Hayat Anwer, Cui Libin, Liang Han, Zhang Shuai, Zhiyang Xu, Khan Muhammad Ali, Aziz Gohar, Zhai Tianrui
Opt Express. 2021 May 10;29(10):15145-15158. doi: 10.1364/OE.422288.
Global research on the solution-processable colloidal quantum dots (CQDs) constitutes outstanding model systems in nanoscience, micro-lasers, and optoelectronic devices due to tunable color, low cost, and wet chemical processing. The two-dimensional (2D) CQDs quasicrystal lasers are more efficient in providing coherent lasing due to radiation feedback, high-quality-factor optical mode, and long-range rotational symmetry. Here, we have fabricated a 2D quasicrystal exhibiting 10-fold rotational symmetry by using a specially design pentagonal prism in the optical setup of a simple and low-cost holographic lithography. We developed a general analytical model based on the cavity coupling effect, which can be used to explain the underlying mechanism responsible for the multi-wavelength lasing in the fabricated 2D CQDs holographic photonic quasicrystal. The multi-wavelength surface-emitting lasers such as λ = 629.27 nm, λ = 629.85 nm, λ = 629.06 nm, λ = 630.17 nm, and λ = 628.76 with a coupling constant κ = 0.38 achieved from the 2D holographic photonic quasicrystal are approximately similar with the developed analytical model based on cavity coupling effect. Moreover, the lasing patterns of the 2D CQDs photonic quasicrystal laser exhibit a symmetrical polarization effect by rotating the axis of polarization with a difference of 120 angle in a round trip. We expect that our findings will provide a new approach to customize the 2D CQDs holographic photonic quasicrystal lasers in the field of optoelectronic devices and miniature lasing systems.
由于可调节颜色、低成本以及湿化学处理方法，全球对溶液可加工胶体量子点（CQDs）的研究在纳米科学、微型激光器和光电器件领域构成了杰出的模型系统。二维（2D）CQDs准晶体激光器由于辐射反馈、高品质因子光学模式和长程旋转对称性，在提供相干激光方面效率更高。在这里，我们通过在简单且低成本的全息光刻光学装置中使用特殊设计的五角棱镜，制造出了具有10重旋转对称性的二维准晶体。我们基于腔耦合效应开发了一个通用分析模型，该模型可用于解释在制造的二维CQDs全息光子准晶体中产生多波长激光的潜在机制。从二维全息光子准晶体获得的耦合常数κ = 0.38的多波长表面发射激光器，如λ = 629.27 nm、λ = 629.85 nm、λ = 629.06 nm、λ = 630.17 nm和λ = 628.76，与基于腔耦合效应开发的分析模型大致相似。此外，二维CQDs光子准晶体激光器的激光模式通过在往返过程中以120°的角度差旋转偏振轴表现出对称偏振效应。我们期望我们的发现将为在光电器件和微型激光系统领域定制二维CQDs全息光子准晶体激光器提供一种新方法。
