paper should be useful to analyze and characterize field emission data together with experimental measurement.

บรรณานุกรม :
Sun, Sheng , Ang, Ricky Lay Kee . (2556). Analysis of nonuniform field emission from a sharp tip emitter of Lorentzian or hyperboloid shape.
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Sun, Sheng , Ang, Ricky Lay Kee . 2556. "Analysis of nonuniform field emission from a sharp tip emitter of Lorentzian or hyperboloid shape".
    กรุงเทพมหานคร : Nanyang Technological University, Singapore.
Sun, Sheng , Ang, Ricky Lay Kee . "Analysis of nonuniform field emission from a sharp tip emitter of Lorentzian or hyperboloid shape."
    กรุงเทพมหานคร : Nanyang Technological University, Singapore, 2556. Print.
Sun, Sheng , Ang, Ricky Lay Kee . Analysis of nonuniform field emission from a sharp tip emitter of Lorentzian or hyperboloid shape. กรุงเทพมหานคร : Nanyang Technological University, Singapore; 2556.