Issue 116, 2016

Role of multipolar plasmon resonances during surface-enhanced Raman spectroscopy on Au micro-patches

Abstract

The enhancement of a Raman signal by multipolar plasmon resonances – as opposed to the more common practice of using dipolar resonances – is investigated. A wide range of gold stars, triangles, circles and squares with multipolar resonances in the visible region were designed and then produced by electron beam lithography. We used 633 nm excitation and Rhodamine 6G as a probe molecule to confirm that, although the dipolar resonances of these shapes lie well into the infrared, SERS in the visible can still be obtained by coupling to their ‘dark mode’ multipolar resonances. However, the magnitude of enhancement in any given shape varied significantly and stochastically. Electromagnetic simulations were used to probe this surprising phenomenon further. These revealed that the presence or absence of a multipolar plasmon resonance at an particular excitation wavelength depended critically on the size and symmetry of the shape being examined, with a good SERS response only possible if the peak of the multipolar resonance is aligned with the 633 nm laser excitation.

Graphical abstract: Role of multipolar plasmon resonances during surface-enhanced Raman spectroscopy on Au micro-patches

Supplementary files

Article information

Article type
Paper
Submitted
08 Sep 2016
Accepted
02 Dec 2016
First published
07 Dec 2016

RSC Adv., 2016,6, 115284-115289

Role of multipolar plasmon resonances during surface-enhanced Raman spectroscopy on Au micro-patches

A. Dowd, M. Geisler, S. Zhu, Michelle L. Wood and M. B. Cortie, RSC Adv., 2016, 6, 115284 DOI: 10.1039/C6RA22450D

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