Zhang Wenxing, Xu Anqi, Zhou Xin, Zhang Dan, Li Honglin
Chongqing Key Laboratory of Photo-Electric Functional Materials, College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 401331, China.
Materials (Basel). 2024 Aug 19;17(16):4103. doi: 10.3390/ma17164103.
Traditional optical communication systems rely on single narrow-band PDs, which can expose confidential information and data to potential eavesdropping in free space. With advancements in technology, even optical communication in the UV spectrum, invisible to the sun, faces risks of interception. Consequently, broad-band PDs that combine optical encryption with algorithmic encryption hold significant promise for secure and reliable communication. This study presents a photodetector based on TiO-α-GaO heterostructures, prepared via direct oxidation and hydrothermal reaction, demonstrating self-powered UVC/UVA broad-band detection capabilities. The PD exhibits response peaks at approximately 250 and 320 nm, with R of 42.16 and 59.88 mA/W and D* of 8.21 × 10 and 9.56 × 10 Jones, respectively. Leveraging the superior optical response characteristics of UVC and UVA wavelengths, this device has been employed to develop a communication system designed for data transmission. The proposed system features two independent channels: one for data transmission using UVC and another for key distribution using UVA. Secure communication is ensured through specialized encryption algorithms. In summary, this work offers a straightforward, cost-effective, and practical method for fabricating self-powered UVC/UVA broad-band PDs. This PD provides new insights into the development of multi-purpose, multi-band secure optical communication devices and holds promise for integration into multifunctional optoelectronic systems in the future.
传统的光通信系统依赖于单个窄带光电探测器，这可能会使机密信息和数据在自由空间中面临潜在的窃听风险。随着技术的进步，即使是在太阳不可见的紫外光谱中的光通信也面临着被拦截的风险。因此，将光学加密与算法加密相结合的宽带光电探测器对于安全可靠的通信具有重要意义。本研究提出了一种基于TiO-α-GaO异质结构的光电探测器，通过直接氧化和水热反应制备，展示了自供电的UVC/UVA宽带探测能力。该光电探测器在约250和320 nm处呈现响应峰值，响应率分别为42.16和59.88 mA/W，探测率分别为8.21×10和9.56×10 Jones。利用UVC和UVA波长优异的光学响应特性，该器件已被用于开发一种用于数据传输的通信系统。所提出的系统具有两个独立的通道：一个用于使用UVC进行数据传输，另一个用于使用UVA进行密钥分发。通过专门的加密算法确保安全通信。总之，这项工作为制造自供电的UVC/UVA宽带光电探测器提供了一种简单、经济高效且实用的方法。这种光电探测器为多功能、多波段安全光通信设备的开发提供了新的见解，并有望在未来集成到多功能光电子系统中。
