Journal article

Algorithm-Designed Plasmonic Nanotweezers: Quantitative Comparison by Theory, Cathodoluminescence, and Nanoparticle Trapping

Neuton Li, Jasper Cadusch, Amelia Liu, Anders J Barlow, Ann Roberts, Kenneth B Crozier

ADVANCED OPTICAL MATERIALS | WILEY-V C H VERLAG GMBH | Published : 2021

Abstract

Plasmonic apertures permit optical fields to be concentrated into sub-wavelength regions. This enhances the optical gradient force, enabling the precise trapping of nanomaterials such as quantum dots, proteins, and DNA molecules at modest laser powers. Double nanoholes, coaxial apertures, bowtie apertures, and other structures have been studied as plasmonic nanotweezers, with the design process generally comprising intuition followed by electromagnetic simulations with parameter sweeps. Here, instead, a computational algorithm is used to design plasmonic apertures for nanoparticle trapping. The resultant apertures have highly irregular shapes that, in combination with ring couplers also opti..

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Grants

Awarded by Research Council (ARC)


Awarded by ARC


Awarded by Australian Research Council


Funding Acknowledgements

The authors acknowledge use of facilities within the Monash Centre for Electron Microscopy. This work was performed in part at the Materials Characterization and Fabrication Platform (MCFP) at the University of Melbourne and the Victorian Node of the Australian National Fabrication Facility (ANFF). This research used equipment funded by Australian Research Council (ARC, LE140100104). This work was furthermore supported by the ARC Discovery Projects scheme (DP180104141). A.L. acknowledges support from the Australian Research Council (FT180100594).