Year: 2010
Type: article
Abstract: We fabricated an acoustic composite structure consisting of a periodic array of interspaced membranes and side holes. Experimental data on the transmission, effective density, and phase velocity are presented. The system exhibits two critical frequencies, ${\ensuremath{\omega}}_{\mathrm{SH}}$ and ${\ensuremath{\omega}}_{c}$. Our metamaterial is double negative and transparent for frequencies lower than ${\ensuremath{\omega}}_{\mathrm{SH}}$. For the frequencies ${\ensuremath{\omega}}_{\mathrm{SH}}<\ensuremath{\omega}<{\ensuremath{\omega}}_{c}$, the medium is opaque and only the density is negative. For the frequencies above ${\ensuremath{\omega}}_{c}$, the system is double positive and transparent. The present medium exhibits a very wide double negative spectral range that opens the possibility of the application of metamaterials for ``white lights.''
Source: Physical Review Letters
Language: English
Subfield: Acoustics and Ultrasonics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W1825026030