Surface quantum response of plasmonic heterodimers: revealing the hidden nonlocality
Abstract
We probe the quantum response of plasmonic heterodimers with extended (plane waves) and localized (point dipoles and electron beams) sources. Implementing the surface-response formalism based on Feibelman parameters, we explore nanosphere heterodimers where one particle is characterized by electron spill-in, while the other by spill-out. We identify situations where the two quantum surface corrections that act in opposite spectral-shift directions can cancel out, producing mesoscopic spectra that do not differ from the predictions of the local-response approximation. This picture changes dramatically once localized sources are implemented, allowing one to selectively probe the quantum response of the particles independently. Such probing occurs in terms of higher-order modes in the case of electron beams, or for the complete modal landscape in the case of point dipole sources. This description offers a new insight into the mechanisms governing light--matter interactions in extreme plasmonic architectures, and opens new perspectives for the understanding and tailoring of plasmonic--quantum emitter architectures.
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BibTeX
@misc{bundgaard2026surface,
title = {{Surface quantum response of plasmonic heterodimers: revealing the hidden nonlocality}},
author = {Ida Juliane Bundgaard and Christos Mystilidis and Frederik Wulff Christensen and Lorenz Huber and P. Elli Stamatopoulou and Carsten Rockstuhl and P. A. D. Gonçalves and Ulrich Hohenester and N. Asger Mortensen and Christos Tserkezis},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.38870},
eprint = {2609.38870},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.38870},
}
RIS
TY - UNPB
TI - Surface quantum response of plasmonic heterodimers: revealing the hidden nonlocality
AU - Ida Juliane Bundgaard
AU - Christos Mystilidis
AU - Frederik Wulff Christensen
AU - Lorenz Huber
AU - P. Elli Stamatopoulou
AU - Carsten Rockstuhl
AU - P. A. D. Gonçalves
AU - Ulrich Hohenester
AU - N. Asger Mortensen
AU - Christos Tserkezis
PY - 2026
DA - 2026/09/30
PB - arXiv
DO - 10.48550/arxiv.2609.38870
UR - https://arxiv.org/abs/2609.38870
AB - We probe the quantum response of plasmonic heterodimers with extended (plane waves) and localized (point dipoles and electron beams) sources. Implementing the surface-response formalism based on Feibelman parameters, we explore nanosphere heterodimers where one particle is characterized by electron spill-in, while the other by spill-out. We identify situations where the two quantum surface corrections that act in opposite spectral-shift directions can cancel out, producing mesoscopic spectra that do not differ from the predictions of the local-response approximation. This picture changes dramatically once localized sources are implemented, allowing one to selectively probe the quantum response of the particles independently. Such probing occurs in terms of higher-order modes in the case of electron beams, or for the complete modal landscape in the case of point dipole sources. This description offers a new insight into the mechanisms governing light--matter interactions in extreme plasmonic architectures, and opens new perspectives for the understanding and tailoring of plasmonic--quantum emitter architectures.
ER -