Surface plasmons (Surface Plasmon Polaritons, SPPs) are a kind of coherent resonance formed by the interaction of external electromagnetic fields and free electrons on the metal surface, and have a huge local field enhancement effect. It can overcome the diffraction limit and produce many novel optical phenomena, such as negative refraction, perfect prism, and invisibility. These complex phenomena may herald new principles, new theories, and new technologies. SPPs provide the possibility of developing new photonic devices, broadband communication systems, tiny photonic loops, data storage, microscopes, solar cells, and new photonic sensors. At present, sub-wavelength optics based on SPPs has become one of the fastest growing research directions in optics and photonics.
Researchers from the State Key Laboratory of Transient Optics and Photonics Technology, Xi'an Institute of Optics and Precision Mechanics, Chinese Academy of Sciences found in SPPs that metal-dielectric-metal nanocavities have extremely strong optical local resonance and good filtering characteristics. Researchers designed a multi-channel wavelength division multiplexer based on SPPs nano-resonant cavity based on this effect. The test results of the relationship between the physical parameters such as the radius of the nanocavity, the coupling length, the refractive index and the SPPs resonance transmittance show that the wavelength division multiplexer has the advantages of compact structure, adjustable wavelength, high transmittance, etc. Its transmittance ratio The highest value reported in the world has increased by nearly 2 times. This wavelength division multiplexer can be used in integrated optical communications, optical computing, optical information processing and other fields.
Relevant achievements have attracted the attention of the American Optical Society (OSA). The research paper was published in Optics Express. The title of the paper is: Tunable multi-channel wavelength demultiplexer based on MIM plasmonic nanodisk resonators at telecommunication regime, and was selected by OSA as "Image of the week" .
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