Effect of surface plasmon coupling with radiating dipole on the polarization characteristics of AlGaN-based light-emitting diodes  

作　　者：Yi Li Mei Ge Meiyu Wang Youhua Zhu Xinglong Guo 李毅;葛梅;王美玉;朱友华;郭兴龙(School of Information Science and Technology&Tongke School of Microelectronics,Nantong University,Nantong 226019,China)

机构地区：[1]School of Information Science and Technology&Tongke School of Microelectronics,Nantong University,Nantong 226019,China

出　　处：《Chinese Physics B》2022年第7期573-578,共6页中国物理B（英文版）

基　　金：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)。

摘　　要：The optical polarization characteristics of surface plasmon(SP)coupled Al Ga N-based light emitting diodes(LEDs)are investigated theoretically by analyzing the radiation recombination process and scattering process respectively.For the Al_(0.5)Ga_(0.5)N/Al/Al_(2)O_(3)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 Al_(0.5)Ga_(0.5)N/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.

关 键 词：surface plasmon AlGaN-based light emitting diodes FDTD K-P method 

分 类 号：O53[理学—等离子体物理] TN312.8[理学—物理]