The inverse Faraday effect is associated with light-induced magnetism. In nonmagnetic materials, the magnetic field scales with intensity; an electric field both produces surface charges and imparts momentum to those charges. The angular momentum of surface currents may induce a magnetic field, that is highly dependent on the shape nano-geometry. Here, we measure the Inverse Faraday Effect on nonmagnetic plasmonic nanodisks. We explore the effect of nanodisk aspect ratio. When the disk is thin, the plasmon resonance significantly red-shifts, which coincides with electron spillout.
An insect's response time to visual stimuli generally surpasses that of current autonomous machine vision systems with more complicated hardware. One hypothesis that we have considered is that insects’ extraordinary flight and navigation capabilities involve optical preprocessing from self-assembled, diffractive corneal optics. This paradigm parallels recent research in hybrid computer vision, which is of interest due to the growing computational costs of deep-learning-based image processing. Here, we summarize our research and motivation on fly-inspired diffractive optical encoding with conducting-polymer self-assembled polarimetric thin-film encoders. We emphasize the role of defects and vortex phase encoding and analyze the dipole scattering efficiency from nanofibrous structures.
Langmuir-Blodgett troughs provide an excellent system to deposit monolayer films onto flat and curved substrates. However, most trough designs use motorized barriers to compact the film, and it is difficult to fully eliminate the capillary waves and striations on deposited films caused by motorized barriers. Here, we present an inexpensive design for a benchtop LB trough that compresses the film without motorized barriers; instead, it is the trough's geometry that compresses the film in a drainage basin. We demonstrate this approach with a 3D printed drainage basin and with self-assembled polystyrene colloidal films on a range of 3D glass substrates: a jar, a bulb, and a compressor tube. We provide a mathematical formalism to coat 3D objects with arbitrary size and shape; especially with facile 3D printing, this concept may be extended in a cheap and modular approach.
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