Asymmetric planar terahertz metamaterials.

We report an experimental observation of three distinct resonances in split ring resonators (SRRs) for both vertical and horizontal electric field polarizations at normal incidence by use of terahertz time-domain spectroscopy. Breaking the symmetry in SRRs by gradually displacing the capacitive gap from the centre towards the corner of the ring allows for an 85% modulation of the fundamental inductive-capacitive resonance. Increasing asymmetry leads to the evolution of an otherwise inaccessible high quality factor electric quadrupole resonance that can be exploited for bio-sensing applications in the terahertz region.

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

[2]  Dennis G. Hall,et al.  Enhanced Dipole-Dipole Interaction between Elementary Radiators Near a Surface , 1998 .

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

[4]  C. Soukoulis,et al.  Numerical studies of left-handed materials and arrays of split ring resonators. , 2001, Physical review. E, Statistical, nonlinear, and soft matter physics.

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

[6]  M. Wegener,et al.  Magnetic Response of Metamaterials at 100 Terahertz , 2004, Science.

[7]  H. Moser,et al.  Terahertz response of a microfabricated rod-split-ring-resonator electromagnetic metamaterial. , 2005, Physical review letters.

[8]  Weili Zhang,et al.  Transmission properties of terahertz pulses through subwavelength double split-ring resonators. , 2006, Optics letters.

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

[10]  Willie J Padilla,et al.  Active terahertz metamaterial devices , 2006, Nature.

[11]  Willie J Padilla,et al.  Dynamical electric and magnetic metamaterial response at terahertz frequencies , 2006, 2006 Conference on Lasers and Electro-Optics and 2006 Quantum Electronics and Laser Science Conference.

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

[13]  Christian Debus,et al.  Frequency selective surfaces for high sensitivity terahertz sensing , 2007, 2104.05462.

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

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

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

[17]  Willie J Padilla,et al.  A metamaterial absorber for the terahertz regime: design, fabrication and characterization. , 2008, Optics express.

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

[19]  Harald Giessen,et al.  Three-dimensional photonic metamaterials at optical frequencies. , 2008, Nature materials.

[20]  Remigius Zengerle,et al.  Negative index bulk metamaterial at terahertz frequencies. , 2008, Optics express.

[21]  Weili Zhang,et al.  Optically thin terahertz metamaterials. , 2008, Optics express.

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

[23]  H. Giessen,et al.  Three-dimensional metamaterials at optical frequencies , 2008, 2008 Conference on Lasers and Electro-Optics and 2008 Conference on Quantum Electronics and Laser Science.

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

[25]  Hu Tao,et al.  Reconfigurable terahertz metamaterials. , 2009, Physical review letters.

[26]  F. Lederer,et al.  Analogue of electromagnetically induced transparency in a terahertz metamaterial , 2009, 0907.1937.

[27]  Jan G. Korvink,et al.  Terahertz metamaterials fabricated by inkjet printing , 2009 .

[28]  F. Lederer,et al.  Coupling between a dark and a bright eigenmode in a terahertz metamaterial , 2009, 0901.0365.

[29]  Jianqiang Gu,et al.  Increased frequency shifts in high aspect ratio terahertz split ring resonators , 2009 .

[30]  Carsten Rockstuhl,et al.  The impact of nearest neighbor interaction on the resonances in terahertz metamaterials , 2009 .

[31]  Willie J Padilla,et al.  A metamaterial solid-state terahertz phase modulator , 2009 .