Open Access
Subscription Access
Emergence of Chirality from Extreme Anisotropy
Abstract
ABSTRACT
Metamaterials allow for the engineering of customized responses to electromagnetic radiation. In particular, epsilon-near-zero (ENZ) and epsilon-near-pole (ENP) metamaterials have been designed. Thin monolayers of extremely anisotropic metamaterials, ENZ-ENP meta-surfaces, formed by metal nanowires, can exhibit polarization conversion over distances of just 30 nm. This is achieved through difference in phase accumulation for fields polarized along ENZ and ENP directions. When Fabry-Perot resonances corresponding to ENZ and ENP cross, polarization rotation is obtained. This study is based on a chiral metamaterial composed of stacked ENZ-ENP meta-surfaces, each rotated with respect to the other. It is found that the spectrum of the rotated structure is similar to the spectrum of the structure without rotation, with the exception that instead of crossings, the ENZ and ENP modes feature anti-crossings, which signify their coupling and formation of a novel type of hybrid chiral resonance. These resonances determine the spectroscopic properties of the resulting chiral structure.
Keywords: Chiral structure, metamaterials, nanowire
Cite this Article: Iffat R. Arisa. Emergence of Chirality from Extreme Anisotropy. International Journal of Optical Sciences. 2019; 5(1): 1–4p.
Metamaterials allow for the engineering of customized responses to electromagnetic radiation. In particular, epsilon-near-zero (ENZ) and epsilon-near-pole (ENP) metamaterials have been designed. Thin monolayers of extremely anisotropic metamaterials, ENZ-ENP meta-surfaces, formed by metal nanowires, can exhibit polarization conversion over distances of just 30 nm. This is achieved through difference in phase accumulation for fields polarized along ENZ and ENP directions. When Fabry-Perot resonances corresponding to ENZ and ENP cross, polarization rotation is obtained. This study is based on a chiral metamaterial composed of stacked ENZ-ENP meta-surfaces, each rotated with respect to the other. It is found that the spectrum of the rotated structure is similar to the spectrum of the structure without rotation, with the exception that instead of crossings, the ENZ and ENP modes feature anti-crossings, which signify their coupling and formation of a novel type of hybrid chiral resonance. These resonances determine the spectroscopic properties of the resulting chiral structure.
Keywords: Chiral structure, metamaterials, nanowire
Cite this Article: Iffat R. Arisa. Emergence of Chirality from Extreme Anisotropy. International Journal of Optical Sciences. 2019; 5(1): 1–4p.
References
Kildishev AV, Boltasseva A, Shalaev Planar photonics with meta surfaces, VM. Science. 2013; 339 (6125).
Yu N, Capasso F., Flat optics with designer metasurfaces, Nat. Mater. 2014;13(2): 139–150p.
Zhao Y, Liu XX, Alu A., Recent advances on optical metasurfaces J. Opt. 2014;16(12): 123001p.
Jiang ZH, Lin DL, Ma S. Yun, Werner DH, Liu Z, Mayer TS. Broadband and Wide Field-of-view Plasmonic Meta surface - enabled Waveplates, Scientific Report 4. Article number: 7511,2014.
Keene D, Durach M., Hyperbolic resonances of meta surface cavities, Opt. Exp. 2015;23(14): 18577–18588.
Refbacks
- There are currently no refbacks.