Purayil, D. N., Nandakumar, N., Modak, S., Pitchappa, P., & Kumar, A. (2026). Role of structural asymmetry in tailoring electromagnetically induced transparency and figure of merit in terahertz metamaterials. Journal of Applied Physics, 139(10). https://doi.org/10.1063/5.0315524
Abstract:
Electromagnetically induced transparency (EIT) in metamaterials, a classical analog of quantum EIT, exhibits a sharp transparency window with steep dispersion, enabling applications such as sensing and slow-light devices. Although EIT has been widely demonstrated, systematic investigations into tuning and optimizing the response through structural parameters remain limited. In this work, we present a terahertz metamaterial composed of a double split-ring resonator unit cell, where EIT is tuned by varying the structural asymmetry (α). We evaluate the figure of merit of EIT using two approaches. The first approach considers the product of the quality factor and transmission intensity, while the second is based on the product of the group delay and transmission intensity. Both methods identify intermediate values of α as optimal for achieving a strong and spectrally selective EIT response. This study demonstrates the effectiveness of structural asymmetry in tuning the EIT characteristics and provides insights into the design of adaptable terahertz photonic devices.
License type:
Attribution 4.0 International (CC BY 4.0)
Funding Info:
This research / project is supported by the Anusandhan National Research Foundation (ANRF) - Prime Minister Early Career Research Grant
Grant Reference no. : ANRF/ECRG/2024/001205/PMS
This research / project is supported by the DST - INSPIRE Fellowship
Grant Reference no. : NA
This research / project is supported by the A*STAR - Manufacturing, Trade, and Connectivity Programmatic Fund
Grant Reference no. : M22L1b0110
Description:
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Purayil, D. N., Nandakumar, N., Modak, S., Pitchappa, P., & Kumar, A. (2026). Role of structural asymmetry in tailoring electromagnetically induced transparency and figure of merit in terahertz metamaterials. Journal of Applied Physics, 139(10) and may be found at https://doi.org/10.1063/5.0315524