AI Article Synopsis
- Researchers have created arrays of tiny plasmonic nanocavities with very low volumes, using a technique called soft UV nanoimprint lithography.
- The fundamental mode of these cavities shows nearly perfect omnidirectional absorption for light at approximately 1.15 μm across a wide range of angles (3-70°).
- The second-order mode, which becomes highly resonant under specific conditions, demonstrates excellent sensitivity for refractive index changes, suggesting potential for improved biosensing in extremely small sample volumes.
Article Abstract
Arrays of plasmonic nanocavities with very low volumes, down to λ(3)/1000, have been fabricated by soft UV nanoimprint lithography. Nearly perfect omnidirectional absorption (3-70°) is demonstrated for the fundamental mode of the cavity (λ ≃ 1.15 μm). The second-order mode exhibits a sharper resonance with strong angular dependence and total optical absorption when the critical coupling condition is fulfilled (45-50°, λ ≃ 750 nm). It leads to high refractive index sensitivity (405 nm/RIU) and figure of merit (∼21) and offers new perspectives for efficient biosensing experiments in ultralow volumes.
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| http://dx.doi.org/10.1021/nl201004c | DOI Listing |
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