Article
Materials Science, Multidisciplinary
Fuwei Yang, Bai Song
Summary: Active control of heat flow is important in thermal management and energy conversion. The study focuses on thermal radiation between twisted bilayer graphene (TBLG), showing that near-field heat flow can vary significantly with twist angle, chemical potential, and temperature. The findings suggest potential for manipulating radiative heat flow through surface plasmons in TBLG.
Article
Thermodynamics
Ming-Qian Yuan, Yong Zhang, Shui-Hua Yang, Hong-Liang Yi
Summary: The study focuses on the near-field radiative heat transfer (NFRHT) between charged metallic plates under an external electric field, showing that copper plates have the largest NFRHT. The p-wave heat flux is greatly amplified by the perpendicular electric field, leading to rapid increase in heat flux between copper plates. The external electric field can be used to control NFRHT, which has various applications in thermal nano-devices.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Optics
Kun Zhang, Bo Zhang, Jinlin Song, Zixue Luo, Qiang Cheng
Summary: In this study, we investigate the near-field radiative heat transfer (NFRHT) between a graphene/SiC core-shell (GSCS) nanoparticle and a hexagonal boron nitride (hBN) plate numerically. By applying a compressive strain to the hBN plate, the hyperbolic modes can be tuned. This allows for the active control of NFRHT by coupling and decoupling the hyperbolic phonon polaritons (HPPs) of hBN and the high-frequency localized surface resonance (LSR) of GSCS nanoparticle. We also predict a thermal rectification ratio of up to 13.6 by combining the effect of the chemical potential of graphene shell on NFRHT. This work enriches the phonon-polariton coupling mechanism and facilitates dynamic thermal management at the nanoscale.
Article
Chemistry, Physical
Yang Liu, Fangqi Chen, Andrew Caratenuto, Yanpei Tian, Xiaojie Liu, Yitong Zhao, Yi Zheng
Summary: This work studies the radiative thermal transport between a pair of metamaterial gratings at the nanoscale. The effective medium theory (EMT) is a traditional method used to calculate the near-field radiative heat transfer (NFRHT) between nanograting structures, but it does not consider the surface pattern effects of nanostructures. In this study, an effective approximation NFRHT method that considers the effects of surface patterns is introduced. Numerical calculations show that this method is more suitable for analyzing the NFRHT between relatively displaced nanogratings compared to the EMT method. It is also demonstrated that the NFRHT between the side faces of gratings greatly affects the NFRHT between a pair of nanogratings.
Article
Materials Science, Multidisciplinary
Jonathan L. Wise, Denis M. Basko
Summary: In this study, the radiative heat current between two thin metallic layers separated by a vacuum gap was analytically calculated using the standard fluctuational electrodynamics framework. The role of dc conductivity of the metals compared to the speed of light in determining the heat current was identified, with different behaviors observed for poorly conducting metals versus well-conducting metals. Evanescent waves and their dominant role in heat current contributions were discussed in relation to the separation distance between the layers and the thermal wavelength.
Article
Thermodynamics
Liliane Basso Barichello, Karine Rui, Rudnei Dias da Cunha
Summary: In this work, the Analytical Discrete Ordinates (ADO) method is applied to solve the discrete ordinates approximation of the two-dimensional radiative transfer equation. By using the nodal technique and the ADO method, this approach can obtain accurate solutions with more refined domain partitions, and comparisons and analysis in the literature reinforce the good performance of this method.
INTERNATIONAL JOURNAL OF THERMAL SCIENCES
(2022)
Article
Physics, Multidisciplinary
Zhuoran Geng, Ilari J. Maasilta
Summary: This work demonstrates that complete tunneling of acoustic waves can occur when leaky surface waves are excited, regardless of the orientations of anisotropic crystals. However, the conditions for achieving complete tunneling have not been explored.
