Berlin 2012 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 34: Poster Session I (Graphene; Plasmonics and nanooptics; Coherence and coherent control in nanophotonics and plasmonics)

O 34.31: Poster

Dienstag, 27. März 2012, 18:15–21:45, Poster E

Multi-wavelength superlensing with layered phonon-resonant dielectric — •Peining Li and Thomas Taubner — I. Institute of Physics (IA), RWTH Aachen University, Sommerfeldstraße 14, 52074 Aachen, Germany

A superlens is a very promising device to overcome the diffraction limit and resolve subwavelength features [1]. However, the practical application of the superlens is limited by its narrow bandwidth since a superlensing condition should be met. For dispersive materials, this condition limits operation to a very small wavelength range for each material system. For example, the superlensing condition for the silicon carbide (SiC) case is met at a wavelength of around 11 μm [2]. Therefore, in order to cover a relatively wide wavelength range, different superlenses should be used [3].

Here, we theoretically propose a possibility of employing a multilayered polar-dielectric system to achieve sub-diffraction limited imaging at different wavelengths. Our theory and simulation results show that this multilayered lens can fulfill the superlensing condition at multiple different wavelengths simultaneously due to the phonon resonances of polar dielectrics, and the number of superlensing wavelengths of the lens can be easily tuned by controlling the number of polar dielectrics. Ideally, by suitably choosing the polar dielectrics, the wavelength range of our lens can cover from infrared to THz frequencies.