Nonlinear plasmonic antennas

Shakeeb Bin Hasan, Falk Lederer, Carsten Rockstuhl
2014 Materials Today  
Contrary to traditional optical elements, plasmonic antennas made from nanostructured metals permit the localization of electromagnetic fields on length scales much smaller than the wavelength of light. This results in huge amplitudes for the electromagnetic field close to the antenna being conducive for the observation of nonlinear effects already at moderate pump powers. Thus, these antennas exhibit a promising potential to achieve optical frequency conversion and all-optical control of light
more » ... at the nano-scale. This opens unprecedented opportunities for ultrafast nonlinear spectroscopy, sensing devices, on-chip optical frequency conversion, nonlinear optical metamaterials, and novel photon sources. Here, we review some of the recent advances in exploiting the potential of plasmonic antennas to realize robust nonlinear applications. A pair of meta-surfaces formed by center-fed half-wavelength antennas for 'perfect' imaging. (a) Schematic of a single center-fed antenna array with signal and pump illuminations. The inset shows the geometry of the single antenna. (b) Schematic of phase conjugating meta-surfaces together with pump illumination directions. (c) Comparison of the imaged field of the source for various separation distances between the two surfaces. The solid black curve displays the sub-wavelength source field distribution, whereas the black dashed curve shows its diffracted field at image plane without meta-surfaces. Figures adapted from Ref. [79].
doi:10.1016/j.mattod.2014.05.009 fatcat:jzuqtwbfnfavphxi4hejioq32q