CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Effect of surface plasmon coupling with radiating dipole on the polarization characteristics of AlGaN-based light-emitting diodes |
Yi Li(李毅)†, Mei Ge(葛梅), Meiyu Wang(王美玉), Youhua Zhu(朱友华), and Xinglong Guo(郭兴龙) |
School of Information Science and Technology&Tongke School of Microelectronics, Nantong University, Nantong 226019, China |
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Abstract The optical polarization characteristics of surface plasmon (SP) coupled AlGaN-based light emitting diodes (LEDs) are investigated theoretically by analyzing the radiation recombination process and scattering process respectively. For the Al0.5Ga0.5N/Al/Al2O3 slab structure, the relative intensity of TE-polarized and TM-polarized spontaneous emission (SE) rate into the SP mode obviously depends on the thickness of the Al layer. The calculation results show that TM dominated emission will be transformed into TE dominated emission with the decrease of the Al thickness, while the emission intensities of both TE/TM polarizations will decrease significantly. In addition, compared with TM polarized emission, TE polarized emission is easier to be extracted by SP coupling. For the Al0.5Ga0.5N/Al nano-particle structure, the ratio of transmittance for TE/TM polarized emission can reach ~3.06, while for the Al free structure, it is only 1.2. Thus, the degree of polarization of SP coupled LED can be improved by the reasonable structural design.
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Received: 18 October 2021
Revised: 03 January 2022
Accepted manuscript online: 19 January 2022
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PACS:
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78.66.Fd
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(III-V semiconductors)
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78.67.De
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(Quantum wells)
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78.67.-n
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(Optical properties of low-dimensional, mesoscopic, and nanoscale materials and structures)
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78.67.Pt
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(Multilayers; superlattices; photonic structures; metamaterials)
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Fund: This work was supported by the National Nature Science Foundation of China (Grant Nos. 62004109, 61874168, and 62074086), Jiangsu Provincial Double-Innovation Doctor Program, Development of antibacterial multifunctional PVC facing new material technology (Grant No. 21ZH626). |
Corresponding Authors:
Yi Li
E-mail: liyi2016@ntu.edu.cn
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Cite this article:
Yi Li(李毅), Mei Ge(葛梅), Meiyu Wang(王美玉), Youhua Zhu(朱友华), and Xinglong Guo(郭兴龙) Effect of surface plasmon coupling with radiating dipole on the polarization characteristics of AlGaN-based light-emitting diodes 2022 Chin. Phys. B 31 077801
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