Thermal radiation in systems of many dipoles

Tervo, Eric J.; Francoeur, Mathieu; Cola, Baratunde A.; Zhang, Zhuomin

doi:10.1103/physrevb.100.205422

Cited by 51 publications

(19 citation statements)

References 62 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Furthermore, the RCWA results show that the physical origin of the emissivity increase of our cooler is also due to the spherical geometry of the SiO 2 beads (see details in the Supporting Information). In agreement with other studies, our model reveals no significant improvement of the emissivity with increasing the number of colloidal layers . We further corroborate these results by FT‐IR measurements, shown in Section SC3 in the Supporting Information.…”

supporting

confidence: 92%

A Self‐Assembled 2D Thermofunctional Material for Radiative Cooling

Jaramillo‐Fernandez

Whitworth

Pariente

et al. 2019

Small

106

View full text Add to dashboard Cite

All modern cooling technologies are overwhelmingly energyconsuming. Air conditioners and refrigerators together account for almost a quarter of the total electricity used in the United States. [1] Thus, it is not surprising that the latest International Energy Agency report [2] identifies cooling as one of the main The regulation of temperature is a major energy-consuming process of humankind. Today, around 15% of the global-energy consumption is dedicated to refrigeration and this figure is predicted to triple by 2050, thus linking global warming and cooling needs in a worrying negative feedbackloop. Here, an inexpensive solution is proposed to this challenge based on a single layer of silica microspheres self-assembled on a soda-lime glass. This 2D crystal acts as a visibly translucent thermal-blackbody for above-ambient radiative cooling and can be used to improve the thermal performance of devices that undergo critical heating during operation. The temperature of a silicon wafer is found to be 14 K lower during daytime when covered with the thermal emitter, reaching an average temperature difference of 19 K when the structure is backed with a silver layer. In comparison, the soda-lime glass reference used in the measurements lowers the temperature of the silicon by just 5 K. The cooling power of this simple radiative cooler under direct sunlight is found to be 350 W m −2 when applied to hot surfaces with relative temperatures of 50 K above the ambient. This is crucial to radiatively cool down devices, i.e., solar cells, where an increase in temperature has drastic effects on performance. www.advancedsciencenews.com

show abstract

supporting

confidence: 92%

A Self‐Assembled 2D Thermofunctional Material for Radiative Cooling

Jaramillo‐Fernandez

Whitworth

Pariente

et al. 2019

Small

106

View full text Add to dashboard Cite

show abstract

“…In addition, the effects of the coupling between the two gratings, breaking of symmetry, and collective many-body interaction on NFRHT between the two nanoparticle gratings are fully taken into account by the many-body radiative heat transfer theory. [39][40][41][42][43][44] We focus on the radiative thermal conductance GðhÞ between two polar dielectric SiC nanoparticle gratings with a relative angle h, which is the sum of that between all possible nanoparticle pairs (one from the grating L and the other one from grating U) and is defined as follows: 45…”

mentioning

confidence: 99%

Near-field radiative heat transfer between twisted nanoparticle gratings

Luo

Zhao

Antezza

2020

Applied Physics Letters

View full text Add to dashboard Cite

We study the near-field radiative heat transfer between two twisted finite-size polar dielectric nanoparticle gratings. Different from previous studies of the same configuration, we do not rely on any approximated effective medium theory to describe the gratings. By the full many-body radiative heat transfer theory, we are able to investigate how the size, distance, and relative orientation between the gratings influence the radiative heat flux. By changing the twisting angle h, we show a significant oscillation of the thermal conductance GðhÞ, due to the size effect for gratings of both square and circular shapes. The distance-and twisting-dependent coupling between the gratings accounts for a strong and characteristic modulation of radiative thermal conductance with implications for the energy management, sensing, and the micro-electromechanical system (MEMS) and nano-electromechanical system (NEMS) devices.

show abstract

“…Then, a similar heat superdiffusion was found in the periodically arranged planar SiC plates [41]. Recently, a new method was developed to calculate the diffusive radiative thermal conductivity of arbitrary collections of nanoparticles [42], which is an important progress relative to the kinetic method used to calculate the effective radiative thermal conductivity of 1D nanoparticle chain [43][44][45]. Also, the radiative thermal energy (RTE) emitted in the near field by a set of interacting nanoparticles has been the object of investigations, and has been recently predicted to focus the field in spots that are much smaller than those obtained with a single thermal source [46].…”

Section: Introductionmentioning

confidence: 72%

Radiative heat transfer and radiative thermal energy for two-dimensional nanoparticle ensembles

et al. 2020

View full text Add to dashboard Cite

Radiative heat transfer (RHT) and radiative thermal energy (RTE) for two-dimensional (2D) nanoparticle ensembles are investigated in the framework of many-body radiative heat transfer theory. We consider nanoparticles made of different materials: metals (Ag), polar dielectrics (SiC), or insulator-metallic phase-change materials (VO 2 ). We start by investigating the RHT between two parallel 2D finite-size square-lattice nanoparticle ensembles, with particular attention to many-body interactions (MBI) effects. We fix the particle radius (a) as the smallest length scale, and we describe the electromagnetic scattering from particles within the dipole approximation. Depending on the minimal distance between the in-plane particles (the lattice spacing p for periodic systems), on the separation d between the two lattice and on the thermal wavelength λ T =hc/k B T , we systematically analyze the different physical regimes characterizing the RHT. Four regimes are identified, rarefied regime, dense regime, non-MBI regime, and MBI regime, respectively. When p λ T , a multiple scattering of the electromagnetic field inside the systems gives rise to a MBI regime. MBI effects manifest themselves in different ways, depending on the separation d: (a) If d > λ T , due to the pure intra-ensemble MBI inside each 2D ensemble, the total heat conductance is less affected, and the thermal conductance spectrum manifests a single peak which is nonetheless shifted with respect to the one typical of two isolated nanoparticles. (b) If d < λ T , there is a strong simultaneous intra-ensemble and inter-ensemble MBI. In this regime there is a direct quantitative effect on the heat conductance, in addition to a qualitative effect on the thermal conductance spectrum, which now manifests a new second peak. As for the RTE, to correctly describe the radiation emitted by metallic nanoparticles, we derive an expression of the Poynting vector including also magnetic contribution, in addition to the electric one. By analyzing both periodic and nonperiodic ensembles, we show that the RTE emitted by a single 2D nanoparticle ensemble is sensitive to the particle distribution. As instance, we see that the RTE emitted by 2D concentric-ring-configuration ensemble has an inhibition feature near the center of the ensemble.

show abstract

Thermal radiation in systems of many dipoles

Cited by 51 publications

References 62 publications

A Self‐Assembled 2D Thermofunctional Material for Radiative Cooling

A Self‐Assembled 2D Thermofunctional Material for Radiative Cooling

Near-field radiative heat transfer between twisted nanoparticle gratings

Radiative heat transfer and radiative thermal energy for two-dimensional nanoparticle ensembles

Contact Info

Product

Resources

About