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Title: Mechanism of the metallic metamaterials coupled to the gain material

In this study, 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, demonstrating reduction of the resonator damping in all cases and hence the possibility for loss compensation. We find that the differential transmittance ΔT/T can be negative in different SRR configurations, such as SRRs on the top of the gain substrate, gain in the SRR gap and gain covering the SRR structure, while in the fishnet metamaterial with gain ΔT/T is positive.
Authors:
 [1] ;  [2] ;  [3] ;  [4]
  1. Iowa State Univ., Ames, IA (United States); Anhui Univ., Hefei (China)
  2. Institute of Electronic Structure and Laser, Crete (Greece)
  3. Iowa State Univ., Ames, IA (United States)
  4. Iowa State Univ., Ames, IA (United States); Institute of Electronic Structure and Laser, Crete (Greece)
Publication Date:
OSTI Identifier:
1222343
Report Number(s):
IS-J-8545
Journal ID: ISSN 1094-4087; OPEXFF
Grant/Contract Number:
AC02-07CH11358
Type:
Published Article
Journal Name:
Optics Express
Additional Journal Information:
Journal Volume: 22; Journal Issue: 23; Journal ID: ISSN 1094-4087
Publisher:
Optical Society of America (OSA)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; optical properties; metamaterials; resonance; nanophotonics and photonic crystals