Extreme field confinement in zigzag plasmonic crystals
| Autor: | Moohyuk Kim, Young Ho Jin, Han Na Kim, Myung Ki Kim, Nu Ri Park, Keun Soo Lee |
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| Rok vydání: | 2020 |
| Předmět: |
Waveguide (electromagnetism)
Materials science Field (physics) Band gap Physics::Optics Bioengineering 02 engineering and technology 010402 general chemistry 01 natural sciences Crystal Broadband Physics::Atomic and Molecular Clusters General Materials Science Electrical and Electronic Engineering Plasmon Coupling business.industry Mechanical Engineering General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Zigzag Mechanics of Materials Optoelectronics Condensed Matter::Strongly Correlated Electrons 0210 nano-technology business |
| Zdroj: | Nanotechnology. 31(49) |
| ISSN: | 1361-6528 |
| Popis: | We propose extreme field confinement in a zigzag plasmonic crystal that can produce a wide plasmonic bandgap near the visible frequency range. By applying a periodic zigzag structure to a metal-insulator-metal plasmonic waveguide, the lowest three plasmonic crystal bands are flattened, creating a high-quality broadband plasmonic mirror over a wavelength range of 526-909 nm. Utilizing zigzag plasmonic crystals in a three-dimensional tapered metal-insulator-metal plasmonic cavity, extreme field confinement with a modal volume of less than 0.00005 λ 3 can be achieved even at resonances over a wide frequency range. In addition, by selecting the number of zigzag periods in the plasmonic crystal, critical coupling between the cavity and the waveguide can be achieved, thereby maximizing the field intensity with an enhancement factor of 105 or more. We believe that zigzag plasmonic crystals will provide a powerful platform for implementing broadband on-chip plasmonic devices. |
| Databáze: | OpenAIRE |
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