Microwave resonances in aqueous spherical dimers

Yuchen Song; Miao Hu; Shima Nikkhah; Aaron D. Slepkov

doi:10.1117/12.3000420

13 March 2024 Microwave resonances in aqueous spherical dimers

Yuchen Song, Miao Hu, Shima Nikkhah, Aaron D. Slepkov

Proceedings Volume PC12901, Complex Light and Optical Forces XVIII; PC129010I (2024) https://doi.org/10.1117/12.3000420
Event: SPIE OPTO, 2024, San Francisco, California, United States

Abstract

With an index of refraction approaching 9 at microwave frequencies, water is a high-index dielectric material suitable for studying morphology-dependent resonance (MDR) analogs of metallic plasmonic hotspots. We use experimental, analytical, and computational approaches to study MDRs in aqueous dimers, paying particular attention to formation of evanescent axial hotspots. We use hydrogel beads and thermal imaging, along with FEM simulations to explore polarization, orientation, and size-dependence in MDR hybridization. A novel analytical approach involving vectorial addition of spherical harmonics of monomer MDRs provides geometric insight into which modes most strongly interact to yield strong subwavelength electromagnetic hotspots in aqueous bispheres.

Conference Presentation

Citation Download Citation

Yuchen Song, Miao Hu, Shima Nikkhah, and Aaron D. Slepkov "Microwave resonances in aqueous spherical dimers", Proc. SPIE PC12901, Complex Light and Optical Forces XVIII, PC129010I (13 March 2024); https://doi.org/10.1117/12.3000420

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