We experimentally demonstrate polarization-controlled multifrequency coherent perfect absorption in stereometamaterials with twisted asymmetrically split rings. The coupling effects in stereometamaterials lead to the mode hybridization and thus multiple electric and magnetic resonances. The coherent perfect absorptions of electric and magnetic modes in stereometamaterials have been verified to be individually switched on/off by an interferometric effect of two counter-propagating coherent beams. The alternation of two orthogonal polarization states enables direct modulation of the operation frequencies of coherent perfect absorptions in both microwave and optical metamaterials. The work provides an opportunity to manipulate coherent perfect absorption and is helpful to design tunable multifrequency absorbers.

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After the devastating earthquake, the earthquake emergency personnel need to get the detailed geographical information of the epicentral position in the first time, including the location of the epicenter, the administrative division of the earthquake area, the traffic, the population, the economy, the terrain, the active fault distribution, the historical earthquake and many more. The traditional approach is presented in the form of data from the Earthquake Response Base database and the production of thematic maps (two-dimensional floor plans), but it cannot describe and express the elevation of the ground and the height of the ground. Based on this, emergency rescue decision-makers on the location of the epicenter of the spatial cognitive constraints, affecting decision-makers on the field of information to determine, and thus affect the efficiency of earthquake emergency rescue work. Based on the three-dimensional symbols of seismic emergency, this paper summarizes the technical process of 3D emergency map of seismic emergency based on GIS, and realizes the threedimensional display of seismic emergency information on two-dimensional medium, Hoping to provide more realistic and more accurate mapping services for earthquake emergency rescue decision makers.