Yuge Han

Numerical investigation on the spectral properties of roughness surface by FDTD method

It is well known that thermal spectral properties may be altered substantially due to roughness of a microstructure surface. This paper is aimed at attempting to develop the Finite Difference Domain Time (FDTD) algorithm to simulate the photo propagation on roughness surface and calculate its spectral properties. The Maxwell equations are transformed to the finite difference expressions with central difference conducted by so-called Yee cell, and the field split technique is employed to get scatter field FDTD expressions directly. Finally, three types of microstructure surface are involved in the numerical simulation to test the developed FDTD algorithm.

Numerical Study on Spectral Properties of MIM (AG/MGF2/AG) Structure With Periodic Rectangular Holes

Spectral properties of metal/insulator/metal (MIM) structure with two-dimensional-hole arrays (2DHAs) are investigated by using the finite-difference time-domain (FDTD) method. The effects of the period, the hole ratio, the thickness of front layer and core layer, and the incident angle as well as the polarization angle on the spectral properties of structured surfaces are studied. It is found that extraordinary optical transmission (EOT) can be excited by the combined effect of waveguide cutoff function and surface plasmon polaritons (SPPs). For some special structure parameters, the MIM structure shows strong absorption of incident wave due to odd mode of SPPs and Fabry–Perot resonance at the sub-wavelength region and relatively longer wavelength region, respectively. These results provide guide information for the application of MIM structure to the EOT devices, absorbers or radiators.Copyright