Grating on Plasmonic Nanosheet Structure for Multi-Stopband Filtering and Narrowband Emission
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Grating on Plasmonic Nanosheet Structure for Multi-Stopband Filtering and Narrowband Emission Jayachandra Bingi 1 Received: 27 December 2019 / Accepted: 26 March 2020 # Springer Science+Business Media, LLC, part of Springer Nature 2020Abstract
The narrowband emission at microscale regime is a crucial technology need in view of nanophotonic networks and lab-on-achip applications. Considering the significance of plasmonic nanosheet, this work proposes one such narrowband emitter in microscale regime. The proposed system is a dielectric grating on plasmonic nanosheet hybrid system. The numerical simulation results show that the proposed structure works as multi-stopband filter with band tenability as a function of refractive index of grating material. Furthermore, spectral smoothening is demonstrated due to the integration of dielectric grating to plasmonic nanosheet. Infiltration of the emitter in the grooves of the dielectric grating results in the narrowband-enhanced emission in UV region. The emission band proved to be tuned by carefully engineering the surface roughness, and can be engineered the same into broadband emitter. This new structure shows the way for realizing the on-chip spectrofluoremeter concept. Keywords Plasmonic nanosheet . Stopband filter . Narrowband emitter . Emission engineering
Introduction Plasmonic nanosheets are the wide area structures with nanoscale thickness. These structures show different properties compared with the 1D structures and also offer ease of fabrication in nanophotonic circuits. As plasmon effects are surfacial, the wide area or the 2D plasmons are useful for nanocavity and laser applications [1–3]. The literature shows that most of the work on plasmonic nanosheets is focused on bringing the plasmonic behavior in dielectric nanosheet by incorporating metal nanoparticles. In this direction, GeSe nanosheet is coated on the Au layer that has enhanced the refractive index sensitivity by 80% [4]. Incorporating the Ag nanoparticles into Pd nanosheet significantly increased the NIR absorption and photothermal upconversion [5]. Pd/Ag nanosheet demonstrated for its hydrogen sensing, electrolysis, and Ag@SiO2 nanocubes on FeTiO2 nanosheet is proposed for pesticide detection [6–9]. Furthermore, MoO3 nanosheet exhibited tunable plasmonic responses for charge storage applications [10]. Hence, plasmonic noble metal nanosheets are mostly unexplored as 2D structures, which will have direct applications in nanophotonic circuits.
On the other hand, similar structures such as dielectricembedded Au grating, multicomponent multilayer aperiodic structures, and layered ZnS:Ge structure with Au coating are demonstrated to exhibit terahertz emission, narrowband thermal emission, and mid-infrared thermal emitter, respectively [11–13]. These structures/works indicate the possibility of engineering the emission bands in plasmonic structures with integrated grating patterns. The potential of plasmonic nanosheet (as 2D structures) and plasmonic-dielectric grating combination shows the possibility a
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