Thermal emission from a single glass fiber

Kallel, Houssem; Doumouro, Joris; Krachmalnicoff, Valentina; Wilde, Yannick De; Joulain, Karl

doi:10.1016/j.jqsrt.2019.106598

Cited by 5 publications

(5 citation statements)

References 40 publications

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“…To remove any temperature or instrumental dependence, we normalize the measured signal with the response of a blackbody sample at the same temperature, S BB (ω, T *), measured with the same optical path. The normalized signal, S norm (ω) = S sphere (ω, T *)/ S BB (ω, T *), corresponds to the normalized thermal emission of the single sphere, which, by Kirchhoff’s law, is comparable to the absorption cross-section ( C abs ) of the sphere on the gold substrate. ,,, …”

Section: Resultsmentioning

confidence: 99%

“…The normalized signal, S norm (ω) = S sphere (ω, T*)/S BB (ω, T*), corresponds to the normalized thermal emission of the single sphere, which, by Kirchhoff's law, 23 is comparable to the absorption cross-section (C abs ) of the sphere on the gold substrate. 20,21,24,25 This normalization procedure is based on the assumption that the sphere and substrate are thermalized to the hot plate temperature (440 K). Due to the inherently small contact area between the sphere and substrate, 26 we have assessed the possibility of a thermal gradient arising within the sphere as a consequence of conductive cooling through air and the sphere (see Supporting Information, subsection 1.2.2).…”

Section: ■ Results and Discussionmentioning

confidence: 99%

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Transition from Phononic to Geometrical Mie Modes Measured in Single Subwavelength Polar Dielectric Spheres

et al. 2022

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Spherical dielectric resonators are highly attractive for light manipulation, thanks to their intrinsic electric and magnetic resonances. Here, we present measurements of the mid-infrared far-field thermal radiation of single subwavelength dielectric spheres deposited on a gold substrate, of radii ranging from 1 to 2.5 μm, which agree quantitatively with simulated absorption cross sections. For SiO2 microspheres, we evidence the excitation of both surface phonon-polariton (SPhP) modes and geometrical electric and magnetic Mie modes. The transition from a phonon-mode-dominated to a Mie-mode-dominated emission spectrum is observed, with a threshold radius of ∼1.5 μm. We also show that the presence of the metallic substrate augments the computed spheres absorption cross-section due to increased local field enhancement, arising from the near-field interaction of the spheres oscillating charges with their image in the metallic mirror. In contrast, measurements of single subwavelength SPhP-inactive PTFE spheres reveal that the mid-infrared response of such lossy spheres is dominated by their bulk absorption. Our results demonstrate how engineering the geometrical and dielectric properties of subwavelength scatterers can enable the control of thermal emission near room temperature, with exciting perspectives for applications such as radiative cooling.

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Section: Resultsmentioning

confidence: 99%

Section: ■ Results and Discussionmentioning

confidence: 99%

Transition from Phononic to Geometrical Mie Modes Measured in Single Subwavelength Polar Dielectric Spheres

et al. 2022

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“…It has become an important adsorbent in the field of chemistry and an important new, lightweight, and energy-saving composite multifunctional carrier. It can be used for insulation [ 8 ], fire prevention [ 9 , 10 ], heat insulation [ 11 , 12 , 13 ], sound insulation [ 14 , 15 , 16 ], adsorption [ 17 , 18 ], and as a polymer precursor [ 19 , 20 , 21 ]. It is widely used in plastics, rubber, chemicals, aerospace, and other fields.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Modifications, Properties, and Practical Applications of Glass Fiber

Song

et al. 2023

Molecules

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As a new member of the silica-derivative family, modified glass fiber (MGF) has attracted extensive attention because of its excellent properties and potential applications. Surface modification of glass fiber (GF) greatly changes its performance, resulting in a series of changes to its surface structure, wettability, electrical properties, mechanical properties, and stability. This article summarizes the latest research progress in MGF, including the different modification methods, the various properties, and their advanced applications in different fields. Finally, the challenges and possible solutions were provided for future investigations of MGF.

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“…The failure of Planck’s law to describe the thermal emission of subwavelength objects has been reported, for instance, in experiments on the thermalization of an optical fiber thinner than λ Th . In recent years, there has been a renewed effort to develop experimental techniques to measure the thermal emission properties of individual subwavelength objects, with special attention devoted to dielectric structures such as individual antennas. − On the theoretical front, the description of these properties continues to be a challenge. There exists a rigorous theoretical framework known as fluctuational electrodynamics, and different numerical methods have already been developed in this framework to describe the thermal radiation properties of objects of arbitrary size and shape. − However, such a description typically requires solving Maxwell’s equations in complex geometries and involving very different dimensions, such that they are often out of scope of those methods.…”

Section: Introductionmentioning

confidence: 99%

Tunable Thermal Emission of Subwavelength Silica Ribbons

2022

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The thermal properties of individual subwavelength objects, which defy Planck's law, are attracting significant fundamental and applied interest in different research areas. Special attention has been devoted to anisotropic structures made of polar dielectrics featuring thicknesses smaller than both the thermal wavelength and the skin depth. Recently, a novel experimental technique has enabled the measurement of the thermal emissivity of anisotropic SiO 2 nanoribbons (with thicknesses on the order of 100 nm), demonstrating that their emission properties can be largely tuned by adjusting their dimensions. However, despite the great interest aroused by these results, their rigorous theoretical analysis has remained elusive due to the computational challenges arising from the vast difference in the length scales involved in the problem. In this work, we present a systematic theoretical analysis of the thermal emission properties of these dielectric nanoribbons based on simulations within the framework of fluctuational electrodynamics carried out with the boundary element method implemented in the SCUFF-EM code. In agreement with the experiments, we show that the emissivity of these subwavelength structures can be largely tuned and enhanced over the thin-film limit. We elucidate that the peculiar emissivity of these nanoribbons is due to the very anisotropic thermal emission that originates from the phonon polaritons of this material and the properties of the waveguide modes sustained by these dielectric structures. Our work illustrates the rich thermal properties of subwavelength objects, as well as the need for rigorous theoretical methods that are able to unveil the complex thermal emission phenomena emerging in this class of systems.

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Thermal emission from a single glass fiber

Cited by 5 publications

References 40 publications

Transition from Phononic to Geometrical Mie Modes Measured in Single Subwavelength Polar Dielectric Spheres

Transition from Phononic to Geometrical Mie Modes Measured in Single Subwavelength Polar Dielectric Spheres

Recent Progress in Modifications, Properties, and Practical Applications of Glass Fiber

Tunable Thermal Emission of Subwavelength Silica Ribbons

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