| 초록 |
Enhanced light absorption by a textured surface with sub-wavelength structures has drawn much attention due to great potential in various engineering applications, such as biosensing, energy conversion, and photothermal manufacturing. This work provides theoretical analysis of the spectral absorptivity of the surface with a tandem grating composed of several metal-insulator-metal elements for solar energy harvesting application. A tandem grating can be regarded geometrically as a complex grating that has several grating elements in a single unit cell if the lateral positions of grating elements in each layer are staggered. Although resonance phenomena, such as surface plasmon and magnetic resonance, are well known for simple grating structures, few studies have investigated the electromagnetic resonance modes in staggered tandem grating structures as well as their impacts on the spectral absorptivity. Physical mechanisms of the absorption enhancement will be elucidated with the numerical simulations based on the finite-difference time-domain method. |
