FDTD simulation of various thickness PAAO with 20 nm Au film in different mediums (AoI 45 deg., s-polarization)

<p>FDTD software: Lumerical (Ansys, version 2021 R2.3).</p> <p>Structure: aluminum (Palik) substrate; 250/280/310/340/370/400 nm thickness (<em>h</em>e) aluminum oxide (Palik) layer with 35 nm diameter (<em>RPo</em>) cylindrical pores with 100 nm&nbsp;distance (<em>D</em>) between the pore centers (representing porous anodized aluminum oxide - PAAO); 20 nm thickness (<em>hA</em>) gold (Johnson and Christy) layer. The pores extend through both PAAO and Au layers as it was observed in SEM images.</p> <p>Refractive index of the surrounding medium (<em>n</em>): 1.0; 1.1; 1.2; 1.3; 1.32; 1.33; 1.34.</p> <p>Simulation region: from 100 nm below the substrate/PAAO interface to 700 nm above gold film surface; x and y spans are equal to one period of the structure.</p> <p>Mesh override region: from 30 nm below the PAAO to 30 nm above Au; 2 nm step size in each direction.</p> <p>Light source: BFAST plane wave light source; 250 nm above Au film; 45&deg; angle of incidence (<em>ang</em>); 300 nm &ndash; 1000 nm wavelength range; s-polarization (<em>pol</em>).</p> <p>Monitor (frequency domain field and power): 2D Z-normal; 500 nm above Au; results are in &quot;<em>_reflection.txt</em>&quot; files.</p> <p>Information in the file name: <em>he</em> - thickness of PAAO; <em>pol</em> - polarization; <em>hA</em> - thickness of Au film; <em>RPo</em> - diameter of pores; <em>D</em> - distance between pore centers; <em>ang</em> - angle of incidence; <em>n</em> - refractive index of surrounding medium.</p> <p>Files: (1) &quot;<em>_reflection.txt</em>&quot; - lambda(nm) (first column) - wavelength in nanometers; Y (second column) - T data from the monitor above the structure. (2) &quot;<em>_p0.log</em>&quot; - log file produced by the software while running the simulation. (3) &quot;<em>.fsp</em>&quot; - Lumerical software file containing the simulation project (license required to open these files). (4) &quot;<em>Lumerical_Screenshots.pdf</em>&quot; - shows software screenshots for every object and its every property; red text is added to show which values are different for different simulations. (5) &quot;<em>Structure_Illustration.jpg</em>&quot; - a schematic of modeled structure. (6) &quot;<em>.jpg</em>&quot; - a preview of data from &quot;<em>_reflection.txt</em>&quot; files.</p>