Journal ArticleDOI
Broadband optical circular polarizers in the terahertz region using helical metamaterials
Reads0
Chats0
TLDR
In this paper, a broadband helical circular polarizer in the terahertz region using helical metamaterials was proposed and the finite difference time domain method was used to design the structure and perform the simulation.Abstract:
We propose a broadband circular polarizer in the terahertz region using helical metamaterials. The finite difference time domain method was used to design the structure and perform the simulation. By properly selecting the parameters of helical metamaterials, including the radius of wires, number of helix-periods, spacing of grids, length of helix-period, and radius of helix, we obtained a broadband helical circular polarizer in the terahertz region that can achieve an extinction ratio above 20:1 in the wavelength range from 66 to 105 µm.read more
Citations
More filters
Journal ArticleDOI
Spirulina-templated Metal Microcoils With Controlled Helical Structures for THz Electromagnetic Responses
Kaori Kamata,Zhenzi Piao,Soichiro Suzuki,Takahiro Fujimori,Wataru Tajiri,Keiji Nagai,Tomokazu Iyoda,Atsushi Yamada,Toshiaki Hayakawa,Mitsuteru Ishiwara,Satoshi Horaguchi,Amha Belay,Takuo Tanaka,Keisuke Takano,Masanori Hangyo +14 more
TL;DR: This work describes the biotemplating process onto Spirulina surface to fabricate metal microcoils, one of remarkable features in nature beyond current processing technology such as lithography in terms of mass-productivity and structural multiplicity.
Journal ArticleDOI
High negative refractive index in chiral metamaterials
TL;DR: In this paper, a conjugated bi-layer C8 metamaterial is proposed to achieve high negative refractive index for both right-?and left-circular polarized excitations.
Journal ArticleDOI
Dual-band Circular Polarizer Based on Simultaneous Anisotropy and Chirality in Planar Metamaterial.
TL;DR: Simulation and measurement results show that the polarizer presents wide angle circular dichroism and circular birefringence and the fundamental mechanism behind is concluded to be the angle-dependent chirality and dispersion of the novel design.
Journal ArticleDOI
Recent progress and applications of terahertz metamaterials
Journal ArticleDOI
Giant optical activity and circular dichroism in the terahertz region based on bi-layer Y-shaped chiral metamaterial
TL;DR: In this paper, a bi-layer Y-shaped chiral metamaterial (CMM) was proposed to realize a giant optical activity and circular dichroism (CD) effect to the incident linear polarization wave in the terahertz (THz) region.
References
More filters
Journal ArticleDOI
A perfectly matched layer for the absorption of electromagnetic waves
TL;DR: Numerical experiments and numerical comparisons show that the PML technique works better than the others in all cases; using it allows to obtain a higher accuracy in some problems and a release of computational requirements in some others.
Journal ArticleDOI
Gold Helix Photonic Metamaterial as Broadband Circular Polarizer
Justyna K. Gansel,Michael Thiel,Michael S. Rill,Manuel Decker,Klaus Bade,Volker Saile,Georg von Freymann,Stefan Linden,Martin Wegener +8 more
TL;DR: This work investigated propagation of light through a uniaxial photonic metamaterial composed of three-dimensional gold helices arranged on a two-dimensional square lattice that is scalable to other frequency ranges and can be used as a compact broadband circular polarizer.
Journal ArticleDOI
Negative Refractive Index in Chiral Metamaterials
TL;DR: The presence of strong chirality in the terahertz metamaterial lifts the degeneracy for the two circularly polarized waves and allows for the achievement of negative refractive index without requiring simultaneously negative permittivity and negative permeability.
Journal ArticleDOI
Terahertz pulse imaging in reflection geometry of human skin cancer and skin tissue
Ruth M. Woodward,Bryan E. Cole,Vincent P. Wallace,Richard J. Pye,Donald Dominic Arnone,Edmund H. Linfield,Michael Pepper +6 more
TL;DR: By studying the terahertz pulse shape in the time domain, TPI is able to differentiate between diseased and normal tissue for the study of basal cell carcinoma (BCC) and inflammation and scar tissue.
Journal ArticleDOI
Terahertz metamaterial with asymmetric transmission
Ranjan Singh,Eric Plum,Christoph Menzel,Carsten Rockstuhl,Abul Kalam Azad,R. A. Cheville,Falk Lederer,Weili Zhang,Nikolay I. Zheludev +8 more
TL;DR: In this paper, a planar metamaterial, an array of coupled metal split-ring resonators with a unit cell lacking mirror symmetry, exhibits asymmetric transmission of terahertz radiation propagating through it in opposite directions.
Related Papers (5)
Broadband nanowire-grid polarizers in ultraviolet-visible-near-infrared regions
Zhenyu Yang,Yongfeng Lu +1 more
N-single-helix photonic-metamaterial based broadband optical range circular polarizer by induced phase lags between helices
Saraswati Behera,Joby Joseph +1 more