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Dipole modelling for a robust description of subdiffractional polariton waves.
Flávio H Feres1, Ingrid D Barcelos2, Rafael A Mayer3
1Brazilian Synchrotron Light Laboratory (LNLS), Brazilian Center for Research in Energy and Materials (CNPEM), Zip Code 13083-970, Campinas, Sao Paulo, Brazil. francisco.maia@lnls.br and Physics Department, Institute of Geosciences and Exact Sciences, São Paulo State University - UNESP, Rio Claro 13506-900, Brazil.
Nanoscale
|October 31, 2019
Summary
We developed a Hertzian dipole antenna model to precisely describe hyperbolic phonon polaritons in van der Waals materials. This model accurately predicts polariton behavior and confinement, aiding nanophotonics research.
Area of Science:
- Condensed Matter Physics
- Nanophotonics
- Materials Science
Background:
- Nanophotonics in van der Waals (vdW) materials depends on sub-diffraction scale polariton properties.
- Hexagonal boron nitride (hBN) exhibits hyperbolic phonon polaritons (HP²s) crucial for vdW nanophotonics.
Purpose of the Study:
- To model hyperbolic phonon polaritons (HP²s) in vdW materials using a Hertzian dipole antenna (HDA) model.
- To investigate and validate the electromagnetic properties of HP²s in hBN on a gold surface.
Main Methods:
- Utilized a full electromagnetic Hertzian dipole antenna (HDA) model.
- Employed broadband synchrotron infrared nanospectroscopy (SINS) to study HP² waves.
- Incorporated optical-near field theory into the HDA model for simulations.
Main Results:
- HDA model accurately predicted polariton momenta and damping, showing excellent agreement with theory.
- Type I HP²s exhibited a confinement factor up to 3 times greater than type II.
- Extracted anti-parallel group velocities and lifetimes for type I and type II HP²s.
Conclusions:
- The HDA model self-consistently explains measured polariton near-fields.
- This general approach is applicable to various polariton types (plasmon, exciton) in vdW materials.
- The HDA model offers a computationally efficient method for simulating polaritonic phenomena.
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