Terahertz metasurfaces with high Q-factors

We propose asymmetric D-split resonators as unit cells for high Q metasurfaces. In such resonators, current trapped modes lead to in-phase oscillations of antisymmetric currents. Thus, radiation losses are suppressed, enabling Q-factors beyond the ones obtainable in symmetric designs. We compare the proposed structure against both asymmetric and symmetric split ring metasurfaces and find an improvement in terms of Q by a factor of two and ten, respectively. Transmission measurements in a terahertz spectrometer provide experimental proof of the high Q-factors and agree well with numerical simulations. In the future, asymmetric D-split metasurfaces could be employed as high-performance sensors or filters.

[1]  Abul K. Azad,et al.  Experimental demonstration of frequency-agile terahertz metamaterials , 2008 .

[2]  Wai Lam Chan,et al.  A spatial light modulator for terahertz beams , 2009 .

[3]  M. Kafesaki,et al.  Electric coupling to the magnetic resonance of split ring resonators , 2004 .

[4]  P. Nordlander,et al.  The Fano resonance in plasmonic nanostructures and metamaterials. , 2010, Nature materials.

[5]  S. L. Prosvirnin,et al.  Coherent meta-materials and the lasing spaser , 2008, 0802.2519.

[6]  Martin Koch,et al.  Asymmetric planar terahertz metamaterials. , 2010, Optics express.

[7]  Xomalin G. Peralta,et al.  Large-area metamaterials on thin membranes for multilayer and curved applications at terahertz and higher frequencies , 2009 .

[8]  Jihong Shi,et al.  Modelling and Analysis of Ω-shaped Double Negative Material-assisted Microwave Sensor , 2009 .

[9]  Igal Brener,et al.  Thin-film sensing with planar terahertz metamaterials: sensitivity and limitations. , 2008, Optics express.

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

[11]  D. Mittleman.  Sensing with terahertz radiation , 2003 .

[12]  N I Zheludev,et al.  Sharp trapped-mode resonances in planar metamaterials with a broken structural symmetry. , 2007, Physical review letters.

[13]  D P Tsai,et al.  Spectral collapse in ensembles of metamolecules. , 2009, Physical review letters.

[14]  Sher-Yi Chiam,et al.  Controlling metamaterial resonances via dielectric and aspect ratio effects , 2010 .

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

[16]  Martin Koch,et al.  High Q-factor metasurfaces based on miniaturized asymmetric single split resonators , 2009 .

[17]  Hyunhee Lee,et al.  Polarization angle control of coherent coupling in metamaterial superlattice for closed mode excitation. , 2010, Optics express.

[18]  Martin Koch,et al.  Thin-film sensing with planar asymmetric metamaterial resonators , 2008 .

[19]  Carsten Rockstuhl,et al.  Cryogenic temperatures as a path toward high-Q terahertz metamaterials , 2010 .

[20]  I. Al-Naib,et al.  Applying the Babinet principle to asymmetric resonators , 2008 .

[21]  Basudev Lahiri,et al.  Asymmetric split ring resonators for optical sensing of organic materials. , 2009, Optics express.

[22]  T. Dekorsy,et al.  Rapid and precise read-out of terahertz sensor by high-speed asynchronous optical sampling , 2009 .