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Strong and Broadband Pure Optical Activity in 3D Printed THz Chiral Metamaterials
Ioannis Katsantonis, Maria Manousidaki, Anastasios D. Koulouklidis +9
Optical activity (polarization rotation of light) is one of the most desired features of chiral media, as it is important for many polarization related applications. However, in th…
Single scattering and effective medium description in multilayer cylindrical metamaterials: Application to graphene and metasurface coated cylinders
Charalampos P. Mavidis, Anna C. Tasolamprou, Eleftherios N. Economou +2
Coated and multicoated cylinder systems constitute an appealing metamaterial category, as they allow a very rich and highly tunable response, resulting from the interplay of the ma…
Chirality sensing employing PT-symmetric and other resonant gain-loss optical systems
Ioannis Katsantonis, Sotiris Droulias, Costas M. Soukoulis +3
Molecular chirality detection and enantiomer discrimination are very important issues for many areas of science and technology, prompting intensive investigations via optical metho…
Polaritonic cylinders as multifunctional metamaterials: Single scattering and effective medium description
Charalampos P. Mavidis, Anna C. Tasolamprou, Eleftherios N. Economou +2
Polaritonic materials, owing to a strong phonon-polariton resonance in the THz and far-infrared parts of the electromagnetic spectrum, offer both high-index dielectric and metallic…
PT-symmetric chiral metamaterials: Asymmetric effects and PT-phase control
Ioannis Katsantonis, Sotiris Droulias, Costas M. Soukoulis +2
We investigate the influence of chirality on the PT-symmetric and PT-broken phase of PT-symmetric chiral systems. Starting from the point that transverse magnetic (TM) and transver…
The local density of optical states in the 3D band gap of a finite photonic crystal
Charalampos P. Mavidis, Anna C. Tasolamprou, Shakeeb B. Hasan +5
A three-dimensional (3D) photonic band gap crystal is an ideal tool to completely inhibit the local density of optical states (LDOS) at every position in the crystal throughout the…
Accessible phases via wave impedance engineering with PT-symmetric metamaterials
Sotiris Droulias, Ioannis Katsantonis, Maria Kafesaki +2
Optical systems that respect Parity-Time (PT) symmetry can be realized with proper incorporation of gain/loss materials. However, due to the absence of magnetic response at optical…
Toroidal eigenmodes in all-dielectric metamolecules
Anna C. Tasolamprou, Odysseas Tsilipakos, Maria Kafesaki +2
We present a thorough investigation of the electromagnetic resonant modes supported by systems of polaritonic rods placed at the vertices of canonical polygons. The study is conduc…
Nonlinearity in the Dark: Broadband Terahertz Generation with Extremely High Efficiency
Ming Fang, Nian-Hai Shen, Wei E. I. Sha +3
Plasmonic metamaterials and metasurfaces offer new opportunities in developing high performance terahertz emitters and detectors beyond the limitations of conventional nonlinear ma…
Chiral metamaterials with PT symmetry and beyond
Sotiris Droulias, Ioannis Katsantonis, Maria Kafesaki +2
Optical systems with gain and loss that respect Parity-Time (PT) symmetry can have real eigenvalues despite their non-Hermitian character. Chiral systems impose circularly polarize…
Investigation of broadband terahertz generation from metasurface
Ming Fang, Kaikun Niu, Zhiaxiang Huang +4
The nonlinear metamaterials have been shown to provide nonlinear properties with high nonlinear conversion efficiency and in a myriad of light manipulation. Here we study terahertz…
Broadband mixing of -symmetric and -broken phases in photonic heterostructures with a one-dimensional loss/gain bilayer
Ege Özgün, Andriy E. Serebryannikov, Ekmel Ozbay +1
Combining loss and gain components in one photonic heterostructure opens a new route to efficient manipulation by radiation, transmission, absorption, and scattering of electromagn…
Ultrathin metasurface with topological transition for manipulating spoof surface plasmon polaritons
Yihao Yang, Lian Shen, Liqiao Jing +4
Metasurfaces, with intrinsically planar nature and subwavelength thickness, provide us unconventional methodologies to not only mold the flow of propagating waves but also manipula…
Comparison of gold- and graphene-based resonant nano-structures for terahertz metamaterials and an ultra-thin graphene-based modulator
Nian-Hai Shen, Philippe Tassin, Thomas Koschny +1
Graphene exhibits unique material properties and in electromagnetic wave technology, it raises the prospect of devices miniaturized down to the atomic length scale. Here we study s…
Dielectric Metamaterials with Toroidal Dipolar Response
Alexey A. Basharin, Maria Kafesaki, Eleftherios N. Economou +4
Toroidal multipoles are the terms missing in the standard multipole expansion; they are usually overlooked due to their relatively weak coupling to the electromagnetic fields. Here…
Graphene for terahertz applications
Philippe Tassin, Thomas Koschny, Costas M. Soukoulis
Graphene is a one-atom-thick sheet of carbon atoms arranged in a honeycomb lattice. It was first obtained by exfoliation of graphite in 2004 and has since evolved into a thriving r…
One- and two-dimensional photo-imprinted diffraction gratings for manipulating terahertz waves
Ioannis Chatzakis, Philippe Tassin, Liang Luo +5
Emerging technology based on artificial materials containing metallic structures has raised the prospect for unprecedented control of terahertz waves through components like filter…
Robust wedge demonstration to optical negative index metamaterials
Nian-Hai Shen, Thomas Koschny, Maria Kafesaki +1
A robust wedge setup is proposed to unambiguously demonstrate negative refraction for negative index metamaterials. We applied our setup to several optical metamaterials from the l…
Strong group velocity dispersion compensation with phase-engineered sheet metamaterials
Babak Dastmalchi, Philippe Tassin, Thomas Koschny +1
Resonant metamaterials usually exhibit substantial dispersion, which is considered a shortcoming for many applications. Here we take advantage of the ability to tailor the dispersi…
Large quality factor in sheet metamaterials made from dark dielectric meta-atoms
Aditya Jain, Philippe Tassin, Thomas Koschny +1
Metamaterials-or artificial electromagnetic materials-can create media with properties unattainable in nature, but mitigating dissipation is a key challenge for their further devel…
Photonic band gap of a graphene-embedded quarter-wave stack
Yuancheng Fan, Zeyong Wei, Hongqiang Li +2
Here, we present a mechanism for tailoring the photonic band structure of a quarter-wave stack without changing its physical periods by embedding conductive sheets. Graphene is uti…
Toroidal Response in Dielectric Metamaterials
Alexey A. Basharin, Maria Kafesaki, Eleftherios N. Economou +1
We present and analyze a dielectric cluster based on subwavelength LiTaO3 polaritonic cylinders for demonstrating toroidal response in THz regime due to mutual coupling of Mie- res…
Enhancing Optical Gradient Forces with Metamaterials
Vincent Ginis, Philippe Tassin, Costas M. Soukoulis +1
We demonstrate how the optical gradient force between two waveguides can be enhanced using transformation optics. A thin layer of double-negative or single-negative metamaterial ca…
Effective material parameter retrieval for thin sheets: theory and application to graphene, thin silver films, and single-layer metamaterials
Philippe Tassin, Thomas Koschny, Costas M. Soukoulis
An important tool in the field of metamaterials is the extraction of effective material parameters from simulated or measured scattering parameters of a sample. Here we discuss a r…