Variation in refractive index near the surfaces of glass melts

Microstrip Antenna Gain Enhancement using Near Zero Refractive Index Metamaterials

Some useful features of microstrip patch antennas are low profile, low weight and easy fabrication. However this type of antenna suffers from having a low gain, caused by propagation surface waves. In this paper, a new near zero refractive index metamaterial (MTM) unit cell is designed and fabricated as a superstrate over a Rectangular Microstrip Patch Antennas (RMPA). In order to obtain a maxi...

Near - zero refractive index photonics

The control and manipulation of light on the nanoscale — the primary aim of nanophotonics — is of fundamental scientific interest and plays a key role in telecommunication technologies and energy management. Yet, because light–matter interactions are usually weak and hard to confine, they often need to be assisted by the use of suitably designed macroscopic media. For instance, the use of caref...

Refractive Index Determinations of Glass Fragments

Synoptic Variation of the Radio Refractive Index*

The synoptic variation of the atmospheric radio refractive index, evaluated from standard weather observations, is examin ed d uri ng an ou t break of polar continental air. It is found t hat t he reduced-t o-sea-Ieve1 value of t he r efractive index is a more sensitive synoptic parameter t han t he station value. The reduced valu e is quite sensit ive to the humidity and density structure of t...

Variation of corneal refractive index with hydration.

We report the effect of changes in the corneal hydration on the refractive index of the cornea. Using optical coherence tomography (OCT), the geometrical thickness and the group refractive index of the bovine cornea were derived simultaneously as the corneal hydration was varied. The corneal hydration was then calculated from the corneal thickness. The group refractive index of the cornea incre...