Dielectric longitudinal bifocal metalens with adjustable intensity and high focusing efficiency: erratum

A protocol for the fabrication and optical characterization of dielectric metasurfaces is presented. This method can be applied to the fabrication of not only beam splitters, but also of general dielectric metasurfaces, such as lenses, holograms, and optical...

Disruption of the blood-spinal cord barrier (BSCB) can be successfully achieved with the intravenous administration of microbubbles and the application of low-intensity focused ultrasound (LIFU). This protocol details the opening of the BSCB using LIFU in a rodent model, including equipment setup, microbubble injection, target localization, and BSCB disruption visualization.

Sometimes we want to see how people change over time, as in studies of human development and lifespan. When we test the same group of individuals repeatedly over an extended period of time, we are conducting longitudinal research. Longitudinal research is a research design in which data-gathering is administered repeatedly over an extended period of time. For example, we may survey a group of individuals about their dietary habits at age 20, retest them a decade later at age 30, and then again...

This protocol demonstrates the controllable nucleation of cavitation in gel phantoms, through simultaneous exposure to both near-infrared pulsed laser light and high intensity focused ultrasound (HIFU). The cavitation activity can then be used for enhancing imaging and/or therapeutic uses of...

Source: Lee, Y. F., et al. An Ultrasonic Tool for Nerve Conduction Block in Diabetic Rat Models. J. Vis. Exp. (2017)This video demonstrates the use of high-intensity focused ultrasound (HIFU) to block action potentials from the sciatic nerve to the gastrocnemius muscle in a diabetic rat model. Upon delivering the HIFU beam to the nerve, a decrease in muscle signal confirms HIFU's potential as a non-invasive therapy for diabetic neuropathic pain...

Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...