Work

Evaluating the blue-shift behaviors of the surface plasmon coupling of an embedded light emitter with a surface Ag nanoparticle by adding a dielectric interlayer or coating

Year: 2015

Type: article

Abstract: The surface plasmon (SP) coupling behaviors of an embedded light emitter or radiating dipole in GaN with a surface Ag nanoparticle (NP) in four structures of different added dielectric geometries, including an extended dielectric interlayer (DI) and a DI of a finite width between the Ag NP and GaN, a dielectric coating on the Ag NP, and no dielectric addition, are numerically compared. Either an added DI or dielectric coating can lead to the blue shift of localized surface plasmon (LSP) dipole resonance peak or the spectral peak of radiated power enhancement ratio with respect to that of the structure without dielectric addition. A smaller dielectric refractive-index or a larger dielectric thickness results in a larger blue-shift range. Under the condition of the same dielectric refractive-index and thickness, the structure of a DI with a finite width leads to the largest blue-shift range, followed by the structure of an extended DI and then the structure of a dielectric coating. In a practical application, for a given emission wavelength of a blue-emitting quantum well, the emission enhancement effect through SP coupling depends on the LSP resonance strength at this wavelength. Our study also shows that although the LSP resonance peak can be blue-shifted by reducing the size of a surface Ag NP, its SP coupling strength is dramatically reduced. Adding a DI or dielectric coating is a more practical approach for shifting the major LSP resonance mode of a surface Ag NP from the green into blue range.

Source: Optics Express

DOI: 10.1364/oe.23.030709

Authors: Yang Kuo, Wen-Yen Chang, Chun-Han Lin, C. C. Yang, Yean-Woei Kiang

Language: English

Topic: Plasmonic and Surface Plasmon Research

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,270

Funder: Ministry of Science and Technology, Taiwan

Awards: Theoretical and Numerical Study of Surface Plasmon Coupling Behaviors of a Radiating Dipole near a Metal Surface, Techniques for Enhancing the Efficiency of a Long-Wavelength Nitride-Based Light-Emitting Diode with Nanostructures( III ), Numerical Simulation on the Radiation Characteristics of Oscillating Dipoles in Periodic Nano-Structures, Investigation of Surface Plasmon Coupling Mechanisms in a Light-Emitting Diode