In this paper, we show that plasmonic nanostructures, aka, metasurfaces, have robust performance in killing bacteria via the photothermal mechanism. Due to the highly enhanced local electric field, they can simultaneously provide impressive electric field enhancement for molecular sensing using various spectroscopic techniques.
Hyperspectral chemical imaging (HCI) refers to the acquisition of both spatial and spectral information in a single acquisition time frame. HCI is a parallel scheme that allows the collection of spatially-resolved chemical/compositional data at much higher rate compared to traditional chemical imaging which is serial in nature. Recent advances in spatial light modulators (SLM) have enabled many novel HCI imaging schemes. We have implemented several HCI systems using reflective and diffractive SLMs. Their design and performance characterization will be discussed in this talk.
Plasmonic nanomaterials are known to concentrate incident light to their surfaces by collective electron oscillation.
Plasmonic hot-spot refers to locations where electromagnetic fields are particularly enhanced relative to the incident
field. Traditional plasmonic nanomaterials are 1D (e.g., colloidal nanoparticles) or 2D (lithographically patterned
nanostructure arrays) in nature, which typically result in sparse field concentration patterns. To improve efficiency and
better utilization of hot-spots, we investigate 3D plasmonic nanoarchitecture where abundant hot-spots are formed in a
3D volumetric fashion, a feature drastically departing from traditional nanostructures.