Abstract

This Letter presents a scheme to embed both angular/spectral surface plasmon resonance (SPR) in a unique far-field rainbow feature by tightly focusing (effective $\mathrm{NA}=1.45$) a polychromatic radially polarized beam on an $\mathrm{Au}\hspace{0.17em}(20\mathrm{nm})/{\mathrm{SiO}}_2\hspace{0.17em}(500\mathrm{nm})/\mathrm{Au}\hspace{0.17em}(20\mathrm{nm})$ sandwich structure. Without the need for angular or spectral scanning, the virtual spectral probe snapshots a wide operation range ($n=1–1.42$; $\mathrm{\lambda }=400–700\mathrm{nm}$) of SPR excitation in a locally nanosized region. Combined with the high-speed spectral analysis, a proof-of-concept scenario was given by monitoring the NaCl liquid concentration change in real time. The proposed scheme will certainly has a promising impact on the development of objective-based SPR sensor and biometric studies due to its rapidity and versatility.

©2012 Optical Society of America

Fabry–Pérot-based surface plasmon resonance sensors

Feng Xiao, Guangyuan Li, Kamal Alameh, and Anshi Xu
Opt. Lett. 37(22) 4582-4584 (2012)

Surface plasmon rainbow jets

A. Bouhelier and G. P. Wiederrecht
Opt. Lett. 30(8) 884-886 (2005)

Radial polarization induced surface plasmon virtual probe for two-photon fluorescence microscopy

K. J. Moh, X.-C. Yuan, J. Bu, S. W. Zhu, and Bruce Z. Gao
Opt. Lett. 34(7) 971-973 (2009)

Surface plasmon polariton compression through radially and linearly polarized source

Remo Proietti Zaccaria, Francesco De Angelis, Andrea Toma, Luca Razzari, Alessandro Alabastri, Gobind Das, Carlo Liberale, and Enzo Di Fabrizio
Opt. Lett. 37(4) 545-547 (2012)

Plasmonic wavelength splitter based on a large-area dielectric grating and white light illumination

Jae-Chul Song, Woo Kyung Jung, Nak-Hyeon Kim, and Kyung Min Byun
Opt. Lett. 37(18) 3915-3917 (2012)