Differential phase-detecting localized surface plasmon resonance sensor with self-assembly gold nano-islands

Guangyu Qiu; Siu Pang Ng; Chi Man Lawrence Wu

doi:10.1364/OL.40.001924

Differential phase-detecting localized surface plasmon resonance sensor with self-assembly gold nano-islands

Guangyu Qiu, Siu Pang Ng, Chi Man Lawrence Wu^*

^*Corresponding author for this work

Research output: Journal Publications and Reviews › RGC 21 - Publication in refereed journal › peer-review

28 Citations (Scopus)

Abstract

Self-assembly (SAM) gold nano-islands are fabricated by two-step thin-film deposition-annealing method. Despite random distribution of the SAM, the p-polarized light after total internal reflection shows significant phase transition at the extinction wavelengths upon refractive index variation due to localized surface plasmon resonance (LSPR) effect. It resembles the sharp phase transition observed in conventional surface plasmon resonance (SPR) biosensors, so that the bulk sensitivity of the SAM-LSPR sensor is improved via the phase interrogation method. In this Letter, we present both computational and experimental investigations to the SAM-LSPR sensor and the results show excellent agreement with each other. With bulk refractive index resolution to 9.75 × 10^-8 RIU, we believe the phase-detecting SAM-LSPR sensor would be an essential step toward low-cost labelfree sensing applications.

Original language	English
Pages (from-to)	1924-1927
Journal	Optics Letters
Volume	40
Issue number	9
Online published	20 Apr 2015
DOIs	https://doi.org/10.1364/OL.40.001924
Publication status	Published - 1 May 2015

Research Keywords

Surface plasmons
Interferometry
Biological sensing and sensors
Nanostructure fabrication

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abstract = "Self-assembly (SAM) gold nano-islands are fabricated by two-step thin-film deposition-annealing method. Despite random distribution of the SAM, the p-polarized light after total internal reflection shows significant phase transition at the extinction wavelengths upon refractive index variation due to localized surface plasmon resonance (LSPR) effect. It resembles the sharp phase transition observed in conventional surface plasmon resonance (SPR) biosensors, so that the bulk sensitivity of the SAM-LSPR sensor is improved via the phase interrogation method. In this Letter, we present both computational and experimental investigations to the SAM-LSPR sensor and the results show excellent agreement with each other. With bulk refractive index resolution to 9.75 × 10-8 RIU, we believe the phase-detecting SAM-LSPR sensor would be an essential step toward low-cost labelfree sensing applications.",

keywords = "Surface plasmons, Interferometry, Biological sensing and sensors, Nanostructure fabrication",

author = "Guangyu Qiu and Ng, {Siu Pang} and Wu, {Chi Man Lawrence}",

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T1 - Differential phase-detecting localized surface plasmon resonance sensor with self-assembly gold nano-islands

AU - Qiu, Guangyu

AU - Ng, Siu Pang

AU - Wu, Chi Man Lawrence

PY - 2015/5/1

Y1 - 2015/5/1

N2 - Self-assembly (SAM) gold nano-islands are fabricated by two-step thin-film deposition-annealing method. Despite random distribution of the SAM, the p-polarized light after total internal reflection shows significant phase transition at the extinction wavelengths upon refractive index variation due to localized surface plasmon resonance (LSPR) effect. It resembles the sharp phase transition observed in conventional surface plasmon resonance (SPR) biosensors, so that the bulk sensitivity of the SAM-LSPR sensor is improved via the phase interrogation method. In this Letter, we present both computational and experimental investigations to the SAM-LSPR sensor and the results show excellent agreement with each other. With bulk refractive index resolution to 9.75 × 10-8 RIU, we believe the phase-detecting SAM-LSPR sensor would be an essential step toward low-cost labelfree sensing applications.

AB - Self-assembly (SAM) gold nano-islands are fabricated by two-step thin-film deposition-annealing method. Despite random distribution of the SAM, the p-polarized light after total internal reflection shows significant phase transition at the extinction wavelengths upon refractive index variation due to localized surface plasmon resonance (LSPR) effect. It resembles the sharp phase transition observed in conventional surface plasmon resonance (SPR) biosensors, so that the bulk sensitivity of the SAM-LSPR sensor is improved via the phase interrogation method. In this Letter, we present both computational and experimental investigations to the SAM-LSPR sensor and the results show excellent agreement with each other. With bulk refractive index resolution to 9.75 × 10-8 RIU, we believe the phase-detecting SAM-LSPR sensor would be an essential step toward low-cost labelfree sensing applications.

KW - Surface plasmons

KW - Interferometry

KW - Biological sensing and sensors

KW - Nanostructure fabrication

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DO - 10.1364/OL.40.001924

M3 - RGC 21 - Publication in refereed journal

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JO - Optics Letters

JF - Optics Letters

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Differential phase-detecting localized surface plasmon resonance sensor with self-assembly gold nano-islands

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