Accurate Analysis of Light Scattering and Absorption by an Infinite Flat Grating of Thin Silver Nanostrips in Free Space Using the Method of Analytical Regularization

作者：Zinenko Tatiana L^*; Marciniak Marian; Nosich Alexander I

来源：IEEE Journal of Selected Topics in Quantum Electronics, 2013, 19(3): 9000108.

DOI：10.1109/JSTQE.2012.2227685

• Absorption
• generalized boundary conditions (GBC)
• grating
• resonances
• scattering
• silver nanostrip

We study the plane wave scattering and absorption by a flat grating of thin silver nanostrips located in free space, in the visible-light range. The formulation involves generalized boundary conditions imposed on the strip median lines. We use an accurate numerical solution to this problem based on the dual-series equations and the method of analytical regularization. This guarantees fast convergence and controlled accuracy of computations. Reflectance, transmittance, and absorbance as a function of the wavelength and the grating parameters are analyzed. In addition to well-known surface-plasmon resonances, sharp resonances are revealed in the H-polarized scattering near but not equal to the Rayleigh wavelengths of nonzero diffraction orders; in the E-polarized scattering these resonances are not visible. Asymptotic formulas for the frequencies and natural fields of the grating resonances are presented.

• 出版日期2013-6