Sequential trapping of single nanoparticles using a gold plasmonic nanohole array

Xue Han; Viet Giang Truong; Prince Sunil Thomas; Síle Nic Chormaic

doi:10.1364/PRJ.6.000981

Journals >Photonics Research >Volume 6 >Issue 10 >Page 981 > Article

Photonics Research
Vol. 6, Issue 10, 981 (2018)

Sequential trapping of single nanoparticles using a gold plasmonic nanohole array

Xue Han¹, Viet Giang Truong^1、*, Prince Sunil Thomas^1、3, and Síle Nic Chormaic^1、2

Author Affiliations

¹Light-Matter Interactions Unit, Okinawa Institute of Science and Technology Graduate University, Onna, Okinawa 904-0495, Japan

²Université Grenoble Alpes, CNRS, Grenoble INP, Institut Néel, 38000 Grenoble, France

³Current address: Advanced Optical Imaging Group, School of Physics, University College Dublin, Ireland

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DOI: 10.1364/PRJ.6.000981 Cite this Article Set citation alerts

Xue Han, Viet Giang Truong, Prince Sunil Thomas, Síle Nic Chormaic, "Sequential trapping of single nanoparticles using a gold plasmonic nanohole array," Photonics Res. 6, 981 (2018) Copy Citation Text

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Abstract

We have used a gold nanohole array to trap single polystyrene nanoparticles, with a mean diameter of 30 nm, into separated hot spots located at connecting nanoslot regions. A high trap stiffness of approximately

0.85 fN / (nm \cdot mW)

at a low-incident laser intensity of

～ 0.51 mW / {μm}^{2}

at 980 nm was obtained. The experimental results were compared to the simulated trapping force, and a reasonable match was achieved. This plasmonic array is useful for lab-on-a-chip applications and has particular appeal for trapping multiple nanoparticles with predefined separations or arranged in patterns in order to study interactions between them.

Keywords

Optical confinement and manipulation Optical tweezers or optical manipulation Surface plasmons

F = \oint_{s} (⟨ T_{M} ⟩ \cdot n_{s}) d S,

(1)

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U (r) = \int_{\infty}^{r} F (r^{'}) d r^{'},

(2)

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\frac{d x (t)}{d t} = \frac{k_{mea}}{γ} x (t) + {(\frac{2 k_{B} T}{γ})}^{1 / 2} ς (t),

(3)

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τ = \frac{γ}{k_{mea}} .

(4)

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Xue Han, Viet Giang Truong, Prince Sunil Thomas, Síle Nic Chormaic, "Sequential trapping of single nanoparticles using a gold plasmonic nanohole array," Photonics Res. 6, 981 (2018)

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