A5021857976- Photonic Crystals and Applications
- Photonic and Optical Devices
- Plasmonic and Surface Plasmon Research
- Optical Coatings and Gratings
- Phase-change materials and chalcogenides
- Nanofabrication and Lithography Techniques
- Liquid Crystal Research Advancements
- Nonlinear Optical Materials Studies
- Adhesion, Friction, and Surface Interactions
- Mineralogy and Gemology Studies
- Metal and Thin Film Mechanics
- Pickering emulsions and particle stabilization
Iowa State University
2018-2021
We extend the patterning capability of laser interference lithography (LIL) to fabricate complex two-dimensional quasicrystal lattices, superlattices, and Moiré lattices. Traditional is typically used create single-pitch linear gratings or simple square hexagonal patterns. In this work, we demonstrate how using multiple exposures at various defined orientations with different pitch values results in a cumulative surface pattern that encompasses diverse group lattice structures. fabrication...
We demonstrate how distinct surface plasmon resonance modes on opposite sides of a metal-coated grating can be coupled across the metal film. This coupling occurs by matching conditions each side tuning refractive index directly adjacent to In first example, we deposited high layer tin oxide top red-shift front until it with backside semitransparent ∼45 nm thin silver grating. By shifting condition nearby plasmon, this coating creates an effective wave vectors film, allowing them couple and...
This paper reports a tunable photonic device that incorporates thin layer of phase-change material, Ge2Sb2Te5 (GST), in crystal (PC) structure. The PC structure is based on one-dimensional grating waveguide with metal cladding. metal-cladded supports guided-mode resonance (GMR) selectively absorbs light at particular wavelength. Inserting the GST material into gating makes it possible to control GMR mode. Here, GST-PC was numerically designed and optimized obtain significant tuning mode...
We report a method for controlling the lattice geometry of monodisperse colloidal crystals formed by confined convective self-assembly on substrate patterned with chirped surface relief grating. Chirped gratings were fabricated using laser interference lithography and curved mirror reflector to create photoresist patterns pitch values ranging from ∼500 >10 000 nm spread over planar surface. These nanostructures are shown guide formation various geometries not normally found via assembly...