Rounding corners of nano-square patches for multispectral plasmonic metamaterial absorbers
OSA - The Optical Society
11763 - 11770
Item Usage Stats
Multispectral metamaterial absorbers based on metal-insulatormetal nano-square patch resonators are studied here. For a geometry consisting of perfectly nano-square patches and vertical sidewalls, double resonances in the visible regime are observed due to simultaneous excitation of electric and magnetic plasmon modes. Although slightly modifying the sizes of the square patches makes the resonance wavelengths simply shift, rounding corners of the square patches results in emergence of a third resonance due to excitation of the circular cavity modes. Sidewall angle of the patches are also observed to affect the absorption spectra significantly. Peak absorption values for the triple resonance structures are strongly affected as the sidewall angle varies from 90 to 50 degrees. Rounded corners and slanted sidewalls are typical imperfections for lithographically fabricated metamaterial structures. The presented results suggest that imperfections caused during fabrication of the top nanostructures must be taken into account when designing metamaterial absorbers. Furthermore, it is shown that these fabrication imperfections can be exploited for improving resonance properties and bandwidths of metamaterials for various potential applications such as solar energy harvesting, thermal emitters, surface enhanced spectroscopies and photodetection. © 2015 Optical Society of America.
Surface enhanced spectroscopy
Published Version (Please cite this version)https://doi.org/10.1364/OE.23.011763
Showing items related by title, author, creator and subject.
How to design and characterize metal-dielectric based metamaterials: experimental demonstrations of metamaterial applications at the millimeter-wave regime Alıcı, Kamil Boratay; Özbay, Ekmel (OSA, 2008-10)In the present work, after detailed explanation of the metamaterials design methods, we demonstrate two different double negative metamaterial media and their properties in terms of radiation and negative refaraction at ...
Retrieval of effective parameters for bianisotropic metamaterials with omega shaped metallic inclusions Li, Z.; Aydin, K.; Özbay, Ekmel (Elsevier, 2011-11-18)Bianisotropic metamaterials including Ω-shaped metallic elements are investigated experimentally and theoretically. A passband is observed for a composite metamaterial (CMM) based on an Ω-medium below the plasmonic frequency ...
Investigation of metamaterial coated conducting cylinders for achieving transparency and maximizing radar cross section Ircı, Erdinç; Ertürk, Vakur B. (IEEE, 2007)Recently, reducing the radar cross sections (RCS) of various structures to achieve transparency and obtaining resonant structures aimed at increasing the electromagnetic intensities, stored or radiated power levels have ...