We present polarized optical transmission study of uniaxially strained large scale graphene in THz/far-infrared (IR) frequency region. Graphene was supported on stretchable polyethylene substrate and they were elongated up to 20% (ΔL/Lo = 0.2) by applying tensile force. For the IR light polarized along the strain direction (EIR//strain), the optical conductivity σ1(ω) of graphene changes from Drude response into strongly non-Drude-like behavior with a peak formed at finite energy ∼10 meV. In contrast, the coherent Drude conductivity is preserved along the direction perpendicular to the strain (EIRstrain). Possible origin of the strain-induced non-Drude σ1(ω)-behavior is discussed.

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