Regensburg 2013 – scientific programme

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O: Fachverband Oberflächenphysik

O 43: Plasmonics and Nanooptics IV

O 43.9: Talk

Wednesday, March 13, 2013, 12:30–12:45, H31

Broadband subwavelength imaging using a tunable graphene-ens — •Peining Li and Thomas Taubner — RWTH Aachen University, Sommerfeldstraße 14, 52074 Aachen, Germany

Graphene as a one-atom-thick planar sheet can support surface plasmons at infrared (IR) and terahertz (THz) frequencies, opening up exciting possibilities for the emerging research field of graphene plasmonics. Here, we theoretically report that a layered graphene-lens (GL) enables the enhancement of evanescent waves for near-field subdiffractive imaging [1]. Compared to other resonant imaging devices like superlenses [2,3], the nonresonant operation of the GL provides the advantages of a broad intrinsic bandwidth and a low sensitivity to losses, while still maintaining a good subwavelength resolution of better than λ/10. Most importantly, thanks to the large tunability of the graphene, we show that our GL is a continuously frequency-tunable subwavelength-imaging device in the IR and THz regions, thus allowing for ultrabroadband spectral applications.

[1] P. Li, T. Taubner, ACS Nano, In press.

[2] J. B. Pendry, Phys. Rev. Lett., 85, 3966-3969, (2000).

[3] T. Taubner et. al., Science, 313, 1595-1595, (2006).