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Multifunctional Plasmonic Grating Based on the Phase Modulation of Excitation Light
Sen Wang1, Jing Zhang1, Maixia Fu2
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.
Nanomaterials (Basel, Switzerland)
|November 27, 2021
Summary
Researchers developed a versatile plasmonic grating that generates surface plasmon polaritons (SPPs) with three distinct functions. This innovation offers dynamic control over SPP fields, reducing fabrication costs for multifunctional optical devices.
Area of Science:
- Photonics and Optics
- Materials Science
- Nanotechnology
Background:
- Multifunctional optical devices are crucial for advanced applications, demanding high efficiency and flexibility.
- Surface Plasmon Polaritons (SPPs) offer unique light-matter interaction properties at the nanoscale.
- Controlling SPP generation and manipulation is key to developing novel optical functionalities.
Purpose of the Study:
- To propose and numerically demonstrate a plasmonic grating capable of generating multiple SPP field functionalities.
- To investigate the dynamic manipulation of SPP field characteristics, including propagation direction, beam size, and focal position.
- To present a cost-effective approach for creating diverse SPP fields without additional fabrication steps.
Main Methods:
- Numerical simulation of a plasmonic grating designed to modulate excitation light phase.
- Exploiting the phase transfer principle from excitation light to generated SPPs.
- Utilizing different phase profiles (linear gradient, symmetrical, spherical) to excite distinct SPP fields.
Main Results:
- Successfully demonstrated the excitation of Cherenkov SPP wakes, nondiffracting SPP Bessel beams, and focusing SPP fields.
- Showcased dynamic control over SPP wake propagation direction, SPP Bessel beam size and direction, and SPP focus position.
- Validated the versatility of the plasmonic grating for generating multiple SPP field types from a single device.
Conclusions:
- The proposed plasmonic grating offers a multifunctional platform for generating diverse SPP fields.
- Dynamic control over SPP field properties is achievable through phase modulation of excitation light.
- This approach significantly reduces fabrication costs, making it practical for real-world applications in integrated photonics.
