FDTD simulation of PAAO with gold nanoparticles: varying thickness, s-polarization

FDTD software: Lumerical (Ansys, version 2021 R2.3).

Structure: aluminum (Palik) substrate; varying thickness (from 230 nm to 350 nm) aluminum oxide (Palik) layer with 35 nm diameter cylindrical pores with 100 nm distance between the pore centers (representing porous anodized aluminum oxide - PAAO); 60 nm diameter gold (Johnson and Christy) nanoparticles placed directly above each pore.

Refractive index of the surrounding medium: 1.

Simulation region: from 300 nm below the substrate/PAAO interface to 1.3 µm above PAAO surface; x and y spans are equal to one period of the structure.

Mesh override region: from 50 nm below the PAAO to 50 nm above the nanoparticles; 2 nm step size in each direction.

Light source: BFAST plane wave light source; 500 nm above PAAO; 45° angle of incidence; 300 nm – 1000 nm wavelength range; s-polarization.

Monitors: frequency domain field and power monitor; 1 µm above PAAO; T result from the monitor.

Information in the file name: h - thickness of PAAO; pol - polarization; RNP - diameter of gold nanoparticles; RPo - diameter of pores; D - distance between pore centers; ang - angle of incidence.

Information inside the file: lambda(nm) (first column) - wavelength in nanometers; Y (second column) - T data from the monitor.