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Metamaterial with Simultaneously Negative Bulk Modulus and Mass Density

by: Yiqun Ding, Zhengyou Liu, Chunyin Qiu, Jing Shi
Physical Review Letters, Vol. 99, No. 9. (2007)

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We report a metamaterial which simultaneously possesses a negative bulk modulus and mass density. This metamaterial is a zinc blende structure consisting of one fcc array of bubble-contained-water spheres (BWSs) and another relatively shifted fcc array of rubber-coated-gold spheres (RGSs) in epoxy matrix. The negative bulk modulus and mass density are simultaneously derived from the coexistent monopolar resonances from the embedded BWSs and dipolar resonances from the embedded RGSs. The Poisson ratio of the metamaterial also turns negative near the resonance frequency.


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