Porous anodic alumina waveguide plasmon sensors: influence of structural parameters on sensing performance
Source abstract
Abstract
Abstract A comparative study of thin porous anodic alumina (PAA) plasmonic sensors is presented. Coupled plasmon–waveguide resonance spectroscopy and scanning electron microscopy are employed to investigate the structural parameters governing the sensing performance of PAA-based waveguide configurations. Partial electrochemical anodization of thin aluminum films deposited on glass substrates produces an Al/Al₂O₃ interface that supports surface electromagnetic modes, while the resulting porous anodic alumina layer provides enhanced detection efficiency mainly due to its increased active surface area. The influence of key geometrical parameters - namely PAA thickness, pore radius, and porosity - on the optical response of the sensor is systematically examined, and corresponding calibration curves are established. In addition, Bruggeman effective medium theory is applied to model the effective dielectric properties of the porous layer and to fit in situ reflectance measurements during pore widening. The quantitative agreement between optical modeling and independent morphological SEM characterization demonstrates that this approach provides a framework for quantifying mass adsorption in porous waveguide plasmon sensors, yielding sensitivities exceeding those of conventional planar SPR sensors.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Anodic Oxide Films and Nanostructures · Plasmonic and Surface Plasmon Research · Gold and Silver Nanoparticles Synthesis and Applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
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