Achieving volumetric gain metamaterials

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...

Absorption in Metamaterials: Turning Loss into Gain

MIT Student 12 May 2010 ME 2.57: Nano-to-Macro Transport Processes Prof. Chen Absorption in Metamaterials: Turning Loss into Gain INTRODUCTION Nature has often served as inspiration for engineers. The setae of gecko feet are mimicked for climbing robots, the vivid coats of butterflies and peacocks motivate research in structural colors, and the streamline shapes of certain species of fish are i...

Loss-compensated broadband epsilon-near-zero metamaterials with gain media

Mechanism of the metallic metamaterials coupled to the gain material.

We present evidence of strong coupling between the gain material and the metallic metamaterials. It is of vital importance to understand the mechanism of the coupling of metamaterials with the gain medium. Using a four-level gain system, the numerical pump-probe experiments are performed in several configurations (split-ring resonators (SRRs), inverse SRRs and fishnets) of metamaterials, demons...

Gain and plasmon dynamics in active negative-index metamaterials.

Photonic metamaterials allow for a range of exciting applications unattainable with ordinary dielectrics. However, the metallic nature of their meta-atoms may result in increased optical losses. Gain-enhanced metamaterials are a potential solution to this problem, but the conception of realistic, three-dimensional designs is a challenging task. Starting from fundamental electrodynamic and quant...