Cheng Haodong, Qu Junyu, Mao Wangqi, Chen Shula, Dong Hongxing
Key Laboratory for Micro-Nano Physics and Technology of Hunan Province, College of Materials Science and Engineering, Hunan University, Changsha 410082, China.
Hunan Institute of Optoelectronic Integration, Hunan University, Changsha 410082, China.
Nanomaterials (Basel). 2024 Mar 30;14(7):614. doi: 10.3390/nano14070614.
Micro/nano photonic barcoding has emerged as a promising technology for information security and anti-counterfeiting applications owing to its high security and robust tamper resistance. However, the practical application of conventional micro/nano photonic barcodes is constrained by limitations in encoding capacity and identification verification (e.g., broad emission bandwidth and the expense of pulsed lasers). Herein, we propose high-capacity photonic barcode labels by leveraging continuous-wave (CW) pumped monolayer tungsten disulfide (WS) lasing. Large-area, high-quality monolayer WS films were grown via a vapor deposition method and coupled with external cavities to construct optically pumped microlasers, thus achieving an excellent CW-pumped lasing with a narrow linewidth (0.39 nm) and a low threshold (400 W cm) at room temperature. Each pixel within the photonic barcode labels consists of closely packed WS microlasers of varying sizes, demonstrating high-density and nonuniform multiple-mode lasing signals that facilitate barcode encoding. Notably, CW operation and narrow-linewidth lasing emission could significantly simplify detection. As proof of concept, a 20-pixel label exhibits a high encoding capacity (2.35 × 10). This work may promote the advancement of two-dimensional materials micro/nanolasers and offer a promising platform for information encoding and security applications.
微纳光子条形码技术因其高安全性和强大的抗篡改能力，已成为信息安全和防伪应用领域一项颇具前景的技术。然而，传统微纳光子条形码的实际应用受到编码容量和识别验证方面的限制（例如，发射带宽宽以及脉冲激光成本高）。在此，我们利用连续波（CW）泵浦的单层二硫化钨（WS）激光发射，提出了高容量光子条形码标签。通过气相沉积法生长大面积、高质量的单层WS薄膜，并与外腔耦合以构建光泵浦微激光器，从而在室温下实现了具有窄线宽（约0.39 nm）和低阈值（约400 W cm）的优异连续波泵浦激光发射。光子条形码标签内的每个像素由紧密排列的不同尺寸的WS微激光器组成，展示出高密度且不均匀的多模激光信号，便于进行条形码编码。值得注意的是，连续波操作和窄线宽激光发射可显著简化检测过程。作为概念验证，一个20像素的标签展现出高编码容量（2.35×10）。这项工作可能会推动二维材料微纳激光器的发展，并为信息编码和安全应用提供一个有前景的平台。
