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Metallic nanostructures facilitate analyte sensing through localization of surface plasmons. In this work, we demonstrate that the same metal nanostructures can also facilitate the concentration and localization of analyte at the active sensing surface. Specifically, the structure of flow-through plasmonic nanohole array sensors presents the opportunity of locally increasing analyte concentration...
This work presents a multi-component chip that: (i) traps settling cells into poly(dimethyl siloxane) microwells; and (ii) senses the binding of antibodies to antigen immobilized onto a gold surface via the surface plasmon resonance shifts of milled nanohole arrays. We have previously detected the 17/9 antibodies secreted by ~200 hybridoma cells/trap. This work demonstrates our system's current capabilities...
Quasicrystal arrays show a rotationally symmetric diffraction pattern that can be oriented with the polarization. A comprehensive electromagnetic theory agrees with the observed transmission spectrum and diffraction, and it shows near-field hot-spots.
The second harmonic generation from a non-centrosymmetric nanostructure in gold film is studied comprehensively. The sunglass aperture shape is chosen to have an apex to increase the local field.
A subwavelength aperture array in a gold film is fabricated for the purpose of second harmonic generation (SHG). The sunglass aperture shape is chosen to have an apex to increase the local field; however, unlike past research on double-hole structures, the inversion symmetry of the structure is intentionally broken to enhance the SHG. A systematic study of the influence of array periodicity and aperture...
The cusps formed by two barely overlapping nanoholes in a metal film enhance the local field and allow for order of magnitude surface-enhanced Raman over single holes.
The transmission through random subwavelength rectangular apertures in a gold film is studied. Enhanced loss is shown to arise from localization of light at the surface of the film, which increases with aperture density.
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