Edge enhancement control in linear arrays of ungated field emitters

In arrays of ungated field emitters, the field enhancement factor of each emitter decreases as the distance between the emitters decreases, an effect known as screening. At the edge of these arrays, emitters experience reduced screening, leading to higher field enhancement factors than emitters at t...

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Veröffentlicht in:Journal of applied physics 2016-01, Vol.119 (4)
Hauptverfasser: Harris, J. R., Jensen, K. L., Shiffler, D. A.
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description In arrays of ungated field emitters, the field enhancement factor of each emitter decreases as the distance between the emitters decreases, an effect known as screening. At the edge of these arrays, emitters experience reduced screening, leading to higher field enhancement factors than emitters at the array center, causing nonuniform emission across the array. Here, we consider this effect in linear arrays of ungated field emitters spaced at distances comparable to their heights, which is the regime that generally maximizes their average current density. A Line Charge Model is used to assess the degree to which these edge effects propagate into the array interior, and to study the impact of varying the height, location, and tip radius of emitters at the ends of an array on the edge enhancement. It is shown that each of these techniques can accomplish this edge enhancement control, but each has advantages and disadvantages that will be discussed.
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source AIP Journals Complete; Alma/SFX Local Collection
subjects Charge density
Edge effect
Emitters
Linear arrays
Screening
title Edge enhancement control in linear arrays of ungated field emitters
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