Complete amplitude and phase control of light using broadband holographic metasurfaces

An X-shaped metasurface is proposed to achieve full, continuous, and broadband control of both the amplitude and phase of visible light.

A New Ground Motion Prediction Equation for Japan Applicable up to M9 Mega-Earthquake

In this study we suggest a new ground motion prediction equation applicable up to the moment magnitude 9 using the strong motion records from the 2011 Tohoku-oki earthquake. We determined a base model with moment magnitude and the shortest distance from the source fault as parameters. In order to avoid overestimating amplitude atmagnitude larger than 8, we examined two models – a quadratic magnitude term and a linear magnitude term with a complete amplitude saturation term at someMw. We then adopt additional correction terms corresponding to amplification by deep sediments or shallow soft soils, and anomalous seismic intensity distribution in order to improve prediction.

STRANGENESS PHOTOPRODUCTION AT ELSA

Photoproduction of hyperons is a promising channel to achieve a complete amplitude analysis. Many observables have been measured and interpreted. The status is discussed here. Recent data obtained with the Crystal Barrel/TAPS setup at ELSA are shown and future plans for hyperon photoproduction are presented.

A SCALING LAW FOR AMPLITUDE-SQUARED SQUEEZING IN KERR EFFECT

We study amplitude-squared squeezing in interaction of coherent light with a nonlinear Kerr medium modelled as an anharmonic oscillator with interaction Hamiltonian H = ½ λ a +2 a 2, where λ is proportional to χ(3) of the nonlinear medium and a is annihilation operator for the interacting field. We find the squeezing parameter S ( τ, r ) in terms of a dimensionless interaction time τ = λ t and Kerr parameter r , which is product of, τ and the average number of photons and obtain almost complete amplitude-squared squeezing (i.e., S ≈ 0) for very small interaction time and very large intensity of the interacting light. We optimize squeezing parameter S ( τ, r ) by an analytic estimation assuming high intensity of the interacting light and realistic values of Kerr nonlinearity following J.Bajer et al. [Czech. J. Phy. 52, 1313 (2002)] and obtain a scaling law for optimal amplitude-squared squeezing with minimum value S min , at r = r min for a given τ. The validity of the scaling law is checked numerically and analytically in the region of realistic values of Kerr nonlinearity and intensity of the interacting light.