Journal
NANOPHOTONICS
Volume 9, Issue 10, Pages 3419-3434Publisher
WALTER DE GRUYTER GMBH
DOI: 10.1515/nanoph-2020-0130
Keywords
chiral plasmonics; circular dichroism; plasmon hybridization; plasmonic metamolecule; surface lattice resonance
Categories
Funding
- National Natural Science Foundation of China (NSFC) [11874276, 11574228]
- Research Grants Council of Hong Kong (CRF Grant) [C6013-18G]
- San Jin Scholars Program of Shanxi Province
- Key Research and Development Program of Shanxi Province [201903D121131]
Ask authors/readers for more resources
Enhancing the circular dichroism signals of chiral plasmonic nanostructures is vital for realizing miniaturized functional chiroptical devices, such as ultrathin wave plates and high-performance chiral biosensors. Rationally assembling individual plasmonic metamolecules into coupled nanoclusters or periodic arrays provides an extra degree of freedom to effectively manipulate and leverage the intrinsic circular dichroism of the constituent structures. Here, we show that sophisticated manipulation over the geometric parameters of a plasmonic stereo-metamolecule array enables selective excitation of its surface lattice resonance mode either by left- or right-handed circularly polarized incidence through diffraction coupling, which can significantly amplify the differential absorption and hence the intrinsic circular dichroism. In particular, since the diffraction coupling requires no index-matching condition and its handedness can be switched by manipulating the refractive index of either the superstrate or the substrate, it is therefore possible to achieve dynamic tuning and active control of the intrinsic circular dichroism response without the need of modifying structure parameters. Our proposed system provides a versatile platform for ultrasensitive chiral plasmonics biosensing and light field manipulation.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available