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Proceedings Paper

Quadrupolar interactions to achieve high Q plasmon induced transparency
Author(s): Goutam Rana; Prathmesh Deshmukh; S. P. Duttagupta; S. S. Prabhu; Venu Gopal Achanta; G. S. Agarwal
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Paper Abstract

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.

Paper Details

Date Published: 14 May 2018
PDF: 6 pages
Proc. SPIE 10657, Next-Generation Spectroscopic Technologies XI, 106570Z (14 May 2018); doi: 10.1117/12.2304508
Show Author Affiliations
Goutam Rana, Indian Institute of Technology Bombay (India)
Prathmesh Deshmukh, Indian Institute of Technology Bombay (India)
S. P. Duttagupta, Indian Institute of Technology Bombay (India)
Tata Institute of Fundamental Research (India)
S. S. Prabhu, Tata Institute of Fundamental Research (India)
Venu Gopal Achanta, Tata Institute of Fundamental Research (India)
G. S. Agarwal, Texas A&M Univ. (United States)

Published in SPIE Proceedings Vol. 10657:
Next-Generation Spectroscopic Technologies XI
Mark A. Druy; Richard A. Crocombe; Steven M. Barnett; Luisa T.M. Profeta; Abul K. Azad, Editor(s)

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