Paper
Circular V-grooves on single-crystal gold: optical properties and sensing feasibility
Authors
Amos Sospeter Kiyumbi
Abstract
Single-crystal Au(111) microplates provide an ultra-smooth, low-defect platform for reproducible plasmonic nanocavities. Here we realize reflection-mode whispering-gallery metasurfaces comprising periodic arrays of circular V-groove cavities milled into optically thick Au microplates and characterize their visible--near-IR response. The measured spectra exhibit narrow, depth-tunable Fano-like reflectance minima with weak azimuthal dependence, reproduced by quarter-cell finite-element modeling consistent with strong gap-surface-plasmon confinement. For refractometric sensing, simulations yield bulk sensitivities up to $\sim 598$ nm RIU$^{-1}$ and figures of merit up to $\sim 33$ (hexagonal lattice). As a model-based illustration, a functionalized architecture targeting \textit{Plasmodium falciparum} lactate dehydrogenase (PfLDH), a common malaria target of rapid diagnostic tests, gives an estimated limit of detection of $0.016$ nM ($\sim 0.56$ ng mL$^{-1}$) under the adopted noise floor.
Metadata
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"raw_xml": "<entry>\n <id>http://arxiv.org/abs/2602.19665v1</id>\n <title>Circular V-grooves on single-crystal gold: optical properties and sensing feasibility</title>\n <updated>2026-02-23T10:13:01Z</updated>\n <link href='https://arxiv.org/abs/2602.19665v1' rel='alternate' type='text/html'/>\n <link href='https://arxiv.org/pdf/2602.19665v1' rel='related' title='pdf' type='application/pdf'/>\n <summary>Single-crystal Au(111) microplates provide an ultra-smooth, low-defect platform for reproducible plasmonic nanocavities. Here we realize reflection-mode whispering-gallery metasurfaces comprising periodic arrays of circular V-groove cavities milled into optically thick Au microplates and characterize their visible--near-IR response. The measured spectra exhibit narrow, depth-tunable Fano-like reflectance minima with weak azimuthal dependence, reproduced by quarter-cell finite-element modeling consistent with strong gap-surface-plasmon confinement. For refractometric sensing, simulations yield bulk sensitivities up to $\\sim 598$ nm RIU$^{-1}$ and figures of merit up to $\\sim 33$ (hexagonal lattice). As a model-based illustration, a functionalized architecture targeting \\textit{Plasmodium falciparum} lactate dehydrogenase (PfLDH), a common malaria target of rapid diagnostic tests, gives an estimated limit of detection of $0.016$ nM ($\\sim 0.56$ ng mL$^{-1}$) under the adopted noise floor.</summary>\n <category scheme='http://arxiv.org/schemas/atom' term='physics.optics'/>\n <published>2026-02-23T10:13:01Z</published>\n <arxiv:comment>13 pages, 8 figures</arxiv:comment>\n <arxiv:primary_category term='physics.optics'/>\n <author>\n <name>Amos Sospeter Kiyumbi</name>\n </author>\n </entry>"
}