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| Azevedo, Nuno Monteiro |
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Dionne, Jennifer A.
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Publications (7/7 displayed)
- 2024Highly confined epsilon-near-zero- and surface-phonon polaritons in SrTiO3 membranes
- 2022Lattice-Resolution, Dynamic Imaging of Hydrogen Absorption into Bimetallic AgPd Nanoparticles.citations
- 2021Dynamic lattice distortions driven by surface trapping in semiconductor nanocrystals.citations
- 2016Reconstructing solute-induced phase transformations within individual nanocrystalscitations
- 2015Probing Complex Reflection Coefficients in One-Dimensional Surface Plasmon Polariton Waveguides and Cavities Using STEM EELS.citations
- 2013Observation of Quantum Tunneling between Two Plasmonic Nanoparticlescitations
- 2012Quantum plasmon resonances of individual metallic nanoparticlescitations
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document
Highly confined epsilon-near-zero- and surface-phonon polaritons in SrTiO3 membranes
Abstract
Recent theoretical studies have suggested that transition metal perovskite oxide membranes can enable surface phonon polaritons in the infrared range with low loss and much stronger subwavelength confinement than bulk crystals. Such modes, however, have not been experimentally observed so far. Here, using a combination of far-field Fourier-transform infrared (FTIR) spectroscopy and near-field synchrotron infrared nanospectroscopy (SINS) imaging, we study the phonon-polaritons in a 100 nm thick freestanding crystalline membrane of SrTiO3 transferred on metallic and dielectric substrates. We observe a symmetric-antisymmetric mode splitting giving rise to epsilon-near-zero and Berreman modes as well as highly confined (by a factor of 10) propagating phonon polaritons, both of which result from the deep-subwavelength thickness of the membranes. Theoretical modeling based on the analytical finite-dipole model and numerical finite-difference methods fully corroborate the experimental results. Our work reveals the potential of oxide membranes as a promising platform for infrared photonics and polaritonics.