The Preparation Of Large-area Flexible Magnesium Plasmons And The Study Of Their Adjustable Properties

Surface plasmon(SP)is the resonant oscillation of conduction electrons at the interface between negative and positive permittivity materials stimulated by electromagnetic field.It includes Localized Surface Plasmon Resonance(LSPR)and Surface Plasmon Polariton(SPP).Surface plasmon devices usually consist of noble metals or heavily doped semiconductor micro/nano structures,the excitation exists at the interface between the dielectric and the metal material.The surface plasmon resonance properties are determined by the plasmonic materials property,the dimension and shape of nanostructure,the interparticle distance and environmental dielectric constants.Since the light can be highly concentrated into the nano-sized regime and enhance the electrical field near the plasmonic surface,plasmonics have realized many important applications such as sub-wavelength waveguide,optical metamaterials,sub-wavelength imaging technology and biochemical molecule sensing etc.With the progress in nanofabrication technology,the extraordinary optical properties of surface plasmons and their huge application potential have become one of the most scientific and exploratory direction in nanophotonic research.Since most nanoplasmonic devices are limited by the high fabrication cost,small area and rigid substrate,and it is also very challenging to obtain plasmonic responses and tunable optical properties in the visible wavelength regime,thus the real daily applications of plasmonics devices are still rare.By applying soft nanoimprint lithography technique and novel magnesium plasmonic mateirals,we have successfully fabricated a low cost and large area magnesium plasmonic device that is flexible and tunable with high structural precision and tunable optical properties.By making use of the transient property of magnesium in water,we realize well-controlled dimension change and resonance tuning of magnesium plasmonics with different reaction time.By comparing with the Finite Element Modeling results,we revealed the resonance tuning mechanism of the transient magnesium plasmonics.We have also showed highly sensitive and accurate ambient humidity sensing application and skin wearable sweat loss monitoring by both transmittance measurement and device color change.With future integration of dissolvable semiconductor and dielectric mateirals,we can realize a fully tunable and transient optical circuits which would complement the transient electronic technology.