Semi-permeable resonant aluminum gratings for structural coloration in transmission.

The novel type of diffraction gratings consists of a semi-permeable corrugated aluminum film with periods supporting first-order diffraction in the visible wavelength range. These gratings exhibit coloring of the transmitted zeroth order due to excitation of surface plasmons. The hue depends on the angle of incidence and may be adjusted by varying the grating period.

A new parameter for the management of positional plagiocephaly: the size of the anterior fontanelle matters.

Purpose: The rate of positional plagiocephaly has increased since guidelines for the prevention of sudden infant death have led to the recommendation of positioning infants on their back during sleeping. Therapy includes repositioning, physiotherapy, and helmet therapy. To date, there is no consensus on the treatment of positional plagiocephaly.

Occlusion of a mural type vein of Galen malformation in a 10-month-old boy with three Woven EndoBridge (WEB 17) and two coils.

We report the case of a 10-month-old boy with an enlarged head circumference and severe motor developmental delay. MRI showed a vein of Galen malformation (VGAM) with a heavily dilated median prosencephalic vein. Digital subtraction angiography confirmed a mural type VGAM with three feeding arteries arising from the posterior cerebral arteries.

Reflective colored image based on metal-dielectric-metal-coated gratings.

Subwavelength gratings coated with metal-dielectric-metal layers and embedded in a dielectric exhibit distinctive color properties in reflectance. The reflected color of incident unpolarized white light can be tuned by the modulation depth of the grating. It is shown that reflective colored images may be reproduced by this type of gratings having a laterally adapted modulation depth.

Two-dimensional subwavelength gratings with different frontside/backside reflectance.

A concept of two-dimensional periodic subwavelength gratings exhibiting different reflectance on the front and back sides is presented. This structure incorporates an arrangement of a metalized hole array and a nanodot array on top. We exemplify the optical properties for an aluminum grating with 243 nm period, and we demonstrate its color filtering properties for unpolarized light in reflectance as well as in transmittance yielding different colors for frontside and backside illumination.