Investigation of the properties of weakly reflective metamaterials with compensated chirality

Semchenko, I. V.; Khakhomov, Sergei; Asadchy, Viktar; Naumova, E. V.; Prinz, V. Ya.; Golod, S. V.; Milekhin, A. G.; Гончаренко, А. М.; Синицын, Г. В.

doi:10.1134/s1063774514040178

Cited by 8 publications

(6 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…For instance, by arranging orthogonal helices in staggered order or in the form of mutually perpendicular rows, one can create, by analogy with structures based on microhelices prepared from thin strained films, bi‐anisotropic chiral metasurfaces . Chirality‐compensated helices Figure S1c (Supporting Information) can be used in the development of absorbing nonreflective coatings and broad‐band polarizers . Interesting properties are also demonstrated by closed toroidal helices, Figure S1d (Supporting Information).…”

Section: Design Of Metasurfacementioning

confidence: 99%

Large‐Area 3D‐Printed Chiral Metasurface Composed of Metal Helices

Golod

Seyfi

Buldygin

et al. 2018

Advanced Optical Materials

View full text Add to dashboard Cite

of semiconductor technology, such as consecutive lithographic steps with layers alignment, and the deposition and chemical etching of materials, are used. Besides, for preventing the capillary sticking of 3D microstructures and nanostructures, special treatments of surfaces and the supercritical drying technique are used after liquid-etching and resistdevelopment steps. [15,16] In ref.[17], a method was proposed for fabrication of microhelices and nanohelices from elastically strained thin semiconductor strips detached, with the help of selective etching of a sacrificial layer, from the substrate and then rolled in classically shaped 3D helices. The latter approach, combined with supercritical drying, [16] was successively employed for forming, on a GaAs substrate, a chiral metamaterial in the form of a single-layer array of 14.5 µm diameter 3D microhelices fabricated from a strained hybrid semiconductor-metal (In 0.2 Ga 0.8 As/GaAs/Ti/Au) films. [18,19] It was shown that the maximum polarization-plane rotation angle for terahertz radiation having passed the heliceson-substrate system reached 17° at 2.1 THz frequency. A close value for the polarization-plane rotation angle of terahertz radiation, 14°, was also obtained using a structure that involved 3D metal gammadion-shaped elements located directly on the surface of pyramidal trenches etched in a silicon substrate. [20] Experimental data obtained for both chiral metamaterials proved a high effectiveness of the interaction of electromagnetic radiation with the 3D conducting microresonators, thus encouraging the workers to spent further efforts on the search for simpler and cheaper technological solutions.Today, rapid progress in the development of additive technologies [21,22] opens up wide opportunities in the field of 3D chiral resonator elements, 3D metamaterials, and photonic crystals. [23][24][25] A number of sequential 3D printing methods have enabled the point-by-point formation of free-standing conducting helices for chiral metamaterials active in a broad range of radiation wavelengths, from microwave (MW) to optical frequencies. Those methods can be classed to several groups. First, these are methods including the electrochemical and chemical deposition of metals onto the surface of printed 3D polymer structures: i) filling of helically shaped channels with a metal [9,26] and ii) covering of free-standing 3D helical microcarcasses with a metal. [27] Second, this is the growth of An original design for chiral metasurfaces formation is proposed. The hybrid fabrication approach is based on the 3D printing of polymer substrates with a shape-generating "helical" relief, molding, and subsequent shadow metal deposition. The formed double-layer grating of multiturn metal helices rotates the polarization plane of sub-terahertz and microwave radiation through an angle in excess of 40°. Both experimentally and in numerical simulations, it is demonstrated that re-reflection phenomena occur in the "metal helixpolymer substrate" hybrid structure. Those phenomena per...

show abstract

Section: Design Of Metasurfacementioning

confidence: 99%

Large‐Area 3D‐Printed Chiral Metasurface Composed of Metal Helices

Golod

Seyfi

Buldygin

et al. 2018

Advanced Optical Materials

View full text Add to dashboard Cite

show abstract

“…To illustrate the embedding approach the two-dimensional weakly reflective metamaterial with compensated chirality on GaAs substrate 84 is taken as an initial structure ( Fig. 4e ).…”

Section: Resultsmentioning

confidence: 99%

Terahertz metamaterials and systems based on rolled-up 3D elements: designs, technological approaches, and properties

Prinz

Naumova

Golod

et al. 2017

Sci Rep

View full text Add to dashboard Cite

Electromagnetic metamaterials opened the way to extraordinary manipulation of radiation. Terahertz (THz) and optical metamaterials are usually fabricated by traditional planar-patterning approaches, while the majority of practical applications require metamaterials with 3D resonators. Making arrays of precise 3D micro- and nanoresonators is still a challenging problem. Here we present a versatile set of approaches to fabrication of metamaterials with 3D resonators rolled-up from strained films, demonstrate novel THz metamaterials/systems, and show giant polarization rotation by several chiral metamaterials/systems. The polarization spectra of chiral metamaterials on semiconductor substrates exhibit ultrasharp quasiperiodic peaks. Application of 3D printing allowed assembling more complex systems, including the bianisotropic system with optimal microhelices, which showed an extreme polarization azimuth rotation of 85° with drop by 150° at a frequency shift of 0.4%. We refer the quasiperiodic peaks in the polarization spectra of metamaterial systems to the interplay of different resonances, including peculiar chiral waveguide resonance. Formed metamaterials cannot be made by any other presently available technology. All steps of presented fabrication approaches are parallel, IC-compatible and allow mass fabrication with scaling of rolled-up resonators up to visible frequencies. We anticipate that the rolled-up meta-atoms will be ideal building blocks for future generations of commercial metamaterials, devices and systems on their basis.

show abstract

“…The metal helices are widely used as elements of metamaterials because at transmission of electrical current in them the electric dipole moments and magnetic moments are simultaneously generated. Consequently metamaterial based on helical elements displays as dielectric and magnetic properties, which enhances its use [1][2][3][4][5][6][7][8][9][10][11] (Fig.1). A special place among the helices take bifilar helices consisting of two helical conductors.…”

Section: Introductionmentioning

confidence: 99%

The equilibrium state of bifilar helix as element of metamaterials

Semchenko¹,

Samofalov²,

Qian³

et al. 2016

Proc. 14th Int. Conf. On Global Research and Education, Inter-Academia 2015

View full text Add to dashboard Cite

In the present article, we study the long bifilar helix in which electric currents are quasi-stationary, i.e. the wavelength of the electromagnetic field is much longer than the turn of the helix. All components of the force acting on a physically small element of one helix from the other helix having a big length are calculated. The case when the currents in the two helices have the same direction relative to the x axis is considered. The dependence of the radial component of the force of interaction between two helices on the pitch angle is determined. At various pitch angles the helices can attract and repel each other while the direction of the current does not change. It is found the value of pitch angle when two helices do not interact and bifilar helix, formed by them, is in equilibrium state.

show abstract

Investigation of the properties of weakly reflective metamaterials with compensated chirality

Cited by 8 publications

References 12 publications

Large‐Area 3D‐Printed Chiral Metasurface Composed of Metal Helices

Large‐Area 3D‐Printed Chiral Metasurface Composed of Metal Helices

Terahertz metamaterials and systems based on rolled-up 3D elements: designs, technological approaches, and properties

The equilibrium state of bifilar helix as element of metamaterials

Contact Info

Product

Resources

About