A two-dimensional dielectric metamaterial composed of a TiO2 cube array is fabricated, and its performance is characterized in the terahertz region. The effective electromagnetic parameters are retrieved from the complex transmission and reflection coefficients of the sample, obtained using terahertz time-domain spectroscopy. The retrieved parameters show negative permeability and permittivity at around 0.28 and 0.38 THz, respectively. We also show via simulations that negative refractive index metamaterials can be realized by combining two sets of TiO2 cubes of appropriate sizes. We also propose and fabricate composite structures made of TiO2 spheres and a metal mesh to obtain a negative refractive index. The observed transmission band is attributed to the negative refractive index. TiO2 is a promising material for fabricating negative refractive index metamaterials for the terahertz frequency region.
|Number of pages||8|
|Journal||IEEE Transactions on Terahertz Science and Technology|
|Publication status||Published - 2013 Nov|
- Dielectric spheres
- negative refractive index
ASJC Scopus subject areas
- Electrical and Electronic Engineering