摘要
A new sub-wavelength metallic film lens configuration is proposed, which is embedded in a thin ideal metal film, and its near field optical properties are investigated by finite-difference time-domain （FDTD） method. It is found that the optical transmission is greath enhanced, and the spot size can be reduced by the sub-wavelength metallic film lens in comparison with the bare aperture. This kind of lens is expected to have practical applications in the very small aperture laser （VSAL）, a promising nanosource for near-field optical storage and lithography.
A new sub-wavelength metallic film lens configuration is proposed, which is embedded in a thin ideal metal film, and its near field optical properties are investigated by finite-difference time-domain （FDTD） method. It is found that the optical transmission is greath enhanced, and the spot size can be reduced by the sub-wavelength metallic film lens in comparison with the bare aperture. This kind of lens is expected to have practical applications in the very small aperture laser （VSAL）, a promising nanosource for near-field optical storage and lithography.
基金
This work was supported by the Science and Technology Committee of Shanghai (No. 02ZF14109, 022261045,03QG14057, and 0359NM003)the National Natural Science Foundation of China(No. 60207005)the National "863" Project of China(No. 2002AA313030)
