Active optical antennas driven by inelastic electron tunneling

We focus on the experimental demonstration of enhanced emission from single plasmonic tunneling junctions consisting of coupled nano antennas or noble metal tips on metallic substrates in scanning tunneling microscopy

Kai Braun

2018

Scholarcy highlights

  • Antennas are used to enhance the radiation or detection of electromagnetic waves
  • In this review, we focus on the experimental demonstration of enhanced emission from single plasmonic tunneling junctions consisting of coupled nano antennas or noble metal tips on metallic substrates in scanning tunneling microscopy
  • The basic antenna configuration was fabricated by electron beam lithography where the electric connection leads are again placed at the calculated nodes of the electric field to minimize the perturbance of the antennas’ localized surface plasmon resonances
  • All reviewed antennas are activated by inelastic tunneling with an intrinsic tunneling junction
  • We discussed several electrically connected planar gap types and compared them to metal tips used in scanning tunneling microscopy configuration
  • Cross-conjugated molecules in the gap can be utilized in engineer the tunnel barrier, while other types of molecules allow for additional conduction channels to increase the amplitude of the current noise and further increase the quantum efficiency by enhancing the inelastic tunneling rate
  • Additional illumination can be used to excite hot electrons, which allows for additional processes such as ­stimulated emission and could increase the efficiency

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