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Polarization-dependent Talbot effect

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Abstract

The term “polarization-dependent Talbot effect” means that the Talbot self-imaging intensity of a high-density grating is different for TE and TM polarization modes. Numerical simulations with the finite-difference time-domain method show that the polarization dependence of the Talbot images is obvious for gratings with period d between 2λ and 3λ. Such a polarization-dependent difference for TE and TM polarization of a high-density grating of 630linesmm (corresponding to dλ=2.5) is verified through experiments with the scanning near-field optical microscopy technique, in which a HeNe laser is used as its polarization is changed from the TE mode to the TM mode. The polarization-dependent Talbot effect should help us to understand more clearly the diffraction behavior of a high-density grating in nano-optics and contribute to wide application of the Talbot effect.

© 2006 Optical Society of America

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