Observation of distributed feedback lasing in silicon nanocrystals under electrical pumping

Results in Physics

Song-You Wang¹  Yu-Chen Zhang²  Kai-Xin Liu²  Feng-Yang Ma²  Ming Lu²  Zhi-Yuan Yu²  Xia-Yan Xue²  Jian Sun² 

[1] Yiwu Research Institute of Fudan University, Chengbei Road, Yiwu City, Zhejiang 322000, China;Department of Optical Science and Engineering, and Shanghai Ultra-Precision Optical Manufacturing Engineering Center, Fudan University, Shanghai 200433, China;

关键词: Silicon nanocrystals;    Lasing;    Electrical pumping;    Distributed feedback;   

DOI  :  

来源: DOAJ

【 摘 要 】

Electrically pumped distributed feedback (DFB) lasing in silicon nanocrystals (SiNCs) has been observed. The DFB SiNC laser was made based on a SiNC light-emitting diode (LED) by incorporating a second-order DFB grating. The light emission covered the visible regime. Optical gains in the order of 102 cm−1 were found in the light emitting regime. The DFB grating was so designed and fabricated that lasing wavelength in the red regime was selected. Signals emitting from the surface of the DFB SiNC laser were recorded. The laser was pumped by a pulsed direct-current power supply at room temperature. Four typical criteria of lasing were identified, i.e., 1) threshold behavior of the electroluminescence (EL) intensity versus pumping power density, 2) evident spectral narrowing of the EL spectrum, 3) well-recognized degree of polarization, and 4) small spread of light emitting angle. The latter three were for the pumping power density beyond the threshold one.

【 授权许可】

Unknown