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Plasmon-induced transparency in coupled triangle-rod arrays.

Guang Yuan Si1, Eunice Sok Ping Leong, Wei Pan

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We show polarization-dependent plasmon-induced transparency in coupled triangle-rod arrays. This phenomenon, arising from destructive interference, can be tuned by structural parameters for applications in metamaterials and biosensing.

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Metamaterials

Background:

  • Plasmon-induced transparency (PIT) is a quantum interference effect observed in nanostructures.
  • Coupled plasmonic systems offer unique optical properties due to inter-resonator coupling.

Purpose of the Study:

  • To demonstrate and investigate polarization-dependent plasmon-induced transparency in coupled triangle-rod arrays.
  • To explore the manipulation of PIT by controlling structural parameters.

Main Methods:

  • Fabrication of coupled triangle-rod arrays.
  • Experimental characterization of optical transmission spectra.
  • Numerical simulations using the finite-difference time-domain (FDTD) method.

Main Results:

  • Observed polarization-dependent plasmon-induced transparency.
  • Attributed the phenomenon to destructive interference between bright and dark resonators.
  • Demonstrated tunability of PIT by altering structural parameters.

Conclusions:

  • Coupled triangle-rod arrays exhibit tunable plasmon-induced transparency.
  • The findings support the design of artificial plasmonic molecules and metamaterials.
  • Potential applications include biosensing, nanoparticle trapping, and optical filters.