Determination of size and refractive index of single gold nanoparticles using an optofluidic chip | Zendy

Yuzhi Shi | Zendy; Sha Xiong | Zendy; L. K. Chin | Zendy; J. B. Zhang | Zendy; W. Ser | Zendy; Jing Wu | Zendy; Tianning Chen | Zendy; Zhenchuan Yang | Zendy; Yilong Hao | Zendy; A. Q. Liu | Zendy

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Determination of size and refractive index of single gold nanoparticles using an optofluidic chip

Author(s) -

Yuzhi Shi,

Sha Xiong,

L. K. Chin,

J. B. Zhang,

W. Ser,

Jing Wu,

Tianning Chen,

Zhenchuan Yang,

Yilong Hao,

A. Q. Liu

Publication year - 2017

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.5004727

Subject(s) - refractive index , colloidal gold , nanoparticle , materials science , trapping , optical tweezers , optics , optofluidics , bessel beam , analytical chemistry (journal) , bessel function , nanotechnology , optoelectronics , microfluidics , chemistry , physics , chromatography , ecology , biology

We report a real-time method to determine the size, i.e. diameter, and refractive index of single gold nanoparticles using an optofluidic chip, which consists of a quasi-Bessel beam optical chromatography. The tightly focused (∼ 0.5 μm) quasi-Bessel beam with low divergence (NA ∼ 0.04) was used to trap sub-100 nm gold nanoparticles within a long trapping distance of 140 μm. In the experiment, 60 to 100 nm gold nanoparticles were separated efficiently with at least 18 μm. The diameter and refractive index (real and imaginary) of single gold nanoparticles were measured at high resolutions with respect to the trapping distance, i.e. 0.36 nm/μm, 0.003/μm and 0.0016/μm, respectively

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