Absorption-induced transparency metamaterials in the terahertz regime

Rodrigo, Sergio G.; Martín‐Moreno, Luis

doi:10.1364/ol.41.000293

Cited by 14 publications

(14 citation statements)

References 38 publications

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“…Even an AIT-based molecular detection method has been recently proposed. [30] It is important to remark that in this communication AIT is experimentally demonstrated in the THz regime for the first time.…”

Section: Micropillar Templates For Dielectric Filled Metal Arrays Andmentioning

confidence: 76%

“…They are a consequence of enhanced optical transmission (EOT) related phenomena, [23] also assisted by the particle-like EM resonances excited in the pillars. [30] It is important to remark that in this communication AIT is experimentally demonstrated in the THz regime for the first time. [24,25] The first ones play the leading role in these structures.…”

Section: Micropillar Templates For Dielectric Filled Metal Arrays Andmentioning

confidence: 94%

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Micropillar Templates for Dielectric Filled Metal Arrays and Flexible Metamaterials

Acosta

Rodrigo

Martín‐Moreno

et al. 2016

Advanced Optical Materials

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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...

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Section: Micropillar Templates For Dielectric Filled Metal Arrays Andmentioning

confidence: 76%

Section: Micropillar Templates For Dielectric Filled Metal Arrays Andmentioning

confidence: 94%

Micropillar Templates for Dielectric Filled Metal Arrays and Flexible Metamaterials

Acosta

Rodrigo

Martín‐Moreno

et al. 2016

Advanced Optical Materials

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“…The effectiveness of IT is determined by the absorption linewidth, the oscillator strength (or the dipole moment) of the absorber, and the Q‐factor of the plasmonic component of the system. All the factors considered above make it possible to unambiguously correlate spectral dips with electronic, vibrational, and even rotational transitions of the absorbers, which also contributes to the high specificity of the IT effect in sensing applications.…”

Section: Discussionmentioning

confidence: 99%

“…Apart from IT, that results from the plasmon energy transfer, strong light–matter coupling, or destructive interference (as described above), nonresonant absorption‐induced transparency (AIT) is a very attractive modality for the implementation of sensitive devices. AIT can be implemented using a metal film perforated with an array of holes with a diameter smaller than the wavelength of light or an array of bow‐tie nanostructures coated with a film of a molecular absorber . Several methods of fabrication can be used to produce nanohole arrays, including electron beam, focused ion beam lithographies, nanosphere lithography and nanoimprinting .…”

Section: The Geometries and Morphologies Of Plasmon–exciton Nanostrucmentioning

confidence: 99%

Induced Transparency in Plasmon–Exciton Nanostructures for Sensing Applications

Krivenkov

Goncharov

Nabiev

et al. 2018

Laser & Photonics Reviews

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The effect of induced transparency, which is related to photoinduced bleaching of photoabsorbers, is being intensely studied and has many applications in the field of sensing. Along with this classical effect, numerous studies on induced transparency in coupled plasmon-exciton systems, which is accompanied by the formation of hybrid states, have been recently published. The formation of a new coupled system results in various spectral modifications. For example, induced transparency manifests itself as a narrow dip in the absorption spectrum of a coupled system. This effect can be used in sensing, the feasibility of which is the main objective here, where a variety of materials and methods for obtaining the induced transparency are considered. Various morphologies and geometries of plasmonic nanoparticles are discussed as well as types of molecular absorbers to assess the most favorable combinations for the evolvement of induced transparency. The potential applications of the induced transparency effect in sensing and molecular diagnostics are summarized.As shown above, the IT effect is highly sensitive to several parameters of the composite system: the distance between the absorber and the plasmonic structure, their mutual arrangement, and the type and properties of the absorber itself. At the same time, the

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“…The AIT-based structure can be seen as a ''metametal'' which optical response can be described by means of a Drude-Lorentz model [11,20] like in good metals. The Drude term is defined by the geometry, instead of the metal properties [21,22], while the Lorentz term in AIT arises from each resonance of the molecules, instead of originating from interband transitions as it happens in metals.…”

Section: Absorption-induced Transparencymentioning

confidence: 99%

Terahertz gas sensor based on absorption-induced transparency

Rodrigo

2016

EPJ Applied Metamaterials

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-A system for the detection of spectral signatures of gases at the Terahertz regime is presented. The system consists in an initially opaque holey metal film whereby the introduction of a gas provokes the appearance of spectral features in transmission and reflection, due to the phenomenom of absorption-induced transparency (AIT). The peaks in transmission and dips in reflection observed in AIT occur close to the absorption energies of the molecules, hence its name. The presence of the gas would be thus revealed as a strong drop in reflectivity measurements at one (or several) of the gas absorption resonances. As a proof of principle, we theoretically demonstrate how the AIT-based sensor would serve to detect tiny amounts of hydrocyanic acid.

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Absorption-induced transparency metamaterials in the terahertz regime

Cited by 14 publications

References 38 publications

Micropillar Templates for Dielectric Filled Metal Arrays and Flexible Metamaterials

Micropillar Templates for Dielectric Filled Metal Arrays and Flexible Metamaterials

Induced Transparency in Plasmon–Exciton Nanostructures for Sensing Applications

Terahertz gas sensor based on absorption-induced transparency

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