CAJ | 학술논문

场致电子发射具有高效、响应快等优点，有着广泛的应用前景。锥形和金字塔形尖端是两种常见的场发射尖端结构。主要分析了这两种尖端结构的场发射电学特性，并在此基础上提出了进一步实现结构优化的途径。为此，建立了两种尖端的三维模型，并利用有限元法深入讨论了结构尺寸，包括尖端曲率半径、尖端与阳极间距以及尖端高度对电场分布以及电场强度的影响。结果表明，减小尖端曲率半径、缩短尖端与阳极间距、以及选择适当的锥体高度是优化尖端场致电子发射性能的三个重要途径。在综合考虑电场分布以及电场强度的情况下，可以发现锥形尖端更有利于产生高密度小束径的低能电子束，而金字塔形尖端则更适用于高压力灵敏度的应用需求。
장치전자발사구유고효、향응쾌등우점，유착엄범적응용전경。추형화금자탑형첨단시량충상견적장발사첨단결구。주요분석료저량충첨단결구적장발사전학특성，병재차기출상제출료진일보실현결구우화적도경。위차，건립료량충첨단적삼유모형，병이용유한원법심입토론료결구척촌，포괄첨단곡솔반경、첨단여양겁간거이급첨단고도대전장분포이급전장강도적영향。결과표명，감소첨단곡솔반경、축단첨단여양겁간거、이급선택괄당적추체고도시우화첨단장치전자발사성능적삼개중요도경。재종합고필전장분포이급전장강도적정황하，가이발현추형첨단경유리우산생고밀도소속경적저능전자속，이금자탑형첨단칙경괄용우고압력령민도적응용수구。
Conical and pyramidal emitters are two generic field-emitter structures. Due to specific advantages of field emission, both emitters are widely employed to produce electron beams. The main focus of this paper is to analyze the electrical characteristics of both emitters, and further, to highlight the key criteria in optimizing the structures. For this purpose, three-dimensional models were implemented and finite-element analysis was used to investigate the influences of emitter geometries, including shape of emitter, emitter radius of curvature, emitter-anode distance and emitter height, on its electric field distribution and strength. The results indicate that reducing tip radius of curvature and shorting the emitter-anode distance are effective ways to increase the field strength enhancement, while a proper ratio of the emitter height to the emitter-anode distance is also an important factor. In addition, in consideration of both electric field distribution and strength, the conical emitter is suitable for high-resolution, large current-density applications, whereas the pyramidal emitter has better pressure sensitivity.