Anapole-assisted near-field optical trapping

Hong, Ikjun; Hong, Chuchuan; Zhu, Guodong; Anyika, Theodore; Ndukaife, Justus C.

doi:10.1117/12.2632549

Cited by 3 publications

(2 citation statements)

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“…All-dielectric nanostructures, on the other hand, have been rapidly developing for the past decade mainly because they are relieved of parasitic Ohmic losses inherent by plasmonic nanostructures 19 . Many works have leveraged its low light absorption and thereby negligible Joule heating to avoid undesired fluid motion and/or positive (repulsive) thermophoresis which can deteriorate the optical trapping stability in plasmonic nanotweezers 20 , such as by leveraging silicon dimers 21 and anapole-assisted nanoantennas [22][23][24] . Very recently, however, an emerging new field of all-dielectric thermonanophotonics focuses on controlling subwavelength optical heating by precisely tuning optical losses in dielectrics 25 .…”

Section: Introductionmentioning

confidence: 99%

Optofluidic transport and particle trapping using an all-dielectric quasi-BIC metasurface

Ndukaife

Yang

2023

Preprint

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Manipulating fluids by light at the nanoscale has been a long-sought-after goal for lab-on-a-chip applications. Plasmonic heating has been demonstrated to control microfluidic dynamics due to the enhanced and confined light absorption from the intrinsic losses of metals. Dielectrics, the counterpart of metals, has been used to avoid undesired thermal effects due to its negligible light absorption. Here, we report an innovative optofluidic system that leverages a quasi-BIC-driven all-dielectric metasurface to achieve nanoscale control of temperature and fluid motion. Our experiments show that suspended particles down to 200 nanometers can be rapidly aggregated to the center of the illuminated metasurface with a velocity of tens of micrometers per second, and up to millimeter-scale particle transport is demonstrated. The strong electromagnetic field enhancement of the quasi-BIC resonance increases the flow velocity up to three times compared with the off-resonant situation. We also experimentally investigate the dynamics of particle aggregation with respect to laser wavelength and power. A physical model is presented and simulated to elucidate the phenomena and surfactants are added to the nanoparticle colloid to validate the model. Our study demonstrates the application of the recently emerged all-dielectric thermonanophotonics in dealing with functional liquids and opens new frontiers in harnessing non-plasmonic nanophotonics to manipulate microfluidic dynamics. Moreover, the synergistic effects of optofluidics and high-Q all-dielectric nanostructures hold enormous potential in high-sensitivity biosensing applications.

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Section: Introductionmentioning

confidence: 99%

Optofluidic transport and particle trapping using an all-dielectric quasi-BIC metasurface

Ndukaife

Yang

2023

Preprint

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“…We confirmed both positive and negative voltages worked, proving that this was dielectrophoresis and not electrophoresis. At the time of review, we became aware of a preprint using an applied field to manipulate and trap extracellular vesicles with a double-nanohole . In that work, the double nanohole was surrounded with many holes and these additional holes pushed the particle toward the center where the double nanohole was located.…”

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confidence: 99%

Fringe Dielectrophoresis Nanoaperture Optical Trapping with Order of Magnitude Speed-Up for Unmodified Proteins

2023

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Single molecule analysis of proteins in an aqueous environment without modification (e.g., labels or tethers) elucidates their biophysics and interactions relevant to drug discovery. By combining fringe-field dielectrophoresis with nanoaperture optical tweezers we demonstrate an order of magnitude faster time-to-trap for proteins when the counter electrode is outside of the solution. When the counter electrode is inside the solution (the more common configuration found in the literature), electrophoresis speeds up the trapping of polystyrene nanospheres, but this was not effective for proteins in general. Since time-to-trap is critical for high-thoughput analysis, these findings are a major advancement to the nanoaperture optical trapping technique for protein analysis.

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Optofluidic transport and assembly of nanoparticles using an all-dielectric quasi-BIC metasurface

Yang

Ndukaife

2023

Light Sci Appl

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Manipulating fluids by light at the micro/nanoscale has been a long-sought-after goal for lab-on-a-chip applications. Plasmonic heating has been demonstrated to control microfluidic dynamics due to the enhanced and confined light absorption from the intrinsic losses of metals. Dielectrics, the counterpart of metals, has been used to avoid undesired thermal effects due to its negligible light absorption. Here, we report an innovative optofluidic system that leverages a quasi-BIC-driven all-dielectric metasurface to achieve subwavelength scale control of temperature and fluid motion. Our experiments show that suspended particles down to 200 nanometers can be rapidly aggregated to the center of the illuminated metasurface with a velocity of tens of micrometers per second, and up to millimeter-scale particle transport is demonstrated. The strong electromagnetic field enhancement of the quasi-BIC resonance increases the flow velocity up to three times compared with the off-resonant situation by tuning the wavelength within several nanometers range. We also experimentally investigate the dynamics of particle aggregation with respect to laser wavelength and power. A physical model is presented and simulated to elucidate the phenomena and surfactants are added to the nanoparticle colloid to validate the model. Our study demonstrates the application of the recently emerged all-dielectric thermonanophotonics in dealing with functional liquids and opens new frontiers in harnessing non-plasmonic nanophotonics to manipulate microfluidic dynamics. Moreover, the synergistic effects of optofluidics and high-Q all-dielectric nanostructures hold enormous potential in high-sensitivity biosensing applications.

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Anapole-assisted near-field optical trapping

Cited by 3 publications

References 0 publications

Optofluidic transport and particle trapping using an all-dielectric quasi-BIC metasurface

Optofluidic transport and particle trapping using an all-dielectric quasi-BIC metasurface

Fringe Dielectrophoresis Nanoaperture Optical Trapping with Order of Magnitude Speed-Up for Unmodified Proteins

Optofluidic transport and assembly of nanoparticles using an all-dielectric quasi-BIC metasurface

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