Maximizing Infrared Extinction Coefficients for Metal Discs, Rods, and Spheres.

摘要

Infrared spectral extinction coefficients, extinction cross sections per volume of material, are computed for metal disks, rods, and spheres as a function of dimensions, conductivity, and wavelength. Computations for rods use a combination of infinite cylinder and Rayleigh finite and perfectly conducting prolate spheroid scattering theories. Disk computations use a combination of diffraction, thin film optics, Rayleigh finite, and perfectly conducting oblate spheroid scattering theories. Sphere computations use a combination of Geometric Optics, Anomalous Diffraction, and Rayleigh scattering theories. Complex conductivities are predicted as a function of wavelength using the Drude model along with thin wire and thin film models for boundary limited electron mean free path. Spectral extinction coefficients are maximized using surface plots to identify optimal ranges for particle dimensions and conductivities at a particular wavelength.