Efficient Optical Trapping of Nano-Particle via Waveguide-Coupled Hybrid Plasmonic Nano-Taper

For manipulating nano-bio-specimens, we propose a tweezing device by integrating a triangular-shaped photonic-plasmonic nano-taper on top of a coupling waveguide. The device can exert strong trapping force on nano-particle owing to efficient optical energy usage and accessible field distribution. Wo...

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Bibliographic Details
Published in:IEEE photonics journal 2019-06, Vol.11 (3), p.1-12
Main Authors: Lin, Yi-Chang, Lee, Po-Tsung
Format: Article
Language:English
Subjects:
Biomedical optical imaging
Coupling
Energy consumption
Force
hybrid plasmonic mode
Misalignment
nano-particles
Optical coupling
Optical device fabrication
Optical properties
Optical surface waves
Optical trapping
Optical tweezers
Optical waveguides
Photonics
Plasmons
Polystyrene resins
waveguide coupling
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Summary:For manipulating nano-bio-specimens, we propose a tweezing device by integrating a triangular-shaped photonic-plasmonic nano-taper on top of a coupling waveguide. The device can exert strong trapping force on nano-particle owing to efficient optical energy usage and accessible field distribution. Working principle and optical characteristics of the device are fully investigated and discussed. The optimized device shows an excellent trapping capability with low threshold power of 3.57 mW for stable trapping n 100 nm polystyrene particle. Simple geometry and high tolerance to pattern misalignment between trap unit and coupling waveguide are beneficial for realistic fabrication. Furthermore, the footprint of trap unit is only 400 nm × 625 nm. We believe this design will be very useful to the development of lab-on-a-chip system.
ISSN:1943-0655
1943-0655
1943-0647
DOI:10.1109/JPHOT.2019.2912836