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Opto-mechanical force mapping of deep subwavelength plasmonic modes
John Kohoutek1, Dibyendu Dey, Alireza Bonakdar
1Bio-Inspired Sensors and Optoelectronics Laboratory (BISOL), EECS, Northwestern University 2145 Sheridan Road, Evanston, Illinois 60208, United States.
Nano Letters
|July 21, 2011
Summary
We mapped optical forces near a bowtie nanoantenna using Maxwell
Area of Science:
- Nanophotonics
- Plasmonics
Background:
- Optical forces are key to plasmonic applications.
- Understanding force distribution is essential for device design.
Purpose of the Study:
- To spatially map optical forces in a bowtie nanoantenna.
- To validate simulation methods against experimental data.
Main Methods:
- Simulated optical force using Maxwell's stress tensor method.
- Utilized a metal-dielectric-metal bowtie nanoantenna.
- Operated at a wavelength of 1550 nm.
Main Results:
- Successfully mapped optical force distribution.
- Simulation results showed good agreement with experimental data.
- Demonstrated high spatial resolution mapping.
Conclusions:
- Maxwell's stress tensor method accurately predicts optical forces.
- This method enables simultaneous mapping of field intensity and optical force.
- Crucial for advancing plasmonic optical trapping for biosensing and optomechanical switching.
