Dresden 2017 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 69: Plasmonics and Nanooptics VI: Light-Matter Interactions and Characterisation

O 69.3: Vortrag

Mittwoch, 22. März 2017, 11:00–11:15, TRE Ma

Optical properties of hybrid chiral plasmonic systems — •Martin Schäferling, Maxim L. Nesterov, Xinghui Yin, Harald Giessen, and Thomas Weiss — 4th Physics Institute and Research Center SCoPE, University of Stuttgart, Germany

Chiroptical spectroscopy is a vital technique in the life sciences. The combination of chiral media with plasmonic nanostructures offers a possibility to enhance the tiny chiroptical responses. Theoretical studies of such hybrid systems are necessary to understand the occurring interactions. A well-established method to investigate the potential interaction strength between plasmonic nanostructures and a chiral molecule is the analysis of chiral near-fields [1]. This method works for the presence of a few molecules in the limit of weak coupling. However, in systems where a sizeable amount of a chiral medium is present, additional effects beyond the capabilities of this model can occur.

In this contribution, we analyze the full hybrid system combining plasmonic nanostructures with chiral media. In one approach, we use numerical full-wave simulations where we introduced an effective chiral medium via its constitutive equations. Our results reveal the importance of coplanarity of the incident field with the generated near-field in addition to strong field enhancement [2]. Additionally, we show first results of a semi-analytical approach using perturbation theory [3] to analyze the influence of a chiral medium on plasmonic resonances.

[1] M. Schäferling et al., Phys. Rev. X 2, 031010 (2012).

[2] M. L. Nesterov et al., ACS Photonics 3, 578 (2016).

[3] T. Weiss et al., Phys. Rev. Lett 116, 237401 (2016).