Broadband chiral hybrid plasmon modes on nanofingernail substrates

Paulina Librizzi; Aneek Biswas; Roger Chang; Xiang-Tian Kong; Matthew Moocarme; Gaurav Ahuja; Ilona Kretzschmar; Luat T Vuong

doi:10.1039/c9nr07394a

Broadband chiral hybrid plasmon modes on nanofingernail substrates

Nanoscale. 2020 Feb 14;12(6):3827-3833. doi: 10.1039/c9nr07394a. Epub 2020 Jan 29.

Authors

Paulina Librizzi¹, Aneek Biswas², Roger Chang¹, Xiang-Tian Kong³, Matthew Moocarme², Gaurav Ahuja³, Ilona Kretzschmar¹, Luat T Vuong⁴

Affiliations

¹ Department of Chemical Engineering, City College of New York of the City University of New York (CUNY), New York, New York 10031, USA. kretzschmar@ccny.cuny.edu.
² Department of Physics, Graduate Center of the City University of New York (CUNY), New York, New York 10016, USA. luatv@ucr.edu and Department of Physics, Queens College of the City University of New York (CUNY), Queens, New York 11367, USA.
³ Department of Mechanical Engineering, Bourns Hall, University of California at Riverside, Riverside, California 92521, USA.
⁴ Department of Physics, Graduate Center of the City University of New York (CUNY), New York, New York 10016, USA. luatv@ucr.edu and Department of Physics, Queens College of the City University of New York (CUNY), Queens, New York 11367, USA and Department of Mechanical Engineering, Bourns Hall, University of California at Riverside, Riverside, California 92521, USA.

PMID: 31995089
DOI: 10.1039/c9nr07394a

Abstract

There is significant interest in the utility of asymmetric nanoaperture arrays as substrates for the surface-enhanced detection, fluorescence, and imaging of individual molecules. This work introduces obliquely-cut, out-of-plane, coaxial layered structures on an aperture edge. We refer to these structures as nanofingernails, which emphasizes their curved, oblique, and out-of-plane features. Broadband coupling into chiral hybrid plasmon modes and helicity-dependent near-field scattering without circular dichroism are demonstrated. The unusually-broadband, multipolar modes of nanofingernail micropore structures exhibit phase retardation effects that may be useful for achieving spatial overlap at different frequencies. The nanofingernail geometry shows new potential for simultaneous polarization-enhanced hyperspectral imaging on apertured, plasmonic surfaces.