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Dynamically Modulating Plasmonic Field by Tuning the Spatial Frequency of Excitation Light
Sen Wang1, Minghua Sun1, Shanqin Wang1
1Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, College of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
Researchers established a link between plasmonic field displacement and excitation light spatial frequency using Fourier transforms of surface plasmon polaritons (SPPs). Tailoring SPP fields via spatial frequency modulation offers applications in particle manipulation and focused light propagation.
Area of Science:
- Optics and Photonics
- Plasmonics
- Nanophotonics
Background:
- Surface plasmon polaritons (SPPs) are electromagnetic waves coupled to electron oscillations on metal surfaces.
- Controlling the behavior of SPPs is crucial for developing advanced optical devices.
- Existing methods for SPP manipulation often lack precise spatial control.
Purpose of the Study:
- To theoretically establish the relationship between plasmonic field displacement and excitation light spatial frequency.
- To demonstrate precise control over the focusing and vortex field positions of SPPs.
- To explore potential applications of dynamically tailored plasmonic fields.
Main Methods:
- Utilized Fourier transform (FT) analysis of surface plasmon polaritons (SPPs).
- Developed theoretical models to describe the transversal and longitudinal field shifts.
- Performed simulations to validate theoretical predictions.
Main Results:
- Established a theoretical link between spatial frequency components (fx, fy) and SPP field displacement.
- Demonstrated that SPP field shifts occur transversally or longitudinally with changes in spatial frequency.
- Showcased precise localization of SPP focus and vortex fields by selecting appropriate spatial frequencies.
- Simulation results confirmed the theoretical analyses.
Conclusions:
- Dynamically tailoring plasmonic fields through spatial frequency modulation is feasible.
- This technique allows for precise control over SPP field localization.
- Potential applications include microparticle manipulation and angular multiplexed SPP focusing and propagation.