COMMUNICATIONS PHYSICS
(2023)
Article
Physics, Applied
Lindsay P. P. Walter, Mathieu Francoeur
Summary: This study investigates the orientation effects on near-field radiative heat transfer between SiO2 superellipsoid particles. The results show that the conductance can vary up to two times between different orientations. The orientation effects are strongly correlated with the vacuum gap distance between particles. This research is crucial for understanding radiative transport between particles with non-regular geometries.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Applied
Jinlin Song, Lei Chen, Lin Jin, Lei Yao, Humeyra Caglayan, Run Hu
Summary: Near-field radiative heat transfer in many-body systems has great potential for various applications. This study investigates the enhancement and regulation of heat transfer between two monolayer graphene sheets by introducing an hBN plate. It is found that the addition of the hBN plate greatly enhances the heat transfer, and the shift frequency of hBN can be adjusted to achieve remarkable thermal regulation.
APPLIED PHYSICS LETTERS
(2022)
Article
Physics, Multidisciplinary
Gaomin Tang, Lei Zhang, Yong Zhang, Jun Chen, C. T. Chan
Summary: The near-field radiative energy transfer between two separated parallel plates can be controlled by electric current and an in-plane magnetic field, resulting in tunable thermoelectric current generation in graphene. This control is achieved through the interplay between nonreciprocal photon occupation number in graphene and nonreciprocal surface modes in the magneto-optic plate.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
M. Reina, R. Messina, P. Ben-Abdallah
Summary: When two solids at different temperatures are separated by a vacuum gap, they exchange heat through radiation, phonon, or electron tunneling to reach equilibrium. A significant slowing-down of energy exchange is observed in the extreme near-field regime, impacting the temporal evolution of the thermal state of interacting solid systems at nanometric and subnanometric scales.
Article
Chemistry, Multidisciplinary
Shuo Chen, Xiaohu Wu, Ceji Fu
Summary: Phonon polaritons in extremely anisotropic media with ultralow losses and high confinement have provided new possibilities for controlling light at the nanoscale. This study compares the differences in polaritons between 2D and 3D models for biaxial vdW slabs, and reveals the relationship between the difference and the inverse of the dielectric function along different crystal directions.
Article
Thermodynamics
Jihong Zhang, Haotuo Liu, Kaihua Zhang, Jiangcheng Cao, Xiaohu Wu
Summary: This paper investigates the radiative heat transfer between stacked structures consisting of two different hyperbolic materials in both near-field and far-field. The results show that the far-field heat transfer is mainly affected by the substrate material, while the near-field heat transfer is dominated by the hyperbolic film. Additionally, the performance of heat transfer is influenced by the combination of different materials.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Thermodynamics
Baokun Liu, Minggang Luo, Junming Zhao, Linhua Liu, Mauro Antezza
Summary: Near-field radiative heat transfer (NFRHT) has attracted attention due to its intensity beyond the Planck's black-body limit. The insertion of a third object in the proximity of two particles can significantly influence NFRHT. The many-body interaction (MBI) on NFRHT between arbitrary two particles in a system composed of many particles is still not well understood. This study investigates the MBI for different proximate ensembles and provides insights into NFRHT in dense particulate systems.
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
(2023)
Article
Engineering, Chemical
M. Sajedi, A. Safavinejad, M. Atashafrooz
Summary: This paper investigates the entropy generation in combined convection-radiation heat transfer between two parallel isothermal plates filled with a homogeneous and uniform porous medium. The study considers the contributions of fluid friction, conductive heat transfer, and radiative heat transfer to the entropy generation. Different boundary conditions and parameters are examined to analyze their effects on total entropy generation. The results demonstrate the significant impact of radiative heat transfer on entropy generation rates and reveal higher entropy generation numbers for cold walls compared to hot walls.
TRANSPORT IN POROUS MEDIA
(2023)
Article
Astronomy & Astrophysics
Pierre Touboul, Manuel Rodrigues, Gilles Metris, Ratana Chhun, Alain Robert, Quentin Baghi, Emilie Hardy, Joel Berge, Damien Boulanger, Bruno Christophe, Valerio Cipolla, Bernard Foulon, Pierre-Yves Guidotti, Phuong-Anh Huynh, Vincent Lebat, Francoise Liorzou, Benjamin Pouilloux, Pascal Prieur, Serge Reynaud
Summary: The MICROSCOPE mission aimed to test the weak equivalence principle (WEP) with a high precision of 10(-15). By placing masses of different compositions on a circular trajectory around the Earth and measuring their accelerations, the mission aimed to detect potential violations of the WEP. This paper provides a detailed overview of the mission's drivers, major subsystems, and expected error budget.
