Chinese Optics Letters, 2006, 4 (1): 0152, Published Online: Jun. 6, 2006
Optical transmission enhancement by a sub-wavelength film lens
Abstract
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 greatly 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.
Fei Zhou, Wendong Xu, Yang Wang, Fuxi Gan. Optical transmission enhancement by a sub-wavelength film lens[J]. Chinese Optics Letters, 2006, 4(1): 0152.