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Maximizing the notional area in single tip field emitters.

Sergey V Filippov1, Fernando F Dall'Agnol2, Eugeni O Popov1

  • 1Ioffe Institute, 26 Politekhnicheskaya, St. Petersburg 194021, Russia.

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Summary

Optimizing single-tip field emitter devices requires specific construction. Simulations show maximum emission area occurs with an oblate semi-spheroid cap (axis ratio ξ≈0.85).

Keywords:
Electron microscopyLocal field enhancement factorNotional emission areaSingle tip emitters

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Area of Science:

  • Materials Science
  • Physics
  • Electrical Engineering

Background:

  • Optimizing high-brightness field emitter devices is crucial for advanced applications.
  • The geometry of single-tip emitters, specifically the cap's axis ratio (ξ), influences emission area.
  • Previous experiments explored various axis ratios on cylindrical bodies.

Purpose of the Study:

  • To determine the optimal axis ratio (ξ) for single-tip emitters to maximize their notional emission area.
  • To present a computational strategy for maximizing emitter performance.
  • To compare simulation results with other emitter configurations.

Main Methods:

  • High-accuracy computer simulations utilizing the finite element technique.
  • Systematic variation of the emitter cap's axis ratio (ξ) from oblate to prolate shapes.
  • Comparison of notional emission area as a function of ξ for ellipsoidal emitters on posts.

Main Results:

  • The notional emission area is maximized when the emitter cap is an oblate semi-spheroid.
  • The characteristic axis ratio for maximum emission area is approximately ξC≈0.85.
  • Simulation results provide a benchmark for other emitter designs.

Conclusions:

  • The study identifies a specific geometric configuration for maximizing field emitter performance.
  • Computational modeling provides an effective method for optimizing emitter design.
  • Findings guide the construction of efficient high-brightness field emitter devices.