CLASSICAL AND QUANTUM GRAVITY
(2022)
Article
Materials Science, Multidisciplinary
Anne Nguyen, Jean-Jacques Greffet
Summary: This study analyzes the trade-off between fast modulation and efficiency of nanoscale incandescent sources and compares harmonic modulation and pulse modulation.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Cedric Blanchard, Leo Wojszvzyk, Cecile Jamois, Jean-Louis Leclercq, Celine Chevalier, Lydie Ferrier, Pierre Viktorovitch, Ioana Moldovan-Doyen, Francois Marquier, Jean-Jacques Greffet, Xavier Letartre
Summary: In this study, we introduce thermal metallo-dielectric metasurfaces as sources in the mid-infrared (IR) range. The emitter consists of a lossy metal, and the spectral and angular emission are controlled by a periodic array of high refractive dielectric resonators. We present a design that allows independent control of the emission bandwidth and the angular aperture, while ensuring a large emissivity. To validate the concept, we fabricated and characterized a metasurface, which showed good agreement with the theoretical predictions.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Materials Science, Multidisciplinary
Yuzhe Xiao, Mikhail A. Kats, Jean-Jacques Greffet, Qiang Li, Georgia T. Papadakis
Summary: Thermal radiation refers to the emission of electromagnetic waves from hot objects. The engineering applications of thermal radiation are an active field of research, involving multiple disciplines such as materials science, photonics, and thermal physics.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
V Blondot, C. Arnold, A. Delteil, D. Gerard, A. Bogicevic, T. Pons, N. Lequeux, J. P. Hugonin, J. J. Greffet, S. Buil, J. P. Hermier
Summary: We report the synthesis of hybrid light emitting particles with a diameter ranging from 100 to 500 nm, consisting of a compact CdSe/CdS/CdZnS semiconductor nanocrystal aggregate encapsulated by controlled nanometric size silica and gold layers. The addition of the gold nanoshell enhances the Purcell decay rate, as predicted by numerical simulations. Furthermore, we demonstrate the inhibition of Forster resonance energy transfer contribution.
Article
Optics
Hector Monin, Aurelian Loirette-Pelous, Eva De Leo, Aurelio A. Rossinelli, Ferry Prins, David J. Norris, Elise Baily, Jean-Paul Hugonin, Benjamin Vest, Jean-Jacques Greffet
Summary: We investigate the light emission of a patterned ensemble of colloidal quantum dots (cQDs) through experimental and theoretical study. Compared to a planar layer of cQDs, this system significantly modifies the emission spectrum and polarization. It demonstrates bright, directional, and polarized emission, including circular polarization in certain directions. We propose a light emission model based on a local Kirchhoff law, which accurately reproduces all experimental features. This model provides a quantitative figure of merit for assessing the emitted power. This work facilitates the systematic design of efficient ultrathin light emitting metasurfaces with controlled polarization, spectrum, and directivity.
Article
Optics
Anne Nguyen, Jean-Paul Hugonin, Anne-Lise Coutrot, Enrique Garcia-Caurel, Benjamin Vest, Jean-Jacques Greffet
Summary: This study reports the emission of polarized mid-wave infrared (MWIR) radiation from a 700 nm thick incandescent chiral metasurface. The polarization degree is above 0.5 with a circular polarization degree of 0.38 at 5 μm. The metasurface is heated by the Joule effect and the emission can be modulated beyond 10 MHz. This could enable detection techniques that use polarization as an additional degree of freedom.
Article
Optics
Carina Killian, Zakary Burkley, Philipp Blumer, Paolo Crivelli, Fredrik P. Gustafsson, Otto Hanski, Amit Nanda, Francois Nez, Valery Nesvizhevsky, Serge Reynaud, Katharina Schreiner, Martin Simon, Sergey Vasiliev, Eberhard Widmann, Pauline Yzombard
Summary: At very low energies, light neutral particles can experience quantum reflection above a horizontal surface, leading to gravitational quantum states (GQs). While GQs have been observed with neutrons, this study aims to observe and study GQs of atomic hydrogen, taking advantage of larger fluxes compared to neutrons. Additionally, discrepancies between theoretical calculations and neutron experiments reported by the q-BOUNCE collaboration have sparked further investigations. Preliminary results characterizing a cryogenic hydrogen beam using pulsed laser ionization diagnostics at 243 nm are reported.
