Dynamically reconfigurable terahertz metamaterial through photo-doped semiconductor

作者：Chowdhury Dibakar Roy^*; Singh Ranjan; O'Hara John F; Chen Hou Tong; Taylor Antoinette J; Azad Abul K

来源：Applied Physics Letters, 2011, 99(23): 231101.

DOI：10.1063/1.3667197

We demonstrate reconfigurable terahertz metamaterial (MM) in which constituent resonators can be switched from split-ring resonators (SRRs) to closed-ring resonators via optical excitation of silicon islands strategically placed in the split gap. Both the fundamental and the third-order resonance modes experience monotonic damping due to increasing conductive losses in the photo-doped silicon region. More importantly, increasing the optical fluence (>200 mu J/cm(2)) results in the excitation of the second-order resonance mode, which is otherwise forbidden in a split-ring resonator for the incidence polarization in our experiments. Such dynamical control of metamaterial resonances could be implemented in active terahertz devices to achieve additional functionalities.

• 出版日期2011-12-5