The interaction of an ultrashort intense laser pulse with a subwavelength rectangular grating target is studied by an analytical model and particle-in-cell simulations. Such interaction excites strong periodic charge separation at the grating surface. With the presence of formed electrostatic fields, the laser field can intensively heat electrons, causing near 100% light absorption. Its dependence on grating parameters is given. At low or moderate laser intensity, there are optimized sizes of grating gibbous cells and grooves as well as groove depths at which absorption maximums are found. At high intensity, the absorption is weakly affected by groove sizes and depths.
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Wang et al. (2008) studied this question.
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