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Dipole induced quadrupole resonance leads to transmission peak within the broad dipole absorption as shown in plasmonic metamaterials. We show quadrupolar interactions as a new paradigm to control this classical analogue of electromagnetically induced transparency (i.e. plasmon induced transparency, PIT) in metamaterials. While the asymmetry factor of the resultant Fano line shape of a EIT spectrum limits the quality factor (Q) of the resonance and thus the sensing application, we show that quadrupolar interactions give a handle on the Q factor. A Q as high as 600 is seen in simulations at about 0.977 THz. Limited by the experimental resolution, a Q of about 100 is observed. Further plasmonic structures can be designed to make use of the quadrupolar interactions for high sensitive devices at THz frequencies.
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Goutam Rana, Prathmesh Deshmukh, S. P. Duttagupta, S. S. Prabhu, Venu Gopal Achanta, G. S. Agarwal, "Quadrupolar interactions to achieve high Q plasmon induced transparency," Proc. SPIE 10657, Next-Generation Spectroscopic Technologies XI, 106570Z (14 May 2018); https://doi.org/10.1117/12.2304508