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Optics Express

Optics Express

  • Editor: Andrew M. Weiner
  • Vol. 22, Iss. 7 — Apr. 7, 2014
  • pp: 8473–8489

Towards loss compensated and lasing terahertz metamaterials based on optically pumped graphene

P. Weis, J. L. Garcia-Pomar, and M. Rahm  »View Author Affiliations

Optics Express, Vol. 22, Issue 7, pp. 8473-8489 (2014)

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We evidence by numerical calculations that optically pumped graphene is suitable for compensating inherent loss in terahertz (THz) metamaterials. We calculate the complex conductivity of graphene under optical pumping and determine the proper conditions for terahertz amplification in single layer graphene. It is shown that amplification in graphene occurs up to room temperature for moderate pump intensities at telecommunication wavelength λ = 1.5 μm. Furthermore, we investigate the coupling between a plasmonic split ring resonator (SRR) metamaterial and optically pumped graphene at a temperature T = 77 K and a pump intensity I = 300 mW/mm2. We find that the loss of a SRR metamaterial can be compensated by optically stimulated amplification in graphene. Moreover, we show that a hybrid material consisting of asymmetric split-ring resonators and optically pumped graphene can emit coherent THz radiation at minimum output power levels of 60 nW/mm2.

© 2014 Optical Society of America

OCIS Codes
(140.3380) Lasers and laser optics : Laser materials
(140.3410) Lasers and laser optics : Laser resonators
(160.3918) Materials : Metamaterials
(300.6495) Spectroscopy : Spectroscopy, teraherz

ToC Category:
Terahertz Optics

Original Manuscript: January 2, 2014
Revised Manuscript: March 11, 2014
Manuscript Accepted: March 11, 2014
Published: April 2, 2014

P. Weis, J. L. Garcia-Pomar, and M. Rahm, "Towards loss compensated and lasing terahertz metamaterials based on optically pumped graphene," Opt. Express 22, 8473-8489 (2014)

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