论文标题
双重共振光声学光谱：超高灵敏度符合超宽的动态范围
Doubly resonant photoacoustic spectroscopy: ultra-high sensitivity meets ultra-wide dynamic range
论文作者
论文摘要
在能源，环境，安全性和公共卫生中，希望在广泛的应用中，希望具有较高灵敏度，动态范围，低成本和小占地面积的基于光声光谱（PAS）的气体传感器。但是，大多数作品都集中在声学谐振器上，以增强声波或光学谐振器以增强光波。本文中，我们基于双谐振PAS开发了一个气体传感器，在该PA中，使用厘米长的构型使用组合的光学和声音谐振器同时增强声波和光波。不仅通过双驻波波增强了较低的检测极限，而且由于较短的谐振器，上的检测极限也会扩大。例如，我们通过检测乙炔（C2H2）来开发传感器，从而达到5.7*10-13 cm-1的噪声等效吸收和八个阶的动态范围。与最先进的PAS气体传感器相比，开发的传感器将灵敏度提高了两个数量级，并将动态范围扩展到三个数量级。此外，提出了一种激光 - 腔体 - 分子锁定策略，以提供快速气体检测的额外灵活性。
Photoacoustic spectroscopy (PAS) based gas sensors with high sensitivity, wide dynamic range, low cost, and small footprint are desirable across a broad range of applications in energy, environment, safety, and public health. However, most works have focused on either acoustic resonator to enhance acoustic wave or optical resonator to enhance optical wave. Herein, we develop a gas sensor based on doubly resonant PAS in which the acoustic and optical waves are simultaneously enhanced using combined optical and acoustic resonators in a centimeter-long configuration. Not only the lower detection limit is enhanced by the double standing waves, but also the upper detection limit is expanded due to the short resonators. As an example, we developed a sensor by detecting acetylene (C2H2), achieving a noise equivalent absorption of 5.7*10-13 cm-1 and a dynamic range of eight orders. Compared to the state-of-the-art PAS gas sensors, the developed sensor increases the sensitivity by two orders of magnitude and extends the dynamic range by three orders of magnitude. Besides, a laser-cavity-molecule locking strategy is proposed to provide additional flexibility of fast gas detection.
