Plasmonic Superchiral Lattice Resonances in the Mid-Infrared

Year: 2020

Authors: Mattioli F., Mazzeo G., Longhi G., Abbate S., Pellegrini G., Mogni E., Celebrano M., Finazzi M., Duo L., Zanchi CG., Tommasini M., Pea M., Cibella S., Polito R., Sciortino F., Baldassarre L., Nucara A., Ortolani M., Biagioni P.

Autors Affiliation: Politecn Milan, Dipartimento Fis, Leonardo da Vinci 32, I-20133 Milan, Italy; CNR, Ist Foton & Nanotecnol, I-00156 Rome, Italy; Univ Brescia, Dipartimento Med Mol & Traslaz, I-25123 Brescia, Italy; CNR, Ist Nazl Ottica, Brescia Res Unit, CSMT, I-25123 Brescia, Italy; Politecn Milan, Dipartimento Chim Mat & Ingn Chim, I-20133 Milan, Italy; Sapienza Univ Roma, Dipartimento Fis, I-000185 Rome, Italy.

Abstract: Recent efforts in the field of surface-enhanced spectroscopies have focused on the paradigm of “superchirality”, entailing the engineering of the local electromagnetic fields to boost the enantiospecific interaction between light and chiral molecules. In this framework, approaches based on both metallic and dielectric nanostructures have been proposed and have also recently been extended to vibrational circular dichroism in the mid-infrared. In this work, we design, fabricate, and characterize a lattice of chiral plasmonic slits featuring enhanced chiral fields in the mid-infrared. We exploit collective lattice resonances to further enhance the local intensity and to generate sharp features in the circular dichroism spectra of the platform. Such features are ideally suited to test the superchiral coupling with the vibrational resonances of chiral molecules.

Journal/Review: ACS PHOTONICS

Volume: 7 (10)      Pages from: 2676  to: 2681

More Information: We acknowledge the kind support of Philippe Lalanne in the use of the RETICOLO software and the contribution of Francesco Rusconi to the discussion of the experimental results. The research leading to these results has received funding from the Italian Ministry of Education, University, and Research (MIUR), PRIN Project “Plasmon-enhanced vibrational circular dichroism”, ID 2015FSHNCB.
KeyWords: plasmonics; mid-infrared; optical chirality; vibrational circular dichroism; lattice resonances
DOI: 10.1021/acsphotonics.0c00161

Citations: 25
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