Bidirectional Optical Sorting of Gold Nanoparticles

Plöschner, Martin; Čižmár, Tomáš; Mazilu, Michaël; Falco, Andrea Di; Dholakia, Kishan

doi:10.1021/nl204378r

Cited by 126 publications

(107 citation statements)

References 41 publications

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“…120 Since the optical forces on metallic particles vary dramatically with particle shape, size and composition, in particular near resonance, interesting opportunities for size/shapeselective optical sorting emerges. [122][123][124] Ploschner et al 122 used size dependent differences in radiation pressure to separate out larger from smaller gold particles in a colloid solution. The method was based on using a total internal reflection objective to launch two overlapping but counter-propagating evanescent waves at different wavelengths (532 nm and 671 nm) close to the plasmon resonances of the particles.…”

Section: Surface Immobilization and Sorting Of Plasmonic Nanoparticlementioning

confidence: 99%

Laser Trapping of Colloidal Metal Nanoparticles

et al. 2015

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Optical trapping using focused laser beams (laser tweezers) has been proven to be extremely useful for contactless manipulation of a variety of small objects, including biological cells, organelles within cells, and a wide range of other dielectric micro- and nano-objects. Colloidal metal nanoparticles have drawn increasing attention in the field of optical trapping because of their unique interactions with electromagnetic radiation, caused by surface plasmon resonance effects, enabling a large number of nano-optical applications of high current interest. Here we try to give a comprehensive overview of the field of laser trapping and manipulation of metal nanoparticles based on results reported in the recent literature. We also discuss and describe the fundamentals of optical forces in the context of plasmonic nanoparticles, including effects of polarization, optical angular momentum, and laser heating effects, as well as the various techniques that have been used to trap and manipulate metal nanoparticles. We conclude by suggesting possible directions for future research.

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Section: Surface Immobilization and Sorting Of Plasmonic Nanoparticlementioning

confidence: 99%

Laser Trapping of Colloidal Metal Nanoparticles

et al. 2015

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“…As the NOSF pulls backward while the POSF pushes forward, particles with different sizes are expected to be sorted, and those within a specified size range can be selected. The mechanism is quite different from the particle sorting that requires two counterpropagating beams with different incident wavelengths, 81 offering an additional degree of freedom to optical manipulation of plasmonic particles.…”

Section: Articlementioning

confidence: 99%

Fano Resonance-Induced Negative Optical Scattering Force on Plasmonic Nanoparticles

et al. 2015

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We demonstrate theoretically that Fano resonance can induce a negative optical scattering force acting on plasmonic nanoparticles in the visible light spectrum when an appropriate manipulating laser beam is adopted. Under the illumination of a zeroth-order Bessel beam, the plasmonic nanoparticle at its Fano resonance exhibits a much stronger forward scattering than backward scattering and consequently leads to a net longitudinal backward optical scattering force, termed Fano resonance-induced negative optical scattering force. The extinction spectra obtained based on the Mie theory show that the Fano resonance arises from the interference of simultaneously excited multipoles, which can be either a broad electric dipole mode and a narrow electric quadrupole mode, or a quadrupole and an octupole mode mediated by the broad electric dipole. Such Fano resonance-induced negative optical scattering force is demonstrated to occur for core-shell, homogeneous, and hollow metallic particles and can therefore be expected to be universal for many other nanostructures exhibiting Fano resonance, adding considerably to the flexibility of optical micromanipulation on the plasmonic nanoparticles. More interestingly, the flexible tunability of the Fano resonance by particle morphology opens up the possibility of tailoring the optical scattering force accordingly, offering an additional degree of freedom to optical selection and sorting of plasmonic nanoparticles.

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“…Once there is bacteria universal gene, the oligonucleotides conjugated with gold nanoparticles will hybridize with its target sequence that brings the gold nanoparticles together. Thus, the color of the liquid will change after hydrochloric acid addition due to the light absorption properties of nanoparticles, which is usually referred as the redshift effect (Aslan et al, 2004;Bakthavathsalam and Rajendran, 2012;Ploschner et al, 2012;Suebsing et al, 2013). For this purpose, thiol chemically modified 16S oligonucleotides conjugated with gold nanoparticles was prepared according to a protocol reported in a previous study (Hill and Mirkin, 2006) before the onchip assay.…”

Section: Preparation Of Gold Nanoparticle-conjugated 16s Probesmentioning

confidence: 99%