Controlling light scattering and emission at subwavelength scale with plasmonic nanopatch antennas (Presentation Recording)

Zilong Wu; Yuebing Zheng

doi:10.1117/12.2187309

5 October 2015 Controlling light scattering and emission at subwavelength scale with plasmonic nanopatch antennas (Presentation Recording)

Zilong Wu, Yuebing Zheng

Author Affiliations +

Proceedings Volume 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII; 95471X (2015) https://doi.org/10.1117/12.2187309
Event: SPIE Nanoscience + Engineering, 2015, San Diego, California, United States

Abstract

Controlling light scattering and emission at subwavelength scale has significant implications for solar energy conversion, sensing, and nanophotonic devices. Plasmonic nanopatch antennas (PNAs), which consist of plasmonic nanoparticle coupled with metallic films, have shown directionality of radiation and large emission rate enhancement due to the strong plasmonic waveguide modes within the spacer layer. Herein, we comparatively study the light scattering and emission behaviors of a series of plasmonic nanopatch antennas (PNAs) with different plasmonic nanoparticles (i.e., nanosquare, nanotriangle, nanorod, and nanodisk) to develop the design rules of the PNAs. Using finite-difference time-domain (FDTD) simulations, we show that the shape and size of plasmonic nanoparticles can be tuned to control the resonance peak, intensity, directionality, and spatial distribution of the scattering light as well as the directionality, spatial distribution, spontaneous emission rate, quantum efficiency, and radiation enhancement factor of light emission. For example, high radiative quantum efficiency (0.74) and radiation enhancement factor (>20) can be achieved by disk PNA, while triangle PNA shows remarkable spontaneous emission rate enhancement of over 2,500. The effects of locations of emitters relative to the PNAs on the emission properties are also examined. Our results pave the way towards the rational design of PNAs for the optimal light scattering and emission as required by targeted applications.

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Zilong Wu and Yuebing Zheng "Controlling light scattering and emission at subwavelength scale with plasmonic nanopatch antennas (Presentation Recording)", Proc. SPIE 9547, Plasmonics: Metallic Nanostructures and Their Optical Properties XIII, 95471X (5 October 2015); https://doi.org/10.1117/12.2187309

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KEYWORDS

Plasmonics

Light scattering

Antennas

Nanoparticles

Finite-difference time-domain method

Quantum efficiency

Nanophotonics

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