Abstract
Nanophotonic technique has been attracting much attention in applications of nano-bio-chemical sensing and energy conversion of solar energy harvesting and enhanced energy transfer. One approach for nano-bio-chemical sensing is surface plasmon resonance (SPR) imaging, which can detect the material properties, such as density, ion concentration, temperature, and effective refractive index in high sensitivity, label-free, and real-time under ambient conditions. Recent study shows that SPR can successfully detect the concentration variation of nanofluids during evaporation-induced self-assembly process. Spoof surface plasmon resonance based on multilayer metallo-dielectric hyperbolic metamaterials demonstrate SPR dispersion control, which can be combined with SPR imaging, to characterize high refractive index materials because of its exotic optical properties. Furthermore, nano-biophotonics could enable innovative energy conversion such as the increase of absorption and emission efficiency and the perfect absorption. Localized SPR using metal nanoparticles shows highly enhanced absorption in solar energy harvesting. Three-dimensional hyperbolic metamaterial cavity nanostructure shows enhanced spontaneous emission. Recently ultrathin film perfect absorber is demonstrated with the film thickness as low as ~1/50th of the operating wavelength using epsilon-near-zero (ENZ) phenomena at the wavelength close to SPR. It is expected to provide a breakthrough in sensing and energy conversion applications using the exotic optical properties based on the nanophotonic technique.
Highlights
Recent sensing and energy conversion applications are reviewed using surface plasmon resonance and nanophotnic techniques
One is planar surface plasmon resonance (SPR) based on thin film [3,4,5,6,7] and the other is localized SPR based on nanoparticles [1,2]
Ultra-thin films with deep subwavelength thickness have been shown to have perfect absorption using epsilon-near-zero (ENZ) phenomena at the wavelength close to SPR, which is appealing for device applications as surface patterning or texturing is not required and it needs lower material consumption [29]
Summary
Recent sensing and energy conversion applications are reviewed using surface plasmon resonance and nanophotnic techniques. Intensity measurement at a fixed angle approach has several advantages compared with other methodologies It can provide real-time and full-field imaging, which is beneficial to monitor near-surface transport or optical property changes such as concentration, temperature, salinity, and effective refractive index [3,4,5,6,7], which is not possible with existing techniques. This technique can be more powerful if its sensitivity can be increased in order to monitor the fine ion change in bio applications through grating structure [18]. Ultra-thin films with deep subwavelength thickness have been shown to have perfect absorption using epsilon-near-zero (ENZ) phenomena at the wavelength close to SPR, which is appealing for device applications as surface patterning or texturing is not required and it needs lower material consumption [29]
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