High-resolution perfect imaging of micro/nanojet

Abstract

A systematic theoretical study on elimination of imaging distortion for realization of perfect imaging of a micro/nanojet in THz, visible and infrared regions has been performed on the basis of a two-layer structure formed by an exterior hexagonal prism and a cuboid (cube) or cylinder embedded in it. The study concentrates on effects of scatterer’s geometry, propagation direction and polarization characteristics on ellipticity of the micro/nanojet. The geometry of scatterer involves height, side length, relative position of the exterior and interior layers. The study shows that imaging distortion can be eliminated in all spectral regions considered, and perfect images with an ellipticity of ∼ 1.0 can be obtained on the basis of an optimal scatterer structure proposed. Meanwhile, high wave intensity (I/I0 > 23) and high imaging resolution (<0.30λ) beyond the diffraction limit are expected. The study also shows that the imaging and hence the morphology of micro/nanojet shows considerable effects of polarization state and direction of incident wave, and the effects are associated with both structure features of scatterer and polarization characteristics of incident wave. The perfect imaging of micro/nanojet shows great potential for its application in the field of high-resolution imaging at different frequency regions.

Keywords

• Micro/nanojet
• Perfect imaging
• High-resolution
• Elimination of imaging distortion