Journal ArticleDOI
Study of magnetic polaritons in deep gratings for thermal emission control
Bo Zhao,Zhuomin M. Zhang +1 more
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TLDR
In this paper, the authors investigated the fundamental mechanism of optical resonance in deep gratings by considering the excitation of magnetic polaritons (MPs) and showed that when the kinetic inductance is large, the maximum resonance wavelength can be more than twice that predicted by the cavity mode.Abstract:
Recently, it has been shown that convex cavities or 2D grating structures can enhance thermal emission for energy conversion systems. The mechanisms, however, cannot be well explained by either the conventional cavity resonance modes or surface plasmon polaritons. The present study elucidates the fundamental mechanism by considering the excitation of magnetic polaritons (MPs) in deep gratings. Rigorous coupled-wave analysis (RCWA) is employed to calculate the radiative properties by solving Maxwell's equations numerically. The LC-circuit model is employed to predict the resonance conditions. The current and field distributions further confirm the excitation of magnetic resonances. It is shown that MPs and cavity modes agree with each other when the kinetic inductance is negligibly small. However, when the kinetic inductance is sufficiently large, the maximum resonance wavelength can be more than twice that predicted by the cavity mode. Furthermore, different materials are considered and the frequency range is extended from the near-infrared to the microwave region to illustrate the scalability of the MPs. This study clarifies one of the underlying mechanisms of optical resonance in deep gratings and will benefit the design of wavelength-selective thermal emitters.read more
Citations
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Journal ArticleDOI
Near-field radiative thermal transport: From theory to experiment
TL;DR: In this paper, the authors summarize the basics of fluctuational electrodynamics, a theoretical framework for the study of radiative heat transfer in terms of thermally excited propagating and evanescent electromagnetic waves.
Journal ArticleDOI
Enhancement of near-infrared absorption in graphene with metal gratings
TL;DR: In this paper, the authors demonstrate that the absorptance in a monatomic graphene layer can be greatly enhanced to nearly 70%, thanks to the localized strong electric field resulting from magnetic resonances in deep metal gratings.
Journal ArticleDOI
Strong Plasmonic Coupling between Graphene Ribbon Array and Metal Gratings
Bo Zhao,Zhuomin M. Zhang +1 more
TL;DR: In this paper, a hybrid plasmonic system composed of an array of graphene ribbons over a periodic metal grating is theoretically investigated, and it is shown that localized resonances, that is, magnetic polaritons, in metal gratings can couple with the plasmoric resonance in graphene ribbons, resulting in significantly enhanced absorption in graphene.
Journal ArticleDOI
Parallel LC circuit model for multi-band absorption and preliminary design of radiative cooling
TL;DR: A parallel inductance and capacitance PLC circuit model is proposed to explain and predict the multi-band resonant absorption peaks of exciting magnetic polaritons in the infrared region and this omnidirectional and polarization insensitive structure is a good candidate for radiative cooling application.
Journal ArticleDOI
Resonance enhanced absorption in a graphene monolayer using deep metal gratings
TL;DR: In this paper, it was shown that the absorptance of graphene can be further enhanced to more than 0.80 by surface plasmon polaritons (SPPs) enabled by the grating.
References
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Book
Handbook of Optical Constants of Solids
TL;DR: In this paper, E.D. Palik and R.R. Potter, Basic Parameters for Measuring Optical Properties, and W.W.Hunter, Measurement of Optical Constants in the Vacuum Ultraviolet Spectral Region.
Book
Radiative heat transfer
TL;DR: In this article, the Monte Carlo method for thermal radiation was used to estimate the radiative properties of one-dimensional Gray Media, and the method of Spherical Harmonics (PN-Approximation) was used for the same purpose.
Journal ArticleDOI
Surface plasmon enhanced silicon solar cells
TL;DR: Pillai and Catchpole this article acknowledge the UNSW Faculty of Engineering Research Scholarship and the support of an Australian Research Council fellowship, which they used to support their work in this article.
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Nanoimprint Lithography: Methods and Material Requirements**
TL;DR: In this paper, the basic principles of nano-printing are discussed, with an emphasis on the requirements on materials for the imprinting mold, surface properties, and resist materials for successful and reliable nanostructure replication.
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Circuits with Light at Nanoscales: Optical Nanocircuits Inspired by Metamaterials
TL;DR: It is shown that the concept of metamaterial-inspired nanoelectronics (“metactronics”) can bring the tools and mathematical machinery of the circuit theory into optics, may link the fields of optics, electronics, plasmonics, and meetamaterials, and may provide road maps to future innovations in nanoscale optical devices, components, and more intricate nanoscales metammaterials.