Object distance-independent near-field subwavelength imaging of metal waveguide arrays

摘要

A prism-shape microlens constructed with two-dimensional nanoscale metal waveguide arrays (MWGAs) is introduced for near-field subwavelength imaging. Finite-difference time-domain numerical simulations reveal that the microlens shows interesting object distance-in dependent subwavelength imaging as the object distance ranges from 100 nm to 1000 nm and the concave angle of the prism-shape lens is less than 150 degrees. The possibility of using such microlens for array microimaging is also demonstrated. The microlens may provide potential applications in nanophotonics, lithography, and superresolution imaging. (C) 2008 Optical Society of America