The prompt identification of organic solvents is essential in many practical scenarios. This work introduces a compact optical device for rapid, non-contact detection of organic solvents. The fabrication of the GaN chip employs a monolithic integration approach, enabling the simultaneous formation of on-chip components responsible for light emission and light detection. The self-assembled polystyrene (PS) spheres embedded in a polydimethylsiloxane (PDMS) layer as photonic crystals can effectively induce distinct optical changes when exposed to organic solvents. By analyzing the magnitude and recovery time of the photocurrent signals, up to seven types of organic samples can be distinguished. Different from traditional optical sensing systems, the proposed chip-level integration strategy eliminates the need for external assembly of optical components, resulting in an ultracompact millimeter-sized sensing unit. The developed device also offers features of simplicity of use and a short measurement time of less than 10 s, making it a feasible solution for quick detection in emergency scenarios.

中文翻译：

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快速、非接触式识别有机溶剂：集成 PDMS/PS 光子晶体的单片 GaN 芯片


在许多实际场景中，有机溶剂的及时识别至关重要。这项工作介绍了一种紧凑的光学装置，用于快速、非接触式检测有机溶剂。 GaN芯片的制造采用单片集成方法，能够同时形成负责光发射和光检测的片上组件。作为光子晶体嵌入聚二甲基硅氧烷（PDMS）层中的自组装聚苯乙烯（PS）球体在暴露于有机溶剂时可以有效地诱导明显的光学变化。通过分析光电流信号的幅度和恢复时间，可以区分多达七种类型的有机样品。与传统的光学传感系统不同，所提出的芯片级集成策略消除了外部组装光学元件的需要，从而形成超紧凑的毫米级传感单元。所开发的设备还具有使用简单、测量时间小于10秒的特点，使其成为紧急情况下快速检测的可行解决方案。