Plasmonic rainbow rings induced by white radial polarization

Tzu Hsiang Lan, Yi Kuan Chung, Jie En Li, Chung-Hao Tien*

*Corresponding author for this work

Research output: Contribution to journalArticle

3 Scopus citations


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 NA = 1.45) a polychromatic radially polarized beam on an Au (20 nm)/SiO2 (500 nm)/Au (20 nm) sandwich structure. Without the need for angular or spectral scanning, the virtual spectral probe snapshots a wide operation range (n = 1-1.42; λ = 400-700 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.

Original languageEnglish
Pages (from-to)1205-1207
Number of pages3
JournalOptics Letters
Issue number7
StatePublished - 1 Apr 2012

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