3 years ago

Plasmonic Polarization-Rotating Emitters with Metallic Nanogroove Antennas

Plasmonic Polarization-Rotating Emitters with Metallic Nanogroove Antennas
Hongyun Li, Chengwei Sun, Qihuang Gong, Jianjun Chen
A subwavelength plasmonic polarization-rotating emitter is numerically and experimentally demonstrated by designing a metallic nanogroove antenna on the metal surface. The numerical simulation shows that there is a strong resonance in the nanogroove antenna when a surface plasmon polariton mode impinges it, and the polarization of the free-radiation field emitted by the nanogroove antenna is mainly perpendicular to the long side of the nanogroove antenna. As a result, the polarization of the free-radiation field can be easily rotated by tilting the nanogroove antenna. Experimentally, the metallic nanogroove antennas are fabricated, and the polarization-rotating emitters are demonstrated. By tilting the nanogroove antenna with an angle of θ (<60°), the polarization of the free-radiation field can be rotated by θ, and the linear polarization is nearly preserved in a broad bandwidth of Δλ = 180 nm. Because of the polarization rotation of the plasmonic emitter, it is demonstrated that the signal–noise ratio of the far-field collection can be greatly improved. This subwavelength (0.07λ2) and broadband (Δλ = 180 nm) plasmonic polarization-rotating emitter based on the nanogroove antenna provides a new degree of freedom to tailor the light emission from the confined waveguide modes on chips, and it may find important applications in the interchip optical communications. By designing a metallic nanogroove antenna on a gold film, the polarization of the free-radiation field from guided modes can be easily rotated by tilting the nanogroove antenna. As a result, subwavelength (0.07λ2) and broadband (Δλ = 180 nm) polarization-rotating emitters are experimentally demonstrated. These subwavelength and broadband plasmonic polarization-rotating emitters have important applications in the inter-chip optical communications.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1002/adom.201700510

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