We present a facile and effective method for fabrication of the localized surface plasmon resonance (LSPR) optical fiber sensor assisted by two polydopamine (PDA) layers with enhanced plasmonic sensing performance. The first PDA layer was self-polymerized onto the bare optical fiber to provide the catechol groups for the reduction from Ag+ to Ago through chelating and redox activity. As the reduction of Ag+ proceeds, Ag nanoparticles (NPs) were grown in-situ on the PDA layer with uniform distribution. The second PDA layer was applied to prevent Ag NPs from oxidating and achieve an improvement of LSPR signal. The PDA/Ag/PDA-based optical fiber sensor has an enhanced LSPR sensitivity of 961 nm/RIU and excellent oxidation resistance. The stable PDA/Ag/PDA-based LSPR sensor with high optical performance is very promising for future application in optical sensing field.

通过场(原子)约化熵、量子相对熵研究了各种双模非经典光场(包括纠缠相干态、对相干态、 双模压缩真空态)与Ξ 型三能级原子作用时的纠缠特性,讨论了原子初态和光场参数的影响,并与赝自旋算符构造的贝尔 算符期待值进行了对比。结果表明:熵与贝尔算符期待值具有相似的演化趋势;相对于贝尔算符期待 值,熵更易受原子相干性的影响;纠缠最大时非局域性也最大,纠缠最小时贝尔算符期待值并不是最小。 在贝尔算符期待值较小时纠缠仍可能较大,这说明纠缠和非局域是量子世界中既相互关联又独立的2个不同属性。