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Title: Coupled Membrane System with Doubly Negative Mass Density and Bulk Modulus
Originating Office: IAS
Speaker: Yang, Zhiyu
Issue Date: 6-Oct-2012
Event Date: 6-Oct-2012
Group/Series/Folder: Record Group 8.15 - Institute for Advanced Study
Series 3 - Audio-visual Materials
Location: 8.15:3 EF
Notes: Host: HKUST Institute for Advanced Study.
Sponsor: The Croucher Foundation.
Croucher Advanced Study Institute on New Materials and New Concepts for Controlling Light and Waves. Talk no.22
Abstract: We present an acoustically doubly negative metamaterial using two coupled membranes. Due to its symmetry, the system can generate both monopolar and dipolar resonances, which are separately tunable in the frequency spectrum. To characterize the material, we developed an eigen-function-based exact homogenization scheme that directly utilizes the experimental displacement fields on the sample’s surfaces to extract the effective mass density and bulk modulus. It is found that double negativity is achieved in a finite frequency regime. Excellent agreement between experiment and theory is seen.
Duration: 15 min.
Appears in Series:8.15:3 - Audio-visual Materials
Videos for Public -- Distinguished Lectures