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Search: WFRF:(Ma Yungui) > (2013)

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  • Ma, Yungui, et al. (author)
  • A transient thermal cloak experimentally realized through a rescaled diffusion equation with anisotropic thermal diffusivity
  • 2013
  • In: NPG Asia Materials. - : Springer Science and Business Media LLC. - 1884-4049 .- 1884-4057. ; 5:11, s. e73-
  • Journal article (peer-reviewed)abstract
    • Transformation optics has made a major contribution to the advancement of modern electromagnetism and related research assisted by the development of metamaterials. In this work, we applied this concept to the thermodynamics using the coordinate transformation to the time-dependent heat diffusion equation to manipulate the heat flux by predefined diffusion paths. Experimentally, we demonstrated a transient thermal cloaking device engineered with effective thermal materials and successfully hid a centimeter-sized vacuum cavity. A rescaled heat equation accounting for all the pertinent parameters of various ingredient materials was proposed to greatly facilitate the fabrication. Our results unambiguously demonstrate the practical possibility of implementing complex transformed thermal media with high accuracy and acquiring several unprecedented thermodynamic functions, which we believe will help to broaden the current research and pave a new path to manipulate heat for novel device applications.
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2.
  • Ma, Yungui, et al. (author)
  • First experimental demonstration of an isotropic electromagnetic cloak with strict conformal mapping
  • 2013
  • In: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 3, s. 2182-
  • Journal article (peer-reviewed)abstract
    • In the past years quasi-conformal mapping has been generally used to design broadband electromagnetic cloaks. However, this technique has some inherit practical limitations such as the lateral beam shift, rendering the device visible or difficult to hide a large object. In this work we circumvent these issues by using strict conformal mapping to build the first isotropic cloak. Microwave near-field measurement shows that our device (with dielectric constant larger than unity everywhere) has a very good cloaking performance and a broad frequency response. The present dielectric approach could be technically extended to the fabrication of other conformal devices at higher frequencies.
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  • Result 1-2 of 2
Type of publication
journal article (2)
Type of content
peer-reviewed (2)
Author/Editor
He, Sailing (2)
Jiang, Wei (2)
Ma, Yungui (2)
Lan, Lu (2)
Sun, Fei (1)
Liu, Yichao (1)
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Ong, C. K. (1)
Wu, Tiantian (1)
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University
Royal Institute of Technology (2)
Language
English (2)
Year
2013 (2)Undo refine

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