Optical Activity Effect on Planar Chiral Metamaterials
Penulis/Author
Dr. Juliasih Partini, S.Si., M.Si. (1)
Tanggal/Date
22 2019
Kata Kunci/Keyword
Abstrak/Abstract
Metamaterial is an artificial material which has a negative refractive index. Both of
permitivitty and permeability have a negative value to possess negative refraction. The
breakthrough of metamaterial development was present as the invention of planar chiral
metamaterials. This research was focussed on the development of a new design of planar chiral metamaterial with different depth. The developed metamaterial design was analyzed by chirality analysis in relation to the optical activity characteristics.
The planar chiral metamaterial development was following a design, a structure examination,
and a fabrication process using a focused ion beam system. Chirality characterization were
measured using a femtosecond Ti:Sapphire pumped terahertz emission spectroscopy system.
THz signal was occurred due to the optical rectification process as a result of an intense
femtosecond laser pulses radiation on planar chiral metamaterial sample. The samples were
capable to generate a THz emission over a frequency range of 2.24 THz, while the THz
signal was measured as 5 ps. The effect of optical activity was able to rotate the polarization
plane on a frequency range of 0 – 1.4 THz for both of the clockwise and the counter-clockwise
samples. The maximum polarization plane rotation were +13 and 18 at a frequency 1.35 THz. It can be concluded that the new design planar chiral metamaterial with different depth has been successfully obtained with its elliptic polarized THz emission characteristic.
