Note on Anomalous Refraction

Another look at anomalous refraction on

Radiometric Correction of Anomalous Refraction

We propose a scheme to measure and correct anomalous refraction effects for millimeter wave antennas. A radiometer tuned to the 183 GHz atmospheric water vapor line scans the atmosphere above the aperture of an antenna to determine the spatial derivative of the refractive index. In an array of antennas, such as the MMA, it would be used simultaneously to measure the phase delay correction for t...

A Note on “Anomalous” Chiral Gauge Theories

We show that, the lattice regularization of chiral gauge theories proposed by Kaplan, when applied to a (2+1)-dimensional domain wall, produces a (1+1)-dimensional theory at low energy even if gauge anomaly produced by chiral fermions does not cancel. But the corresponding statement is not true in higher dimensions. Chiral gauge theories deserve deeper study because nature exhibits left-right a...

Terahertz metamaterials for linear polarization conversion and anomalous refraction.

Polarization is one of the basic properties of electromagnetic waves conveying valuable information in signal transmission and sensitive measurements. Conventional methods for advanced polarization control impose demanding requirements on material properties and attain only limited performance. We demonstrated ultrathin, broadband, and highly efficient metamaterial-based terahertz polarization ...

Anomalous index of refraction in photonic bandgap materials

Near the gap in a photonic bandgap material the effective index of refraction can become less than unity and in fact can approach zero at the band edge itself-leading to ultra-refractive optical effects . We illustrate this effect quantitatively in a simple one-dimensional Kronig-Penney model of a threedimensional bandgap structure . As a complement to index-enhancing schemes involving lasing w...