Designing integrated photonics, especially to leverage Kerr-nonlinear optics, requires accurate and precise knowledge of refractive index across the visible infrared spectral ranges. Tantala (Ta_2O_5) is an emerging material platform for photonics nanophotonics that offers broadband ultralow loss, moderately high nonlinearity, advantages scalable heterogeneous integration. We present refractive...

Wake patterns due to a uniformly traveling source are result of the resonant emission medium's collective excitations. When there exists frequency range where such excitations possess negative group velocity, their interference leads wake pattern resembling Kelvin ship wake: while "transverse" and "divergent" wavefronts trailing source, they oriented oppositely Kelvin's. This is illustrated by ...

background: beta-thalassemia major is a severe and lethal hemolytic anemia. regular transfusion is necessary for avoidance of its complications but it may end to cardiac involvement secondary to iron overload. angiotensin converting enzyme inhibitors (aceis) are useful medications even in early stages of heart failure. we studied the effects of two common aceis on improvement of heart function ...