A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts ...

A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), with broad impacts ...

Refractive index - the ratio of the speed of electromagnetic radiation in a medium to its speed in a vacuum - can be modulated fast enough to generate photonic time crystals (PTCs) in the near-visible ...

Physicists at Harvard University in the US have built a silicon waveguide that exhibits a refractive index of, or close to, zero when operating at near-infrared telecom wavelengths. The waveguide can ...

PORTLAND, Ore. — Silicon circuits traditionally don't do optics. As an “indirect bandgap” material — one in which the bottom of the conduction band is shifted with respect to the top of the valence ...

(Nanowerk News) A multi-institutional research collaboration has created a novel approach for fabricating three-dimensional micro-optics through the shape-defined formation of porous silicon (PSi), ...

PTCs, materials in which refractive index rises and falls rapidly in time, are the temporal equivalent of photonic crystals in which the refractive index oscillates periodically in space causing, for ...

ABSTRACT Astronomical optics may encounter a wide range of nighttime temperatures (∼−10°C to +20°C) at mountaintop observatories. Complex refractive optics used in high‐performance spectrographs and ...