Plasmon-Enhanced Raman Scattering of WSe2 Monolayer and Brilliant Cresyl Blue Molecules via One-Dimensional Nanogap with Finite-Difference Time-Domain

Taeyoung Moon; Bamadev Das; Huitae Joo; Kyoung-Duck Park

doi:10.5757/ASCT.2023.32.2.45

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Applied Science and Convergence Technology 2023; 32(2): 45-47

Published online March 30, 2023

https://doi.org/10.5757/ASCT.2023.32.2.45

Plasmon-Enhanced Raman Scattering of WSe₂ Monolayer and Brilliant Cresyl Blue Molecules via One-Dimensional Nanogap with Finite-Difference Time-Domain

Taeyoung Moon^a , Bamadev Das^b , Huitae Joo^a , and Kyoung-Duck Park^{a , ∗}

^aDepartment of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea
^bDepartment of Physics and Quantum Photonics Institute, Ulsan National Institute of Science and Technology (UNIST), Ulsan 44919, Republic of Korea

Correspondence to:parklab@postech.ac.kr

Received: March 4, 2023; Revised: March 24, 2023; Accepted: March 27, 2023

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License(http://creativecommons.org/licenses/by-nc/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Abstract

Plasmon-enhanced Raman scattering is crucial for investigating a variety of materials, including chemical and biological molecules. A localized surface plasmon resonance (LSPR) must be designed to strengthen the optical field surrounding the plasmonic structure for sensitive Raman sensing because Raman scattering is proportional to the intensity of the optical field. Recent research has focused on various plasmonic structures, such as nanoparticles on mirrors, nanoparticles, tip-enhanced plasmonic structures, and one-dimensional (1D) nanogaps, to improve Raman scattering by designing LSPR. Furthermore, a 1D nanogap provides an effective optical field enhancement because of the extremely confined optical field and strongly excited LSPR. Moreover, a 1D nanogap enables large-area sensing owing to its one-dimensionally extended nature. In this study, we investigated the strongly enhanced optical field distribution and scattering spectra of a 1D Au nanogap using finite-difference time-domain simulations. In addition, we obtained significantly enhanced Raman scattering signals of a WSe2 monolayer and brilliant cresyl blue molecules via a 1D Au nanogap.

Keywords: Raman scattering, Plasmonic structure, Nanogap, Finite-difference time-domain simulation