Chhabindra Gautam, Mingsen Pan, Subhashree Seth, Thomas J. Rotter, Ming Zhou, Bradley J. Thompson, Ricky Gibson, Shanhui Fan, Ganesh Balakrishnan, Weidong Zhou
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引用次数: 0
摘要
作为一种新型半导体激光器,光子晶体表面发射激光器(PCSEL)具有大面积单模表面发射、高功率和高光束质量的特点。通过二维(2D)光子晶体腔的面内光反馈,实现了大面积有源区单模激光的独特功能。在较大的 PCSEL 腔中,基模和高阶模的激光增益阈值变得相似,从而降低了单模工作性能。在此,我们通过控制注入区域和增益模式相互作用,研究载流子注入对 PCSEL 模式的影响。我们进行了光学和电学模拟,以计算不同 p 电极设计的增益模式重叠系数。我们制作了 250 × 250 µm2 的光子晶体腔,采用不同尺寸的 p 电极来控制注入面积。PCSEL 器件的表征结果表明,电极尺寸与腔体边长比为 0.6 的器件具有最高的斜率效率和较低的激光阈值,并具有单叶光束轮廓。这种选择性载流子注入还能在 PCSEL 腔中产生增益导向共振,并在抑制高阶模式增益的同时提高基阶模式的光学增益。
Mode distribution impact on photonic crystal surface emitting laser performance
As a new type of semiconductor laser, photonic crystal surface-emitting lasers (PCSELs) feature large-area single-mode surface emission with high power and high beam quality. The unique features of single-mode lasing over a large area active region are implemented by the in-plane optical feedback from two-dimensional (2D) photonic crystal cavities. In larger PCSEL cavities, the lasing gain threshold becomes similar for the fundamental and high-order modes, which degrades single-mode operation. Here, we investigate the impact of carrier injection on PCSEL modes by controlling the injection area and the gain mode interaction. Optical and electrical simulations are carried out to calculate the gain mode overlapping factor for different p electrode designs. We fabricated 250 × 250 µm2 photonic crystal cavities with different p electrode sizes for injection area control. The PCSEL device characterization results show that devices with an electrode size to cavity side length ratio of 0.6 have the maximum slope efficiency and a lower lasing threshold with a single lobe beam profile. Such selective carrier injection can also provide gain-guided resonance in the PCSEL cavities and enhance optical gain in the fundamental mode while suppressing gain in the high-order modes.
APL PhotonicsPhysics and Astronomy-Atomic and Molecular Physics, and Optics
CiteScore
10.30
自引率
3.60%
发文量
107
审稿时长
19 weeks
期刊介绍:
APL Photonics is the new dedicated home for open access multidisciplinary research from and for the photonics community. The journal publishes fundamental and applied results that significantly advance the knowledge in photonics across physics, chemistry, biology and materials science.