We present nanostructured gold films ⎯ with complex plasmonic nanostructures present on the surface of the films ⎯ for enhanced SPR-based sensing and imaging of biomolecules attached to the surface of these films. We employed rigorous coupled wave analysis (RCWA) for simulating the nanostructured plasmonic gold films. In our simulations, surface plasmon polaritons were excited on the surface of the nanostructured gold films using the Kretschmann configuration. We observe that these nanostructured gold films show a significant enhancement in the sensitivity of SPR sensing and imaging of biomolecules as compared to planar gold films when optimal geometries and sizes of the plasmonic nanostructures (present on the surface of the gold film) are employed.
We propose plasmonic nanogratings such that they have tunable plasmon resonances in far- and deep-UV wavelength ranges. These plasmonic nanostructures and nanogratings of different plasmonic materials have been simulated using Finite Difference Time Domain modeling and the Rigorous Coupled Wave Analysis. Application of these plasmonic nanostructures for surface plasmon resonance and localized surface plasmon resonance based sensing in the UV wavelength regime has been demonstrated by calculating the shifts in the plasmon resonance wavelength for changes in either the bulk refractive index or the localized refractive index of the medium next to the plasmonic structures.
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