From Event: SPIE Commercial + Scientific Sensing and Imaging, 2018
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.
Goutam Rana, Prathmesh Deshmukh, S. P. Duttagupta, S. S. Prabhu, Venu Gopal Achanta, and G. S. Agarwal, "Quadrupolar interactions to achieve high Q plasmon induced transparency," Proc. SPIE 10657, Next-Generation Spectroscopic Technologies XI, 106570Z (Presented at SPIE Commercial + Scientific Sensing and Imaging: April 18, 2018; Published: 14 May 2018); https://doi.org/10.1117/12.2304508.
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