Coupling of a light-emitting diode with surface plasmon polariton or localized surface plasmon induced on surface silver gratings of different geometries
| Autor: | Wen-Yen Chang, Yu-Feng Yao, Charng-Gan Tu, Chih-Chung Yang, Chun-Han Lin, Yean-Woei Kiang, Chen-Yao Chao, Chia-Ying Su |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
business.industry Physics::Optics Resonance 02 engineering and technology Grating 021001 nanoscience & nanotechnology 01 natural sciences Surface plasmon polariton Atomic and Molecular Physics and Optics law.invention 010309 optics Wavelength Optics law 0103 physical sciences Quantum efficiency 0210 nano-technology business Quantum well Localized surface plasmon Light-emitting diode |
| Zdroj: | Optics express. 26(7) |
| ISSN: | 1094-4087 |
| Popis: | A metal grating on top of a light-emitting diode (LED) with a designed grating period for compensating the momentum mismatch can enhance the surface plasmon polariton (SPP) coupling effect with the quantum wells (QWs) to improve LED performance. Here, we demonstrate the experimental results showing that the induced localized surface plasmon (LSP) resonance on such a metal grating can dominate the QW coupling effect for improving LED performance, particularly when grating ridge height is large. The finding is illustrated by fabricating Ag gratings on single-QW, green-emitting LEDs of different p-type thicknesses with varied grating ridge height and width such that the distance between the grating ridge tip and the QW can be controlled. Reflection spectra of the Ag grating structures are measured and simulated to identify the SPP or LSP resonance behaviors at the QW emission wavelength. The measured results of LED performances show that in the LED samples under study, both SPP and LSP couplings can lead to significant enhancements of internal quantum efficiency and electroluminescence intensity. At the designated QW emission wavelength, with a grating period theoretically designed for momentum matching, the LSP coupling effect is stronger, when compared with SPP coupling. |
| Databáze: | OpenAIRE |
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