The impact of nearest neighbor interaction on the resonances in terahertz metamaterials

By using terahertz time-domain spectroscopy and rigorous simulations, we investigate the impact of gap orientation of neighboring split rings on the three lowest order eigenmodes for a metamaterial based on split ring resonators. We distinct scenarios where neighboring split rings have their gap either on the same or on opposite sides. The two lowest order eigenmodes are marginally affected, whereas the higher order eigenmode experiences a significant spectral reshaping. By modifying the period it is shown that due to a coherent interaction a huge resonance sharpening is observed. Hence potential application can be anticipated by using such materials, e.g., in sensing devices.

[1]  Willie J Padilla,et al.  Terahertz Magnetic Response from Artificial Materials , 2004, Science.

[2]  Weili Zhang,et al.  Effect of metal permittivity on resonant properties of terahertz metamaterials. , 2008, Optics letters.

[3]  G. von Plessen,et al.  Radiation damping in metal nanoparticle pairs. , 2007, Nano letters.

[4]  Carsten Rockstuhl,et al.  On the reinterpretation of resonances in split-ring-resonators at normal incidence. , 2006, Optics express.

[5]  J. Pendry,et al.  Magnetism from conductors and enhanced nonlinear phenomena , 1999 .

[6]  R. Shelby,et al.  Experimental Verification of a Negative Index of Refraction , 2001, Science.

[7]  D. Grischkowsky,et al.  Far-infrared time-domain spectroscopy with terahertz beams of dielectrics and semiconductors , 1990 .

[8]  J. Lourtioz,et al.  Engineering resonances in infrared metamaterials. , 2008, Optics express.

[9]  Lifeng Li,et al.  New formulation of the Fourier modal method for crossed surface-relief gratings , 1997 .

[10]  Harald Giessen,et al.  Magnetoinductive and Electroinductive Coupling in Plasmonic Metamaterial Molecules , 2008 .

[11]  Y. Kivshar,et al.  Suppression of left-handed properties in disordered metamaterials , 2004, physics/0411208.

[12]  J. Cooper,et al.  Nanophotonic split-ring resonators as dichroics for molecular spectroscopy , 2008 .

[13]  Carsten Rockstuhl,et al.  The origin of magnetic polarizability in metamaterials at optical frequencies - an electrodynamic approach. , 2007, Optics express.