Electromagnetic analysis of diffraction gratings by the finite-difference time-domain method

摘要

Diffraction gratings with feature sizes comparable to the wavelength are analyzed with a finite-difference time-domain method, which is a unique approach to electromagnetic problems in the time domain. The diffraction efficiencies obtained are in good agreement with other commonly used numerical methods in the frequency domain. As a further application, diffraction problems with pulsed light are also investigated. # 1998 Optical Society of America [S0740-3232(98)02101-2] OCIS codes: 050.1950, 050.1970, 050.1960, 260.2110.