Enhancing plasmonic effect in periodic nanometal square prisms with fences and cavities for refractive index and tempera
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RESEARCH PAPER
Enhancing plasmonic effect in periodic nanometal square prisms with fences and cavities for refractive index and temperature sensing applications Chung-Ting Chou Chao & Yuan-Fong Chou Chau Hai-Pang Chiang
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Received: 18 February 2020 / Accepted: 15 September 2020 # Springer Nature B.V. 2020
Abstract This paper investigates the enhancing plasmonic effect of periodic arrays of silver-shell square prisms employing a three-dimensional finite element method for refractive index and temperature sensing applications in the near-infrared region. We found that the connected metal-shell square prisms could simultaneously generate surface, gap, and cavity plasmon resonances modes in a single structure and remarkably enhance the sensing performance. The proposed design, constructed using silver-shell square prisms with linked fences, as a plasmon resonance source in the center of the unit cell, can sense refractive index and temperature with outstanding sensitivity as 940 nm/RIU and 0.5 nm/ °C, respectively. Simulation results reveal that the proposed structure’s absorptance is approximately perfect, significantly larger than its concrete counterpart without the center cavity and linked fences. The proposed system has a strong dipolar effect generated from the mutual inductance on metal and coupled fences, and the
Yuan-Fong Chou Chau and Hai-Pang Chiang are contributed equally C.
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