Beams with helical phasefronts described by exp(ilphi) carry an orbital angular momentum equivalent to lh per photon. Using diffractive optics this helical phase structure can be applied to every spectral component of the beam such that a spatially coherent white-light beam can carry orbital angular momentum without any chromatic distortion. This achromatic property can be hard to achieve in sp...

The orbital angular momentum (OAM) of the structure light is viewed as a candidate for enhancing capacity information processing. Microring has advantages in realizing compact lasers required on-chip applications. However, clockwise and counterclockwise whispering gallery modes (WGM) appear simultaneously, emitted from normal microring does not possess net OAM. Here, we propose an OAM laser bas...

The detection of weak and rare effects in large amounts data arises a number modern analysis problems. Known results show that this situation the potential statistical inference is severely limited by large-scale multiple testing inherent these Here, we fundamentally more powerful possible when there some structure signal can be exploited, for example, if clustered many small blocks, as case re...