Broadband Quantum Dot Superluminescent Diode with Simultaneous Three-State Emission

Nanomaterials

Hongmei Chen¹  Hao Dai²  Cheng Jiang³  Ziyang Zhang³  Zhonghui Yao³  Hongpei Wang³  Xiaohui Li⁴ 

[1] Qingdao Yichen Leishuo Technology Co., Ltd., Qingdao 266000, China;School of Electronic and Information Engineering, Qingdao University, Qingdao 266071, China;School of Nano-Tech and Nano-Bionics, University of Science and Technology of China, Hefei 230026, China;School of Physics & Information Technology, Shaanxi Normal University, Xi’an 710119, China;

关键词: molecular beam epitaxy;    quantum dots;    superluminescent light-emitting diodes;    optical coherence tomography;    excited states;   

DOI  :  10.3390/nano12091431

来源: DOAJ

【 摘 要 】

Semiconductor superluminescent light-emitting diodes (SLEDs) have emerged as ideal and vital broadband light sources with extensive applications, such as optical fiber-based sensors, biomedical sensing/imaging, wavelength-division multiplexing system testing and optoelectronic systems, etc. Self-assembled quantum dots (SAQDs) are very promising candidates for the realization of broadband SLED due to their intrinsic large inhomogeneous spectral broadening. Introducing excited states (ESs) emission could further increase the spectral bandwidth. However, almost all QD-based SLEDs are limited to the ground state (GS) or GS and first excited state (ES₁) emission. In this work, multiple five-QD-layer structures with large dot size inhomogeneous distribution were grown by optimizing the molecular beam epitaxy (MBE) growth conditions. Based on that, with the assistance of a carefully designed mirror-coating process to accurately control the cavity mirror loss of GS and ESs, respectively, a broadband QD-SLED with three simultaneous states of GS, ES₁ and second excited-state (ES₂) emission has been realized, exhibiting a large spectral width of 91 nm with a small spectral dip of 1.3 dB and a high continuous wave (CW) output power of 40 mW. These results pave the way for a new fabrication technique for high-performance QD-based low-coherent light sources.

【 授权许可】

Unknown