Parts | Days | Selection | Search | Updates | Downloads | Help

O: Fachverband Oberflächenphysik

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

O 34.60: Poster

Tuesday, March 27, 2012, 18:15–21:45, Poster E

Far-field control of optical near-field enhancement — •Riko Kießling, David Leipold, and Erich Runge — Technische Universität Ilmenau, 98693 Ilmenau, Germany

Controlling optical near-fields by shaping the temporal envolope of an incoming far-field laser pulse is a new and interesting topic with most promising applications in optical nano-circuitry. Recent experiments proof the possibility to tailor the near-fields in an arrangement of nano-antennas spatially and temporally [1].

In this theoretical work, we study how strong the fields near one out of some randomly arranged nano-anntennas can be enhanced. We quantify the relative near-field enhancement dependent on the number of far-field degrees of freedom allowed in the optimization. In particular, we consider superpositions of incident plane-waves with different frequencies, directions and polarizations. For this purpose, we explore a huge configuration space with a discrete-dipole approximation (DDA). DDA calculations are numerically cheap and inherently well suited for sytems of small antennas. The optimization itself is then performed semi-analytically.

[1] M. Aeschlimann, et. al, PNAS 107, 5333 (2010)