Design and Analysis of a THz Metamaterial Structure with High Refractive Index at Two Frequencies

Autor:	Naz E. Islam, Zan Lu, Bruno Camps-Raga
Rok vydání:	2012
Předmět:	Materials science Article Subject business.industry High-refractive-index polymer Terahertz radiation Frequency band Physics::Optics General Physics and Astronomy Metamaterial Dielectric Optics Return loss Dual frequency business Refractive index
Zdroj:	Physics Research International. 2012:1-9
ISSN:	2090-2239 2090-2220
DOI:	10.1155/2012/206879
Popis:	The concept of a single frequency band, single high-refractive-index metamaterial has been extended and applied in the design of dual frequency band, dual high-refractive-index metamaterials in the THz regime. The structure design consists of twenty five unit cells with a surface area of 250 um by 250 um and a thickness of 5 um. Each cell has metallic structures embedded in a polyimide substrate. The return loss (S-parameter) analysis shows two strong electric responses at two frequency ranges, and the extracted constitutive parameters suggested high values of simultaneous dielectric constant and permeability at these frequencies. Results retrieved from the S-parameters also show high refractive index values. A first peak refractive index of 61.83 was observed at a resonant frequency of 0.384 THz, and another peak refractive index of 19.2 was observed at the resonant frequency 1.416 THz. Analysis show that higher refractive index at the second resonance frequency band is achievable through redesign of the structures, and modifications could lead to a single structure with multiple frequency, multiple high-refractive-index metamaterials that can be put to practical use.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::361eac959d83c2dcb8f405eb57474325 https://doi.org/10.1155/2012/206879 Zobrazit plný text záznamu Plný text ve formátu PDF