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Fernando F Dall'Agnol1, Thiago A de Assis2

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Field emission from closely spaced emitters shows a nonintuitive increase in field enhancement as distance decreases. This proximity effect, especially with high aspect ratio emitters, can significantly boost emission current and lead to self-oscillations.

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Area of Science:

  • Physics
  • Materials Science
  • Electrical Engineering

Background:

  • Field emission from micro/nano-emitters is crucial for vacuum electronics.
  • Understanding emitter interactions at close proximity is essential for device performance.
  • The close proximity electrostatic effect (CPEE) influences field enhancement and emission.

Purpose of the Study:

  • Investigate field emission properties of closely spaced emitter clusters.
  • Analyze the maximum local field enhancement factor and emission current.
  • Explore the impact of emitter proximity and aspect ratio on field emission.

Main Methods:

  • Numerical simulations using the finite-element technique.
  • Analysis of field enhancement factor ([Formula: see text]) and emission current.
  • Modeling of emitter clusters with 2, 3, 4, and 7 identical emitters.

Main Results:

  • Observed nonintuitive behavior: [Formula: see text] increases as emitter distance decreases.
  • Demonstrated that CPEE significantly enhances emission current for peripheral emitters with high aspect ratios.
  • Identified CPEE as a potential mechanism for self-oscillations in emitters.

Conclusions:

  • Close proximity electrostatic effect (CPEE) plays a critical role in field emission from emitter clusters.
  • High aspect ratio peripheral emitters benefit most from CPEE, increasing emitted current.
  • CPEE offers insights into emitter self-oscillations and potential applications in nanometric oscillators.