1. Efficient microparticle trapping with plasmonic annular apertures arrays
- Author
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Viet Giang Truong, Síle Nic Chormaic, and Xue Han
- Subjects
Materials science ,business.industry ,Biomedical Engineering ,Resonance ,Physics::Optics ,Bioengineering ,02 engineering and technology ,General Chemistry ,Trapping ,021001 nanoscience & nanotechnology ,01 natural sciences ,Atomic and Molecular Physics, and Optics ,010309 optics ,Dipole ,Optics ,0103 physical sciences ,Tweezers ,Particle ,General Materials Science ,Electrical and Electronic Engineering ,Surface plasmon resonance ,0210 nano-technology ,Absorption (electromagnetic radiation) ,business ,Plasmon - Abstract
In this work, we demonstrate trapping of microparticles using plasmonic tweezers based on arrays of annular apertures. The transmission spectra and the electric-field distribution are simulated to calibrate the arrays. Theoretically, we observe sharp peaks in the transmission spectra for dipole resonance modes and these are red-shifted as the size of the annular aperture is reduced. We also expect an absorption peak at approximately 1115 m for the localised plasmon resonance. Using a laser frequency between the two resonances, multiple plasmonic hot spots are created and used to trap and transport micron and submicron particles. Experimentally, we demonstrate trapping of individual 0.5 μm and 1 μm polystyrene particles and the feasibility of particle transportation over the surface of the annular apertures using less than 1.5 mW μm−2 incident laser intensity at 980 nm.
- Published
- 2018
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