Nano-optical antenna sensor based on localized surface plasmon resonance

Accurate analysis of dissolved trace gases in transformer oil is an important technical to the power transformer operation and maintenance intelligently. Detection of multiple gases (hydrogen, carbon monoxide, carbon dioxide, methane, acetylene, ethylene and ethane) is the key of incipient transformer faults diagnosis based on dissolved gas analysis (DGA). The gas sensor based on localized surface plasmon resonance (LSPR) characteristics of metal nanoparticles has a wide use in gas detection. In this paper, taking hydrogen as a target gas, the optical properties of gold nanoparticle array on palladium film with hydrogen were investigated through finite difference time domain method. Palladium film hydrogen sensor based on gold nanoparticle array was designed. The simulation of extinction spectrum indicated the sensitivity of this hydrogen sensor could be greatly influenced by the size and gap of gold nanoparticles due to optical nano antenna effect. By analyzing the peak shift of extinction spectrum, the best structure of gold nanoparticle array on palladium film was obtained. Different concentration of hydrogen has different peak shift of extinction spectrum, this is an excellent characteristic for quantitative analysis by use of nano-optical Antenna Sensor Based on Localized Surface Plasmon Resonance.