Compact hybrid plasmonic slot waveguide sensor with a giant enhancement factor for surface-enhanced Raman scattering application
| Autor: | Sijie Luo, Shuqing Chen, Erkuang Zhu, Yanying Zhu, Suoming Wang |
|---|---|
| Rok vydání: | 2021 |
| Předmět: |
Materials science
business.industry Physics::Optics Dielectric Surface plasmon polariton Atomic and Molecular Physics and Optics law.invention Slot-waveguide symbols.namesake chemistry.chemical_compound Optics Silicon nitride chemistry law symbols Surface plasmon resonance business Waveguide Plasmon Raman scattering |
| Zdroj: | Optics express. 29(16) |
| ISSN: | 1094-4087 |
| Popis: | In this paper, a surface-enhanced Raman scattering (SERS) sensor with a giant field enhancement factor based on the coupling of surface plasmon polaritons (SPPs) is designed and studied theoretically. The proposed sensor adopts a metal-dielectric layered hybrid slot waveguide structure, combining thin metal (gold) layers and silicon nitride strip waveguides. Unlike other similar sensors, the silicon nitride waveguide structure does not serve as an excitation signal channel, conventionally loaded with the guided modes, but as an auxiliary layer, making it easier to concentrate the light field in the slot. Therefore, the sensor has a higher enhancement factor compared to the pure metal or dielectric slot structure. The results exhibit that we can obtain a maximum enhancement factor exceeding 10^6 under the compact configuration of 510 × 300 × 225nm^3 at the wavelength of 785 nm. By analyzing the dependence of the sensor performance on the structural parameters, we show that the structure of such sensor can directly be applied to SERS spectroscopic analysis as well as integrated with micro-and nano-photonic platform to perform on-chip detection system. |
| Databáze: | OpenAIRE |
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