腔增强型太赫兹指纹探测
Cavity enhanced terahertz fingerprint detection with ultrahigh sensitivity
摘要：
我们提出了一种实现超高灵敏度太赫兹指纹检测的新方案。代替在常规透射方案中使用通过裸样品的太赫兹的直接吸收，使用在样品的特征频率处谐振的腔模式，并且由于腔模式透射对材料损耗的高度依赖性，当样品被加载到腔中时观察到放大的透射衰减。此外，该方案保留了物质识别的特点。以一维光子晶体谐振腔为例，对α-乳糖进行了检测，实现了对7 nm α-乳糖的高效检测，其特征频率为0.529THz，相当于自由空间波长的1/80000，灵敏度比常规方法提高了500倍。
英文摘要：
We report a new scheme of realizing terahertz fingerprint detection with ultrahigh sensitivity. Instead of using the direct absorption of terahertz through a bare sample in the regular transmission scheme, a cavity mode resonating at the characteristic frequency of the sample is used and due to the high dependence of the cavity mode transmission on the material loss, an amplified transmission decaying is observed when the sample is loaded into the cavity. Furthermore, this scheme retains the feature of substance identification. A one-dimensional photonic crystal cavity is used as the example for the detection of α-lactose and an efficient detection of 7nm α-lactose can be achieved, which corresponds to 1/80000 of the free space wavelength at the characteristic frequency of 0.529THz, exhibiting sensitivity 500 times higher than the regular method.
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