ArticleNano letters2025
3D Imaging of Optical Modes in Dielectric Photonic Nanocavities with Sub-wavelength Field Confinement.
Article in Nano letters, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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10 authors.
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Abstract
Dielectric optical cavities are emerging as viable platforms for efficiently concentrating light within extremely small volumes of sub-wavelength dimensions. This breaks with the notion that only plasmonic nanostructures can achieve this scale of confinement and enables strong light-matter interactions without the losses typically associated with metals. Here, we directly visualize the optical modes of a topology-optimized silicon bowtie nanocavity using multi-orientation electron energy-loss spectroscopy. Tomographic reconstruction of the resulting data sets reveals the three-dimensional profiles of several polarized optical modes in close agreement with simulations. A resonance near the telecom wavelength (∼1550 nm) is shown to be tightly localized at the bowtie bridge, confirming its deep sub-wavelength mode volume. These findings establish electron beam spectroscopy as a powerful tool for mapping three-dimensional field confinement in dielectric photonic cavities with potential applications in future photonic and quantum technologies.
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