Superimposed Arrays of Nanoprisms for Multispectral Molecular Plasmonics

• DOI: 10.1021/acsphotonics.6b00388
• Publication Date: 2016-07-29T13:27:21Z
• Authors: Gregory Q. Wallace; Mohammadali Tabat...; Renjie Hou; Matthew J. Coady; Peter R. Norton; Todd S. Simpson; Scott M. Rosendahl; Alexandre Merlen; François Lagugné-...
• Keywords: Surface-Enhanced Raman Spectroscopy; Nanosphere lithography; Prism

Molecular plasmonics relies on the development of conductive nanostructures to yield large local electromagnetic enhancement enabling detection molecules located in their vicinity. Although various spectroscopic techniques benefit from such enhancement, performing different measurements same platform remains a challenge. As such, rational design structures capable effects over spectral range, particularly visible mid-infrared, is great interest. Herein, we have developed series metallic patterns, consisting superimposed arrays gold nanoprisms, that potential for surface-enhanced Raman spectroscopy (SERS), fluorescence (SEF), and infrared absorption (SEIRA). We first demonstrate modified version nanosphere lithography method can be used fabricate platforms. Patterns with selected sizes further produced by electron-beam virtually no defects, thus yielding tunable precise optical resonances mid-infrared range. The hexagonal lattices were composed smaller prisms (0.25 μm prism base length) incorporated SERS SEF applications larger triangles (1–2 size) SEIRA purposes. patterns display regions are compatible SEF, SERS, SEIRA, opening promising multispectral molecules.