The optical nonlinear properties of an effective anisotropic slab made of metal-dielectric lamellar gratings with a small grating-period-to-wavelength ratioΛ/λ→0 is studied.It is shown that when a transverse magnet...The optical nonlinear properties of an effective anisotropic slab made of metal-dielectric lamellar gratings with a small grating-period-to-wavelength ratioΛ/λ→0 is studied.It is shown that when a transverse magnetic electromagnetic wave obliquely illuminates such a slab,whose effective normal permittivity is much smaller than its tangential one,the normal wave vector inside the effective medium is extremely sensitive to the fluctuation of the tangential effective permittivity.Based on this characteristic,obvious nonlinear modifications of the phase delay and step−like transmission are obtained by a moderate input intensity even if the thickness of the slab structure is only less thanλ/6.展开更多
基金by the National Natural Science Foundation of China under Grant No 10874129the National Basic Research Program of China under Grant No 2011CB922201.
文摘The optical nonlinear properties of an effective anisotropic slab made of metal-dielectric lamellar gratings with a small grating-period-to-wavelength ratioΛ/λ→0 is studied.It is shown that when a transverse magnetic electromagnetic wave obliquely illuminates such a slab,whose effective normal permittivity is much smaller than its tangential one,the normal wave vector inside the effective medium is extremely sensitive to the fluctuation of the tangential effective permittivity.Based on this characteristic,obvious nonlinear modifications of the phase delay and step−like transmission are obtained by a moderate input intensity even if the thickness of the slab structure is only less thanλ/6.
