IntroductionPlasmonics plays an important role in modern photonics. Unfortunately, the intrinsic ohmic losses of metals significantly deteriorate the performances of plasmonic systems. In order to alleviate the loss issue, the extensive works have been conducted over the years: the loss compensation by incorporating gain layers into plasmonic systems, the alternative plasmonic materials with low losses, and the special nanostructures exhibiting low losses. Gain‐assisted plasmonic nanostructures composed of lossy metals as building blocks require careful adjustment of gain values, depending on their structures, for compensation of losses. In particular, overcoming metallic losses is of vital importance in spasers and plasmonic lasers.If one has the epsilon‐negative material (the material with negative real part of the dielectric function) with gain or without loss, all these efforts will be unnecessary. The purpose of this work is to find a solution for this problem. In this work, we reveal that the gain composites containing randomly distributed metal nanoparticles behave as lossless and amplifying epsilon‐negative materials under certain conditions. Then, how do these completely mixed metal‐gain composite structures differ from the conventional structures of metal‐gain layers in their plasmonic responses? Due to the composite effect, in gain‐metal random composites the negative real part of the
Physica Status Solidi (B) Basic Solid State Physics – Wiley
Published: Jan 1, 2018
Keywords: ; ; ; ; ;
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