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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters
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Electrical addressing of exceptional points in compact plasmonic structures.

Hoon Yeub Jeong1, Yeonsoo Lim1, Jungho Han1

  • 1Department of Materials Science and Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary
This summary is machine-generated.

Researchers demonstrate electrically addressable exceptional points (EPs) in compact plasmonic structures. This breakthrough allows for precise control of optical sensitivity and opens new avenues for tunable integrated photonic devices.

Keywords:
coupled resonant modeselectrical controlexceptional pointintegrated device platformlocalized spoof plasmon resonator

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Area of Science:

  • Photonics
  • Plasmonics
  • Non-Hermitian physics

Background:

  • Exceptional points (EPs) are degenerate singularities in non-Hermitian systems, crucial for enhancing optical sensitivity.
  • Previous research on EPs was largely confined to static photonic structures.
  • Controlling interactions between resonant photonic modes is key to inducing EPs.

Purpose of the Study:

  • To propose and experimentally demonstrate an electrically addressable exceptional point (EP) in a plasmonic structure.
  • To investigate the electrical control of coupled plasmonic modes for EP realization.
  • To explore the potential of EPs in compact, tunable integrated photonic devices.

Main Methods:

  • Utilized a localized spoof plasmon structure supporting circulating plasmonic modes.
  • Employed an angled metal line to perturb plasmonic modes and a varactor for electrical control.
  • Performed numerical simulations to analyze eigenmodes and coupling, followed by experimental spectral measurements.

Main Results:

  • Demonstrated simultaneous coalescence of the real and imaginary parts of eigenfrequencies via electrical tuning.
  • Experimentally verified the coalescence of two resonant modes in both resonance frequency and linewidth.
  • Showcased electrically addressable EPs in a compact, single-resonator plasmonic geometry.

Conclusions:

  • Electrically addressable EPs have been successfully realized in a compact plasmonic structure.
  • This work enables dynamic control over EP phenomena in plasmonic systems.
  • The findings offer significant potential for developing highly functional and tunable elements in integrated photonic platforms.