Self-organization approach for THz polaritonic metamaterials

Reyes–Coronado, Alejandro; Acosta, Maria F.; Merino, Rosa I.; Orera, V. M.; Kenanakis, George; Katsarakis, N.; Kafesaki, Maria; Mavidis, Charalampos P.; Abajo, Javier García de; Economou, E. N.; Soukoulis, Costas M.

doi:10.1364/oe.20.014663

Cited by 44 publications

(40 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The HRS was selected because of its outstanding properties including its low bulk material absorption loss < 0.01 cm -1 from 0.1-1 THz and its stable refractive index n = 3.417 in the frequency range from 0.5-4.0 THz [22]. Materials with ENZ properties can be attained with metamaterials [24,25] or with naturally occurring materials [26][27][28]. In this work, ideal ENZ material is used first.…”

Section: Thz Pcf Configurationsmentioning

confidence: 99%

“…Consequently, some trade-offs had to be managed. It was found that high purity KCl [26] is a good candidate for the THz PCF with its ENZ crossover point near 6.3 THz. The investigated material for the optical PCF was AZO [27,28]; it has its ENZ crossover point at optical frequencies near 1556 nm.…”

Section: Realistic Thz and Optical Pcfsmentioning

confidence: 99%

“…One could simply insert naturally occurring bulk materials having ENZ properties directly into a structured fiber using direct thermal drawing [35], pressure-assisted melt filling techniques [36], or chemical depositions [37][38][39]. Our reported PCF designs could be achieved using the pressure-assisted melt filling technique to insert the bulk-form of KCl [26] or semi-conductor plasmonic materials [40] into the appropriate holes in the host silicon material for the THz PCF. Similarly, it could also be used to insert the bulk-form of Ag or K [41] into the appropriate holes in the host silica material for the optical version.…”

Section: Realistic Thz and Optical Pcfsmentioning

confidence: 99%

See 2 more Smart Citations

Circular hole ENZ photonic crystal fibers exhibit high birefringence

et al. 2018

View full text Add to dashboard Cite

Abstract-A novel photonic crystal fiber (PCF) design that yields very high birefringence is proposed and analyzed. Its significantly enhanced birefringence is achieved by filling selected air holes in the cladding with an epsilon-near-zero (ENZ) material. Extensive simulation results of this asymmetric material distribution in the lower THz range demonstrate that the reported PCF has a birefringence above 0.1 and a loss below 0.01 cm -1 over a wide band of frequencies. Moreover, it exhibits near zero dispersion at 0.75 THz for both the X-and Y-polarization modes and a birefringence equal to 0.28. This THz PCF is then scaled successfully to optical frequencies. While the high birefringence is maintained, this optical PCF has a very high loss in its Y-polarization mode and, consequently, yields single-polarization single-mode (SPSM) propagation, exhibiting near zero dispersion at the optical telecom wavelength of 1.55 μm. The ideal ENZ materials used for these conceptual models are replaced with realistic ones for both the THz and optical PCF designs. With the currently available ENZ materials, the realistic PCFs still have a high birefringence, but with higher losses compared to the idealized results. Future developments of ENZ materials that achieve lower loss properties will mitigate this issue in any frequency band of high interest.

show abstract

Section: Thz Pcf Configurationsmentioning

confidence: 99%

Section: Realistic Thz and Optical Pcfsmentioning

confidence: 99%

Section: Realistic Thz and Optical Pcfsmentioning

confidence: 99%

See 1 more Smart Citation

Circular hole ENZ photonic crystal fibers exhibit high birefringence

et al. 2018

View full text Add to dashboard Cite

show abstract

“…An in-depth overview of this technique is given in chapter 4. The directional solidification of eutectics has been exploited to fabricate split-ring resonator-like structures [ 67 ] and polaritonic MMs for THz applications [ 68 ]. Recently, self-assembly on the short-range scale was also demonstrated by introducing defect states into liquid crystals [ 69 ].…”

