THESIS
2012
4, 3-55 p. : ill. ; 30 cm
Abstract
Metamaterials are artificially designed and fabricated materials which derive novel properties from structures on the sub-wavelength scale. Two dimensional (planar) chirality and three dimensional (bulk) chirality are two important electromagnetic properties of chiral metamaterials. Motivated by some potential applications such as giving rise to negative refractive index, the research on chiral metamaterials is developing fast in recent years....[
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Metamaterials are artificially designed and fabricated materials which derive novel properties from structures on the sub-wavelength scale. Two dimensional (planar) chirality and three dimensional (bulk) chirality are two important electromagnetic properties of chiral metamaterials. Motivated by some potential applications such as giving rise to negative refractive index, the research on chiral metamaterials is developing fast in recent years.
In this thesis, circular dichroisms have been carefully studied. Theoretically, with the help of the Jones matrix method, two kinds of circular dichroisms, circular conversional dichroism and circular conversion dichroism, have been distinguished; experimentally, I have fabricated saw tooth structure metamaterials on indium tin oxide (ITO) coated glass, and cover the sample with another ITO coated glass to eliminate the asymmetric transmission. As a result, the circular conventional dichroism and the circular conversional dichroism could be distinguished. What is more, considering the requirements in application, a series of control variable experiments have been done to study the effects of the metamaterials' thickness, pattern stripe width and lattice type on circular dichroisms.
Our experiments prove that the circular conversion dichroism do exist in saw tooth metamaterials, for both of the uncovered (3D asymmetric) and sandwiched (3D symmetric) samples. The control variable study also paves the way for fabricating metamaterials with high transmission and large circular dichroisms, these results might benefit the applications of metamaterials.
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