The Talbot effect of a grating with different kinds of flaws is analyzed with the finite-difference time-domain (FDTD) method. The FDTD method can show the exact near-field distribution of different flaws in a high-density grating, which is impossible to obtain with the conventional Fourier transform method. The numerical results indicate that if a grating is perfect, its Talbot imaging should also be perfect; if the grating is distorted, its Talbot imaging will also be distorted. Furthermore, we evaluate high-density gratings by detecting the near-field distribution with the scanning near-field optical microscopy technique. Experimental results are also given.
© 2005 Optical Society of America
(050.1950) Diffraction and gratings : Diffraction gratings
(070.6760) Fourier optics and signal processing : Talbot and self-imaging effects
(260.2110) Physical optics : Electromagnetic optics
Fourier Optics and Optical Signal Processing
Yunqing Lu, Changhe Zhou, and Hongxin Luo, "Talbot effect of a grating with different kinds of flaws," J. Opt. Soc. Am. A 22, 2662-2667 (2005)