Cascade GaN-based micro-photodiodes for photonic integration. (6th October 2022)

• Record Type: Journal Article
• Authors: Wang, Bin; Liang, Shihao; Yu, Junchi; Xu, Feifan; Zhang, Dongqi; Tao, Tao; Zhi, Ting; Liu, Xiaoyan; Zhuang, Zhe; Xie, Zili; Liu, Bin; Zhang, Rong
• Is Part Of: Journal of physics. Volume 55:Number 40(2022)
• Publication Date: 2022-10-06
• Subjects: VLC -- photonic integrated circuit -- cascade -- PD; Physics -- Periodicals; 530
• DOI: 10.1088/1361-6463/ac818a
• Languages: English
• ISSNs: 0022-3727

Abstract

Abstract: Photonic integrated circuit have attracted increasing attentions in many applications, such as visible light communication (VLC), optical on-chip interconnects, etc. In this work, we focus the study on photonic integration of GaN-based light-emitting diode (LED) and photodiode (PD). Integrated LED and multi-stage cascade PDs were designed and fabricated. Experimental results have demonstrated that the equivalent capacitance decreases continuously as the number of PD stages increasing. Compared to a single PD, the four-stage cascade PD can reduce the equivalent capacitance by 60%, making the cut-off frequency increased by 37%. Meanwhile, the cascade technique greatly reduces the dark current down to 20 pA and further improves the photo-to-dark current ratio up to 1.2 × 10 6 under a negative 5 V bias. Thus, the finding and experimental results in this work could enable a noval method to further improve VLC performances of photonic integrated devices.