Electromagnetic energy storage and power dissipation in nanostructures

Zhao, Junming; Zhang, Z.M.

doi:10.1016/j.jqsrt.2014.09.011

Cited by 55 publications

(21 citation statements)

References 36 publications

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“…Conventionally, the absorptance obtained from one minus the reflectance calculated from RCWA is for the whole structure, which includes the graphene and the Ag grating. To separate how much power is indeed absorbed by the graphene only, one can first calculate the power dissipation density [45]:…”

Section: Numerical Modelingmentioning

confidence: 99%

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Resonance enhanced absorption in a graphene monolayer using deep metal gratings

Zhao

Zhang

2015

J. Opt. Soc. Am. B

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It has been demonstrated recently that metal gratings can significantly improve the near-infrared absorptance of graphene from 0.023 to nearly 0.70 because of the excitation of magnetic polaritons (MPs). In the present study, it is shown that the absorptance of graphene can be further enhanced to more than 0.80 by surface plasmon polaritons (SPPs) enabled by the grating. Meanwhile, graphene behaves as a sheet resistor that is able to boost the absorption when MPs or SPPs are excited without changing their resonance frequencies or dispersion relations. The effects of higher-order MPs, as well as the grating geometry on the enhanced absorptance, are also examined. Rigorous coupled-wave analysis (RCWA) is employed to calculate the radiative properties and power dissipation density in both the graphene and the metal grating. This study will facilitate the understanding of the coupling phenomena between graphene and nanostructures and may also benefit the design of next-generation graphenebased optical and optoelectronic devices.

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Section: Numerical Modelingmentioning

confidence: 99%

“…Hence, Eq. (4) can be incorporated into the RCWA algorithm to calculate the local absorption [38,45,46]. The absorptance of graphene can then be obtained from the ratio of the power dissipated inside graphene over the incident power; hence [38],…”

Section: Numerical Modelingmentioning

confidence: 99%

Resonance enhanced absorption in a graphene monolayer using deep metal gratings

Zhao

Zhang

2015

J. Opt. Soc. Am. B

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Section: Energy Storage Systemsmentioning

confidence: 99%

“…Electrochemical capacitors (also called double layer, supercapacitors, or ultracapacitors) have a higher energy density than other capacitors. Some double layer capacitors have a voltage rating at or above 600 V. 27 This makes them suitable for high power quality requirements when storing intermittent and fluctuating renewable energy supplies. Their disadvantages include interdependence of the cells, sensitivity to cell voltage imbalances and maximum voltage thresholds, and safety issues, including electrical, fire, chemical, and explosion hazards.…”

Section: Electromagnetic Energy Storagementioning

confidence: 99%

A comprehensive evaluation of energy storage options for better sustainability

Acar

2018

Int J Energy Res

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Summary Due to ever increasing global energy demand and the limited nature of fossil fuel reserves, there has been tremendous research and development studies in the literature, focusing on alternative and clean energy resources and systems. Renewables are the promising choice when it comes to addressing some critical energy issues such as climate change and energy security. However, renewables have intermittent and discontinuous supplies; hence, they need to be stored in ways that are affordable, reliable, flexible, clean, safe, and efficient. As a result, energy storage is becoming a crucial step to build innovative energy systems for a sustainable future. Energy can be stored in many forms, from electrical to chemical (eg, hydrogen), or electrochemical, thermal, electromagnetic, etc. Each form consists of different technologies, some of which are already commercially mature while others are at early research and development stages. Each of these options can be tailored to meet different end users' needs at different scales. Therefore, this study aims to conduct a comprehensive review on the most recent status of energy storage options, along with the requirements of various end users, and characteristics of smart energy storage systems. The main objective is to summarize the performance evaluation statuses of mechanical, electrochemical, chemical, thermal, and electromagnetic energy storage technologies. The selected performance measures are capacity flexibility, energy arbitrage, system balancing, congestion management, environmental impact, and power quality. In the end, some key recommendations and future directions for energy storage systems are provided.

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“…Examples include coherent thermal emission, wavelength selective or wideband absorbers, etc. [32][33][34][35][36][37]. Extensive reviews of the thermal radiative properties of metamaterials and nanostructured materials can be found in the literature [16,38,39] and will not be discussed further.…”

Section: Introductionmentioning

confidence: 99%

Near-Field Thermal Radiation: Recent Progress and Outlook

Liu

Wang

Zhang

2015

Nanoscale and Microscale Thermophysical Engineering

130

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Any materials at temperatures higher than absolute zero emit electromagnetic waves due to the thermal fluctuations of free charges or ions. When two or more bodies at different temperatures are brought sufficiently close to each other with vacuum gap spacing smaller than the characteristic thermal wavelength, near-field radiative heat flux can exceed the far-field blackbody limit, governed by the well-known Stefan-Boltzmann law, by orders of magnitude. This article reviews the recent progress on both theoretical and experimental studies of near-field thermal radiation with an emphasis on its potential applications. Recent theoretical developments are presented, such as near-field radiation of general anisotropic materials and 2D materials, application condition of effective medium theory, and exact numerical methods for dealing with arbitrary particles or periodic nanostructures. Recent experimental achievements are also discussed, focusing on tip-plane and plane-plane configurations with various materials. The wide applications of near-field radiation are summarized in terms of thermal imaging, energy harvesting, and contactless thermal management such as modulation, rectification, and amplification. An outlook is provided on the promise of near-field thermal radiation in energy harvesting, novel thermal sources, and sensing, as well as the development of related fields such as reducing Casimir stiction, minimizing noise current, and increasing spontaneous emission rate. Challenges are also discussed, such as developing exact and fast computational techniques for complex metamaterials, understanding near-field radiation at extreme gap spacing, overcoming weak mode coupling in thermophotovoltaic (TPV) systems, measuring large-area plane-plane configuration at small gap spacing, and realizing devices based on near-field radiation.

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Electromagnetic energy storage and power dissipation in nanostructures

Cited by 55 publications

References 36 publications

Resonance enhanced absorption in a graphene monolayer using deep metal gratings

Resonance enhanced absorption in a graphene monolayer using deep metal gratings

A comprehensive evaluation of energy storage options for better sustainability

Near-Field Thermal Radiation: Recent Progress and Outlook

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