We study transport properties of an array created by alternating (a, b) layers with balanced loss/ gain characterized by the key parameter γ. It is shown that for non-equal widths of (a, b) layers, i.e., when the corresponding Hamiltonian is non- -symmetric, the system exhibits the scattering properties similar to those of truly  -symmetric models provided that without loss/ gain the struct...

Parity-time (PT) symmetric periodic structures, near the spontaneous PT-symmetry breaking point, can act as unidirectional invisible media. In this regime, the reflection from one end is diminished while it is enhanced from the other. Furthermore, the transmission coefficient and phase are indistinguishable from those expected in the absence of a grating. The phenomenon is robust even in the pr...

Extending a computation which appeared recently in [1], we compute the transmission and reflection coefficients for massless uncharged scalars and gravitational waves scattered by d ≥ 4 Schwarzschild or d = 4 Reissner-Nordstrøm black holes, in the limit of large imaginary frequencies. The transmission coefficient has an interpretation as the “greybody factor” which determines the spectrum of Ha...

One of the most fundamental difference between classical and quantum mechanics is observed in the particle tunneling through a localized potential: the former predicts a discontinuous transmission coefficient (T) as a function in incident velocity between one (complete penetration) and zero (complete reflection); while in the latter T always changes smoothly with a wave nature. Here we report a...

There are some deficiencies in the traditional daytime visibility calculation method using CCD digital camera: visibility observation value is accurate while using the artificial objects, but expensive; nonzero internal reflection coefficient of the target lead to inaccurate visibility observation results when using natural objects as the target. A new daytime visibility algorithm based on colo...

In this paper, we applied the circuit synthesis theory of filters to design transmission-type metasurface cells and arbitrarily designed amplitude phase transmission reflection by adjusting resonant frequency coupling coefficient. addition, successfully unit cell using conversion filter theory. Moreover, a refractive plate with novel structure that reacts both polarizations. The prototype opera...

GHOSH, RAHUL. Error analysis of Through Reflect Line method for calibrating microwave measurements. (Under the direction of Professor Michael B. Steer) Uncertainty in transmission line based calibration techniques for microwave measurements are studied with the aim of identifying the optimum calibration conditions. Variation in the determined error parameters under certain conditions in Through...