Resonance tuning effect using nanoparticle cluster configuration in the infrared regime
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RESEARCH ARTICLE
Resonance tuning effect using nanoparticle cluster configuration in the infrared regime Manh Cuong Tran1 • Van Hai Pham1 • Dac Tuyen Le2 • Dinh Lam Vu3 Huy Hoang Luc1
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Received: 20 February 2019 / Accepted: 13 July 2020 Ó The Optical Society of India 2020
Abstract In this report, we investigated numerically the clusters of Silica Nitrid (Si3N4) nanoparticles of different configurations. By calculating the transmission spectra of light that impinges on the structure, the clusters show different responses to the electromagnetic wave. Resonant dips and peaks were analyzed based on electromagnetic scattering and the equivalent circuit model of the structure. We show that by alternating the configuration of the clusters, the resonance dips and peaks of structure can be adjusted to the desired value. This tunability of field resonance nanocluster may give rise to a variety of interesting applications for nonlinear or plasmonic sensor devices. Keywords Nanoparticle cluster Fano resonance Transmission Sensor
Introduction Researches on nanoscale structures have shown their importance in recent decades [1–6], especially due to their unique optical properties. Resonances appearing on the structure are usually due to surface plasmon resonance and electromagnetic oscillations of the particles [4, 7, 8],
& Manh Cuong Tran [email protected]; [email protected] 1
Faculty of Physics, Hanoi National University of Education, 136 Xuan Thuy, Cau Giay, Hanoi, Vietnam
2
Department of Physics, Hanoi University of Mining and Geology, 18 Pho Vien, Bac Tu Liem, Hanoi, Vietnam
3
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Hanoi, Vietnam
occurring when the incoming wave reaches the surface of the structure. These resonance properties also depend on the grain morphology and the different configurations [9–13]. Derived from silicon nitride nanoparticle structures, the process of combining these monomers in our computational study [9], clusters of 3, 4 and 5 particle clusters can be generated systematically with properly interaction potential energy. In this study, we separate these three configuration structures and focus on resonant characteristics with an excitation wave. Our calculated results, base on FDTD (finite-difference time-domain) method show that, with different structures, the resonance characteristics are different, the transmission spectrum of the structure shows that the resonance dip shifts when the configuration of the cluster changes. The asymmetry of the structure also influenced their resonance characteristics. To further investigate this characteristic, the 4-particle nanocluster is studied by both symmetric and asymmetric configurations. The results show that the resonance frequency shifts by breaking the symmetry of 4-particle nanocluster, and these shifts then are interpreted by observing the distribution fields and using an equivalent circuit model. Observing the focus and distribution of the electric field on the 4-pa
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