Phase gradient metagratings (PGMs) have provided unprecedented opportunities for wavefront manipulation. However, this approach suffers from fundamental limits on conversion efficiency; in some cases, higher order diffraction caused by the periodicity can be observed distinctly, while the working mechanism still is not fully understood, especially in refractive-type metagratings. Here we show, analytically and experimentally, a refractive-type metagrating which can enable anomalous reflection and refraction with almost unity efficiency over a wide incident range. A simple physical picture is presented to reveal the underlying diffraction mechanism. Interestingly, it is found that the anomalous transmission and reflection through higher order diffraction can be completely reversed by changing the integer parity of the PGM design, and such phenomenon is very robust. Two refractive acoustic metagratings are designed and fabricated based on this principle and the experimental results verify the theory.

High-sensitivity X-ray detectors made of solution grown CsPbBr ₃ single crystals with high crystalline quality was reported in this work. The device with asymmetric electrodes configuration shows high sensitivity of 1256 μC Gy ⁻¹ cm ⁻² .

Artificial topological charge designed by azimuthal metagratings can be used to control sound vortex diffraction.