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

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