High Stability and Low Power Nanometric Bio-Objects Trapping through Dielectric-Plasmonic Hybrid Nanobowtie

Area of Science:

• Biophysics
• Nanotechnology
• Biomedical Engineering

Background:

• Micro and nano-scale manipulation of living matter is vital for biomedical applications like diagnostics and drug assessment.
• Trapping biological nanoparticles remains a significant challenge in current nanotechnology.
• Existing nanotweezers, such as dielectric and plasmonic configurations, offer efficiency and stability but face limitations like cost and manufacturing complexity.

Purpose of the Study:

• To propose and investigate a novel inverted hybrid dielectric-plasmonic nanobowtie.
• To overcome the limitations of existing dielectric-plasmonic systems, including high costs and manufacturing complexity.
• To achieve stable and long-term trapping of biological objects with reduced thermal effects.

Main Methods:

• Numerical simulations were employed to design and analyze the nanobowtie configuration.
• The study focused on an inverted hybrid dielectric-plasmonic nanobowtie design.
• Performance was evaluated based on energy confinement, trapping stability, stiffness, and optical forces.

Main Results:

• The proposed nanobowtie configuration significantly enhances energy field confinement (EC) by over 90% compared to dielectric nanobowties.
• Successful trapping of 100 nm viruses was demonstrated through numerical simulations.
• Achieved trapping stability greater than 10, stiffness of 2.203 fN/nm, and optical forces of approximately 2.96 fN at 10 mW/μm² input power density.

Conclusions:

• The inverted hybrid dielectric-plasmonic nanobowtie offers a cost-effective and manufacturable solution for nanoparticle trapping.
• This novel configuration provides stable, long-term trapping with minimal thermal effects, preserving biological sample integrity.
• The study highlights the potential of this design for advanced biomedical applications requiring precise manipulation of biological matter.