When impinging on optical structures or passing in their vicinity, free electrons can
spontaneously emit electromagnetic radiation, a phenomenon generally known as …

TiO2 metasurfaces have been intensively studied in the past few years. To date, the TiO2
metadevices only used their high reflective index (n). The controllable light extinction …

Flat optical components based on metasurfaces will appear in our daily life in the near
future. Our discussion focuses on metasurface-based components consisting of sub …

Bending light along arbitrary curvatures is a captivating and popular notion, triggering
unprecedented endeavors in achieving diffraction-free propagation along a curved path in …

The recently proposed concept of graphene photodetectors offers remarkable properties
such as unprecedented compactness, ultrabroadband detection, and an ultrafast response …

Cherenkov radiation occurs only when a charged particle moves with a velocity exceeding
the phase velocity of light in that matter. This radiation mechanism creates directional light …

Nonlinear phononics relies on the resonant optical excitation of infrared-active lattice
vibrations to induce targeted structural deformations in solids. This form of dynamical crystal …

Analyzing the complex structures and functions of brain is the key issue to understanding the
physiological and pathological processes. Although neuronal morphology and local …

Although a plethora of techniques are now available for controlling the group velocity of an
optical wave packet, there are very few options for creating accelerating or decelerating …

We design and demonstrate what we called shape-preserving “optical pin beams”(OPBs)
that possess stable wavefronts against diffraction and ambient turbulence during free-space …