This Letter reports a demonstration of integrating a tiny GaN-based photonic chip with a PDMS microfluidics system. The photonic chip containing InGaN/GaN quantum wells is responsible for light emission and photodetection and fabricated through standard microfabrication techniques. The PDMS-enclosed chip is formed adjacent to the fluidic channel and operates in reflection mode, enabling the optical signals coupled into and out of the fluidic channel without the aid of external optics. The luminescence and photo-detecting properties are thoroughly characterized, confirming that the chip is capable of tracking the continuously flowing microdroplets with the changes of absorbance, length, and flow rate. The novel, to the best of our knowledge, photonic integration presented in this Letter is a significant step forward in the development of compact, miniature, and self-contained on-chip sensing systems, which are of great value in portable lab-on-a-chip applications.

中文翻译：

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GaN基光子芯片与微流控系统的紧凑集成

这封信报道了将基于GaN的微型光子芯片与PDMS微流控系统集成的演示。包含InGaN / GaN量子阱的光子芯片负责光发射和光检测，并通过标准微加工技术制造。封闭PDMS的芯片形成为与流体通道相邻，并以反射模式工作，从而无需外部光学器件即可将光信号耦合进出流体通道。充分表征了发光和光检测特性，证实了该芯片能够随着吸光度，长度和流速的变化跟踪连续流动的微滴。就我们所知，这封小说所介绍的光子集成是紧凑型电子技术发展的重要一步，