Tunable plasmon-induced transparency based on graphene metasurface structure for mid-infrared sensing applications

IF 2.4 4区物理与天体物理 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Current Applied Physics Pub Date : 2025-02-22 DOI:10.1016/j.cap.2025.02.009

Tae-Han Kim, Sang Woo Kim, Bo Wha Lee

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Abstract

The plasmon-induced transparency (PIT) effect in graphene metasurface (MS) structures is investigated through numerical and theoretical analysis in the mid-infrared range. The unit cell of the MS consists of two vertical and one horizontal graphene strip. By adjusting the Fermi energy, a blue shift in the PIT window occurs, while changes in the surrounding medium's refractive index cause a red shift, enabling tunable PIT control without altering the structure. Theoretical models using coupled Lorentz oscillators show good agreement with the simulation results, revealing a slow-light effect through increased group delay. Sensitivity, Q-factor, and figure of merit (FOM) show that sensitivity ranges from 7.0 to 11 THz/RIU as the refractive index changes, and FOM reaches around 180 with stable Q-factor at 15. This work provides a physical understanding of the tunable PIT effect in graphene MS structures and suggests potential applications in sensing, selective filtering, and advanced refractive index-based detection.

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来源期刊

Current Applied Physics 物理-材料科学：综合

CiteScore

4.80

自引率

0.00%

发文量

213

审稿时长

33 days

期刊介绍： Current Applied Physics (Curr. Appl. Phys.) is a monthly published international journal covering all the fields of applied science investigating the physics of the advanced materials for future applications. Other areas covered: Experimental and theoretical aspects of advanced materials and devices dealing with synthesis or structural chemistry, physical and electronic properties, photonics, engineering applications, and uniquely pertinent measurement or analytical techniques. Current Applied Physics, published since 2001, covers physics, chemistry and materials science, including bio-materials, with their engineering aspects. It is a truly interdisciplinary journal opening a forum for scientists of all related fields, a unique point of the journal discriminating it from other worldwide and/or Pacific Rim applied physics journals. Regular research papers, letters and review articles with contents meeting the scope of the journal will be considered for publication after peer review. The Journal is owned by the Korean Physical Society.