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Optical forces in silicon subwavelength-grating waveguides
Optics Express
|December 17, 2017
Summary
Silicon subwavelength-grating (SWG) waveguides enable stable, periodic trapping of nanoparticles, offering design flexibility and enhanced lateral working distance compared to conventional waveguides.
Area of Science:
- Photonics and Nanophotonics
- Optical Engineering
Background:
- Conventional optical waveguides have limitations in trapping nanoparticles due to their continuous light field distribution.
- Periodic structures offer unique light field confinement properties.
Purpose of the Study:
- To theoretically analyze the optical forces generated by Bloch mode propagation in silicon subwavelength-grating (SWG) waveguides.
- To investigate the potential of SWG waveguides for periodic nanoparticle trapping.
Main Methods:
- Theoretical analysis of optical forces induced by Bloch modes.
- Modeling of light field distribution in SWG waveguides.
Main Results:
- SWG waveguides exhibit periodic light field distributions, enabling stable, periodic nanoparticle trapping.
- The separation of trapped nanoparticles can be precisely controlled by adjusting the grating period.
- SWG waveguides provide a larger lateral working distance for trapping nanoparticles compared to conventional waveguides.
Conclusions:
- Silicon SWG waveguides present a novel and advantageous platform for periodic nanoparticle manipulation.
- The design flexibility and enhanced trapping capabilities of SWG waveguides open new avenues in nanophotonics and optical trapping applications.