Section: Introductionmentioning

confidence: 99%

Self-assembled plasmonic metamaterials

et al. 2013

View full text Add to dashboard Cite

Nowadays for the sake of convenience most plasmonic nanostructures are fabricated by top-down nanofabrication technologies. This offers great degrees of freedom to tailor the geometry with unprecedented precision. However, it often causes disadvantages as well. The structures available are usually planar and periodically arranged. Therefore, bulk plasmonic structures are difficult to fabricate and the periodic arrangement causes undesired effects, e.g., strong spatial dispersion is observed in metamaterials. These limitations can be mitigated by relying on bottom-up nanofabrication technologies. There, self-assembly methods and techniques from the field of colloidal nanochemistry are used to build complex functional unit cells in solution from an ensemble of simple building blocks, i.e., in most cases plasmonic nanoparticles. Achievable structures are characterized by a high degree of nominal order only on a shortrange scale. The precise spatial arrangement across larger dimensions is not possible in most cases; leading essentially to amorphous structures. Such self-assembled nanostructures require novel analytical means to describe their properties, innovative designs of functional elements that possess a desired near-and far-field response, and entail genuine nanofabrication and characterization techniques. Eventually, novel applications have to be perceived that are adapted to the specifics of the self-assembled nanostructures. This review shall document recent progress in this field of research. Emphasis is put on bottom-up amorphous metamaterials. We document the state-of-the-art but also critically assess the problems that have to be overcome.

show abstract

“…Some examples with rods or ribbons with transverse optical modes between 26 and 41 µm have been recently reported, [16] heavier halides shift them to longer wavelengths and eutectics of other compounds are still to be explored from this point of view. [11,12] Phononpolariton metamaterials [13][14][15][16] or nanoplasmonic structures [17] based on eutectics start to be studied, and more recently also www.advopticalmat.de Micropatterned metal-dielectric structures have been proposed for sensors from the visible (VIS) to the THz range; [1,2] complex patterned photonic structures are used and further studied as electromagnetic (EM) wave absorbers for light harvesting in photovoltaics, [3,4] or selective thermal emitters.…”

mentioning

confidence: 99%

Micropillar Templates for Dielectric Filled Metal Arrays and Flexible Metamaterials

Acosta

Rodrigo

Martín‐Moreno

et al. 2016

Advanced Optical Materials

View full text Add to dashboard Cite

1 of 6) 1600670 template-directed directional solidification of salt eutectics have resulted in promising 3D mesostructured materials. [18] The achievement of metal-dielectric (or polaritonic) structures based on this self-assembling approach would constitute a real breakthrough, as large-scale photonic structures would become cheap and easy to manufacture. But eutectic compositions are fixed by thermodynamics, even if kinetics can help to deviate somewhat off the equilibrium composition. One consequence is that eutectic systems that combine metal-dielectric compounds are rare. [17] Binary or multinary eutectics where all final compounds are of similar chemical nature is the common case, and there are many of them among halides [16,19] or oxides. [20] Therefore to get advantage of eutectics to get microstructured metal surfaces, metallization after growth is required. [12] In the literature many eutectic microstructures have been reported: rod, lamellae, and interpenetrated among regular eutectics; cellular, broken-lamellae, globular, spiral, or even SRR (split ring resonator) like geometries, etc., among irregular eutectics, with different degree of homogeneity of interspacing and size of the component phases. The size of the building units is controlled by the solidification rate, so that it covers the range from tenths of micrometers to tens of micrometers. [12,20] Note that large surfaces are easily achieved (few cm 2 size). [16,21,22] Still, the choice of the eutectic system is a compromise between optical properties of the components, microstructure (shape, size, and homogeneity) that is feasible and application wavelength.In the present communication, we report on the fabrication of diverse metal-dielectric microstructures by means of simple procedures and based on a directionally solidified regular eutectic substrate as template. The uniqueness of this approach lies in the achievement of a holey metal film with the holes filled by a polaritonic (polar-dielectric) material, such that diverse microstructures are obtained in large surfaces. Moreover, the dielectric or polaritonic material does not only fill the holes, but can also tower over the metallic surface and participate in the coupling of the external EM waves with the photonic structure. Not less important is the fact that the operating wavelength of the structures can be tailored by design, either through the microstructural size or by the selection of the phonon-polariton resonance of the hole-filling material. Some examples with rods or ribbons with transverse optical modes between 26 and 41 µm have been recently reported, [16] heavier halides shift them to longer wavelengths and eutectics of other compounds are still to be explored from this point of view. The obtained holey metal films with a polaritonic dielectric filling the holes can be exploited either in the form of a surface layer onto a rigid substrate (the eutectic ceramic) or as a flexible metal-dielectric structure.Photonic structures in 2D with building units in the micrometer and na...

show abstract

Self-organization approach for THz polaritonic metamaterials

Cited by 44 publications

References 46 publications

Circular hole ENZ photonic crystal fibers exhibit high birefringence

Circular hole ENZ photonic crystal fibers exhibit high birefringence

Self-assembled plasmonic metamaterials

Micropillar Templates for Dielectric Filled Metal Arrays and Flexible Metamaterials

Contact Info

Product

Resources

About