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Corrugated Gold Tip as Optical Tweezers to Apply Force on Zinc Sulphide Quantum Dot Nanoparticle

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Abstract

One of the most important issues after synthesizing colloidal quantum dot nanoparticles is how to use them. In some cases, a very small number of these nanoparticles is needed. One of the ways to remove small amounts of these nanoparticles is to use a tip-shaped plasmonic optical tweezer made of metal. This work is dedicated to the improvement of the near-field enhancement beneath the tip apex due to delocalized plasmon excitation on a sub-wavelength grating engraved on the tip and nanofocusing of these plasmons. All the simulations of electromagnetic wave scattering on the nanoantenna are based on the finite difference time domain method. We have compared the force exerted on a 2 nm quantum dot nanoparticle of zinc sulphide with two plasmonic optical tweezers: a bare tip and a corrugated tip. In order to better use the concept of a plasmonic optical tweezer, the geometry of this system should be optimized. The geometrical parameters involved in the intensity distribution and consequently the force are the grating period, duty cycle, and the distance from the last grating to the top of the cone. By applying circular grating to the conical plasmonic tweezer made of gold, more force has been applied to the nanoparticle.

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Data Availability

No datasets were generated or analyzed during the current study.

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Acknowledgements

The authors acknowledge the academic support and cooperation of Shahed University and Kazan Federal University.

Author information

Authors and Affiliations

  1. Shahed University, Tehran, Iran

    Ali Azam Khosravi

  2. Kazan Federal University, Kazan, Russia

    Mehdi Zohrabi, Almaz Gazizov & Myakzum Salakhov

  3. Tehran Science and Research Branch, Islamic Azad University, Tehran, Iran

    Mahdi Mowlavi

  4. Malayer University, Malayer, Iran

    Mohhamad Reza Mohebbi Far

Authors
  1. Ali Azam Khosravi
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  2. Mehdi Zohrabi
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  3. Mahdi Mowlavi
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  4. Mohhamad Reza Mohebbi Far
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  5. Almaz Gazizov
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  6. Myakzum Salakhov
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Contributions

A.A.K. has been longly doing research on ZnS quantum dots and synthesis of ZnS quantum dots with sizes below 5 nm which are his specific research work as a teacher and researcher at Shahed University. M.Z. is a Ph.D. research student at Kazan Federal University, and his contribution to this work is mainly concentrated on gold tip corrugated optical antennas, as a part of his PhD research plan. M.M. has been associated in this work as a coworker with M.Z. in making the tip antennas and simulation processes also. M.M.F. as a reputed professor has contributed effectively as a consultant in this work especially in analyzing data. A.G. and M.S. are both the research guides of M.Z.’s PhD work.

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Correspondence to Ali Azam Khosravi.

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Khosravi, A.A., Zohrabi, M., Mowlavi, M. et al. Corrugated Gold Tip as Optical Tweezers to Apply Force on Zinc Sulphide Quantum Dot Nanoparticle. Plasmonics (2024). https://doi.org/10.1007/s11468-024-02272-x

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