EUROPEAN PHYSICAL JOURNAL D
(2023)
Article
Optics
Aurelian Loirette-Pelous, Jean-Jacques Greffet
Summary: In this study, a new theoretical framework is built using established theoretical models and experimental results to explore the phenomena of photon Bose-Einstein condensation and photon thermalisation in semiconductors. The figures of merit for thermalisation and different experimental procedures are discussed. Finally, the fluctuations of the system and their relationship to different regimes are explored.
LASER & PHOTONICS REVIEWS
(2023)
Article
Multidisciplinary Sciences
Laura Paggi, Alice Fabas, Hasnaa El Ouazzani, Jean-Paul Hugonin, Nikos Fayard, Nathalie Bardou, Christophe Dupuis, Jean-Jacques Greffet, Patrick Bouchon
Summary: The authors use low quality resonators to detect molecular absorption spectrum between 5 and 10 μm, resulting in improved system sensitivity.
NATURE COMMUNICATIONS
(2023)
Article
Nanoscience & Nanotechnology
Delphine Pommier, Zeilie Hufschmitt, Cheng Zhang, Yunhe Lai, Geirald Dujardin, Eric Le Moal, Christophe Sauvan, Jean-Jacques Greffet, Jianfang Wang, Elizabeth Boer-Duchemin
Summary: Quantum tunneling-driven optical nanoantennas play a vital role in the development of integrated plasmonic nanodevices. In this study, a tunneling junction between a nanoantenna and a thin gold film is used to electrically excite surface plasmons on the nanoscale. By employing an atomic force microscope, a novel method for completing the electrical circuit between the nanoantenna and the gold film is developed. Numerical modeling identifies the hybridized gap and antenna modes as the major contributors to the excitation of propagating surface plasmon polaritons.
Article
Optics
N. Fayard, I. Ferrier-Barbut, A. Browaeys, J. -J Greffet
Summary: This work proposes a protocol that bypasses the limitation of subradiant states by using a one-dimensional chain of N three-level atoms in a V-shaped configuration. The chain behaves as a time-varying metamaterial, enabling absorption, storage, and on-demand emission in a spectrally and spatially controlled mode. In the nonlinear regime, the transfer of doubly excited states from superradiant to subradiant states is demonstrated, providing a possible route for the optical characterization of their entanglement.
Article
Mathematics, Applied
Serge Reynaud
Summary: This article reviews the cascade of fluorescence photons emitted by a two-level atom excited by coherent laser light. The discussion focuses on the random nature of resonance fluorescence and characterizes the process by analyzing the distribution of delays between successive emitted photons. Other characteristics such as photon counting and photon correlation are also examined.
ADVANCES IN CONTINUOUS AND DISCRETE MODELS
(2023)
Article
Materials Science, Multidisciplinary
Elise Bailly, Kevin Chevrier, Camilo Perez De La Vega, Jean-Paul Hugonin, Yannick De Wilde, Valentina Krachmalnicoff, Benjamin Vest, Jean-Jacques Greffet
Summary: This article presents a technique to obtain the permittivity of fluorophores, such as dye molecules, from fluorescence measurements. The Brendel-Bormann model is found to accurately fit the emission spectra.
OPTICAL MATERIALS EXPRESS
(2022)
Article
Optics
Olivier Rousselle, Pierre Clade, Saida Guellati-Khelifa, Romain Guerout, Serge Reynaud
Summary: In the GBAR experiment, accurately evaluating the gravity acceleration requires considering obstacles surrounding the antimatter source. Monte Carlo simulations and analysis of event statistics near the edges of obstacles provide valuable insights into the accuracy of the evaluation. The specular quantum reflections of antihydrogen on surfaces do not affect the accuracy significantly.
