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Bypassing Nonlocal Phenomena in Metals Using Phonon-Polaritons.

Jacob T Heiden1, Eduardo J C Dias2, Minhyuk Kim3

  • 1School of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.

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|November 19, 2025
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Summary
This summary is machine-generated.

Researchers explored nanolight confinement using hexagonal boron nitride (hBN) and gold, bypassing nonlocal effects. This work enables advanced electromagnetic designs by overcoming limitations in light-matter interactions.

Keywords:
nanophotonicsnear-field optical microscopynonlocalitypolaritonicsvan der Waals materials

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Area of Science:

  • Condensed Matter Physics
  • Nanophotonics
  • Materials Science

Background:

  • Electromagnetic design requires understanding light-matter interactions, but electronic length scales are often neglected.
  • Neglecting these scales can cause nonclassical effects like nonlocal response under extreme light confinement.

Purpose of the Study:

  • To investigate nanolight confinement using mid-infrared phonon-polaritons in hexagonal boron nitride (hBN) screened by monocrystalline gold.
  • To overcome limitations imposed by nonlocal phenomena in van der Waals heterostructures.
  • To explore a pathway for bypassing nonlocal effects in high-confinement regimes.

Main Methods:

  • Utilized mid-infrared phonon-polaritons in hexagonal boron nitride (hBN).
  • Employed monocrystalline gold flakes for screening.
  • Applied near-field imaging to probe polaritons in nanometer-thin hBN crystals on gold.
  • Extracted the complex propagation constant of the polaritons.

Main Results:

  • Achieved nanolight confinement unobstructed by nonlocal phenomena, even at high polariton velocities.
  • Observed effective indices exceeding 94 for the polaritons.
  • Identified a naturally forming thin low-index interfacial layer on monocrystalline gold, highlighting the importance of sample characterization.

Conclusions:

  • Demonstrated a method to bypass nonlocal effects in van der Waals heterostructures for advanced electromagnetic designs.
  • Highlighted the critical role of sample characterization in nanophotonic experiments.
  • Opened new avenues for pushing the limits of light confinement in nanophotonic systems.