Plasmon-free surface-enhanced Raman scattering(SERS)substrates have attracted tremendous attention for their abundant sources,excellent chemical stability,superior biocompatibility,good signal uniformity,and unique se...Plasmon-free surface-enhanced Raman scattering(SERS)substrates have attracted tremendous attention for their abundant sources,excellent chemical stability,superior biocompatibility,good signal uniformity,and unique selectivity to target molecules.Recently,researchers have made great progress in fabricating novel plasmon-free SERS substrates and exploring new enhancement strategies to improve their sensitivity.This review summarizes the recent developments of plasmon-free SERS substrates and specially focuses on the enhancement mechanisms and strategies.Furthermore,the promising applications of plasmon-free SERS substrates in biomedical diagnosis,metal ions and organic pollutants sensing,chemical and biochemical reactions monitoring,and photoelectric characterization are introduced.Finally,current challenges and future research opportunities in plasmon-free SERS substrates are briefly discussed.展开更多
商用WiFi接收模块可以提供比接收无线信号强度指示(received signal strength indication,RSSI)更细粒的信道状态信息(channel state information,CSI),利用3根天线获取CSI进行方位到达角(angle of arrival,AOA)估计已成为现实。利用正...商用WiFi接收模块可以提供比接收无线信号强度指示(received signal strength indication,RSSI)更细粒的信道状态信息(channel state information,CSI),利用3根天线获取CSI进行方位到达角(angle of arrival,AOA)估计已成为现实。利用正交频分复用技术(orthogonal frequency division multiplexing,OFDM)将2根天线拓展为60个虚拟天线阵,将前向平滑算法拓展到二维前向平滑算法。利用仿真的非相干信号源和相干信号源数据进行实验,结果表明,在只利用2根接收天线的前提下也能实现基于商用WiFi信号的方位角的AOA估计,所提出的2根天线的虚拟天线阵模型和二维前向平滑算法具有有效性和适用性。展开更多
基金the National Natural Science Foundation of China(Grant No.11874108)the National Key R&D Program of China(Grant No.2017YFA0403600)。
文摘Plasmon-free surface-enhanced Raman scattering(SERS)substrates have attracted tremendous attention for their abundant sources,excellent chemical stability,superior biocompatibility,good signal uniformity,and unique selectivity to target molecules.Recently,researchers have made great progress in fabricating novel plasmon-free SERS substrates and exploring new enhancement strategies to improve their sensitivity.This review summarizes the recent developments of plasmon-free SERS substrates and specially focuses on the enhancement mechanisms and strategies.Furthermore,the promising applications of plasmon-free SERS substrates in biomedical diagnosis,metal ions and organic pollutants sensing,chemical and biochemical reactions monitoring,and photoelectric characterization are introduced.Finally,current challenges and future research opportunities in plasmon-free SERS substrates are briefly discussed.
文摘商用WiFi接收模块可以提供比接收无线信号强度指示(received signal strength indication,RSSI)更细粒的信道状态信息(channel state information,CSI),利用3根天线获取CSI进行方位到达角(angle of arrival,AOA)估计已成为现实。利用正交频分复用技术(orthogonal frequency division multiplexing,OFDM)将2根天线拓展为60个虚拟天线阵,将前向平滑算法拓展到二维前向平滑算法。利用仿真的非相干信号源和相干信号源数据进行实验,结果表明,在只利用2根接收天线的前提下也能实现基于商用WiFi信号的方位角的AOA估计,所提出的2根天线的虚拟天线阵模型和二维前向平滑算法具有有效性和适用性。
