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• W829354515 abstract "Near field thermal radiation is the enhancement of thermal radiation by photon tunnelling when the separation gap between the emitting and the receiving object is below the wavelength of thermal radiation. This is caused by evanescent waves on the surface of the object, by surface plasmon polaritons and by surface phonon polaritons. In recent years researchers have modelled and experimentally measured near field thermal radiation. The near field radiative heat transfer between two objects of materials supporting surface phonon polaritons is a strong function of the separation gap. Below 1 um the slope of the distance-heat ow curve is d^-a, where a depends on the geometry of both objects. The goal of this thesis was to determine if near field thermal radiation can be used as a measurement signal to determine the size of the separation gap between two objects. Using the principles of fluctuational electrodynamics models were made to calculate the near field radiative heat flow between various materials (dielectrics, metals, semiconductors and magnetic materials). For curved objects the proximity approximation is used to calculate radiative heat flows. It was discovered that the amount of near field heat radiation between two objects strongly depends on the types of material involved. The heat transfer between two SiO2 plates is expected to be over 1000 times as high as the black body radiation limit in submicron gaps. The heat transfer between an SiO2 plate and a gold plate remains well below the black body radiation limit for the same separation gap. An experimental setup was designed and build to demonstrate that near field thermal radiation can be used to measure the gap between two objects made of a material supporting surface phonon polaritons. Because of its thermal sensitivity silicon nitride cantilevers with a layer of gold on them were used as thermal sensors, a glass microsphere glued on the free end of the cantilever provides the surface phonon polariton supporting material. The substrate used was a glass microscope slide. The experiments where the setup was placed in air confirmed that the setup is sensitive to heat flows between the sphere and the substrate, in atmospheric conditions this heat flow is dominated by gas conduction, in vacuum this is dominated by near field thermal radiation. These experiments also revealed that the setup is sensitive to drift, likely to be caused by temperature changes in the environment. When the experiment was done in vacuum the results were inconclusive, the contact point between the sphere and the substrate could not be determined and therefore it is not known where the size of the separation gap is zero. More measurements are needed to confirm whether or not near field thermal radiation can be used to measure distances between objects." @default.
• W829354515 created "2016-06-24" @default.
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• W829354515 date "2015-06-25" @default.
• W829354515 modified "2023-09-23" @default.
• W829354515 title "Near field thermal radiation distance sensing" @default.
• W829354515 hasPublicationYear "2015" @default.
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