Characterization and performance analysis of a chiral-metamaterial channel with Giant Optical Activity for terahertz communications

Vegni, Anna Maria; Loscrì, Valeria

doi:10.1016/j.nancom.2016.07.004

Cited by 6 publications

(5 citation statements)

References 14 publications

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“…Based on the study of chirality, abundant applications have been realized in many fields of nanoscience, such as material synthesis and catalysis, [44] optical communications, [45] light harvesting, [46] and light emitting devices. [47] When the chiral structure interacts with monochromatic light, based on the Maxwell's equations and the general consti tutive relations, [10] an electric dipole p and a magnetic dipole m can be produced …”

Section: Chiral Moleculesmentioning

confidence: 99%

“…In the natural world, there are various chiral molecules caused by diverse symmetry breaking, for example, central chi rality (Figure 1a), helical chirality (Figure 1b), axial chirality ( Figure 1c) and planar chirality (Figure 1d), inspiring the inves tigation of chiral properties. Based on the study of chirality, abundant applications have been realized in many fields of nanoscience, such as material synthesis and catalysis, [44] optical communications, [45] light harvesting, [46] and light emitting devices. [47] When the chiral structure interacts with monochromatic light, based on the Maxwell's equations and the general consti tutive relations, [10] an electric dipole p and a magnetic dipole m can be produced…”

Section: Chiral Moleculesmentioning

confidence: 99%

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Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Luo

Chi

Jiang

et al. 2017

Advanced Optical Materials

170

122

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(circular birefringence) and absorption losses (circular dichroism) with the circu larly polarized light (CPL) illumination. [10] CB arises from the difference in the real part of refractive index, leading to a dif ferent velocity for LCP and RCP compo nents, and thus results in the polarization rotation of the linearly polarized incident light. CD corresponds to the difference in the imaginary part of refractive index, resulting in a distinct absorption loss for LCP and RCP excitations. Besides the con ventional CD and CB, asymmetric trans mission (circular conversion dichroism) is another fundamental chiroptical pheno menon, which exists in the nondiffracting array, referring to different LCPtoRCP and RCPtoLCP conversion efficiencies. [11] All of these chiroptical phenomena have been successfully applied in the spectros copy for identifying special arrangements of chiral matters in biology, chemistry and physics as efficient diagnostic tools. [12][13][14][15][16] However, the chirop tical response in natural chiral materials is relatively weak due to the small electromagnetic (EM) interaction volume, [17] hence limits its further applications.Recent progress in plasmonics paves the way for the enhancement of chiroptical response. [18][19][20] Surface plasmons (SPs), as the collective electrons oscillation at the dielectric and metal interface, [21][22][23] present the capacity of light confine ment and field enhancement, which significantly improve the strength of lightmatter interactions. [24][25][26][27][28] With the uptodate nanofabrication technology, the study field of chirality has been extended from traditional chiral molecules to 3D metallic nanostructures. [29][30][31][32] Chiroptical responses of metallic meta molecules have been widely investigated, [33][34][35] and applied in various fields, such as biosensing, [36] chiral catalysis, [37] polari zation tuning, [38] and chiral photo detection.[39] The 3D metallic structure exhibited giant optical activity response because of the strong interaction between electric and magnetic resonant modes. [40,41] Different from 3D chiral ensembles, planar chiral structures show none chiral effect, as they can always coincide with their mirror images. However, 2D chirality was successfully found in the quasitwodimensional (quasi2D) chiral structure. [42] Moreover, recent reports show that even achiral nanomaterials have the ability to generate strong CD under an oblique CPL illumination. [43] This kind of extrinsic chirality arises from sym metry breaking of the incident light and the quasi2D material, which is quite different from the intrinsic chirality of 3D chiral The plasmonic chiroptical effect has been used to manipulate chiral states of light, where the strong field enhancement and light localization in metallic nanostructures can amplify the chiroptical response. Moreover, in metamaterials, the chiroptical effect leads to circular dichroism (CD), circular birefringence (CB), and asymmetric transmission. Potential applications enabled by chiral plasmonics...

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Section: Chiral Moleculesmentioning

confidence: 99%

Section: Chiral Moleculesmentioning

confidence: 99%

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Luo

Chi

Jiang

et al. 2017

Advanced Optical Materials

170

122

View full text Add to dashboard Cite

show abstract

“…It causes no damage to the living organism and has therefore promising application prospects in the field of biological biopsy [3][4][5]. Secondly, the wide spectral range of the THz waves can be used to characterize the composition of matter [6,7]. Thirdly, the THz waves are highly penetrating for many substances, providing a different and more efficient solution for search and rescue [8,9].…”

Section: Introductionmentioning

confidence: 99%

Terahertz Thermal Sensing by Using a Defect-Containing Periodically Corrugated Gold Waveguide

Xue

Wang

et al. 2020

Applied Sciences

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A terahertz (THz) thermal sensor has been developed by using a periodically corrugated gold waveguide. A defect was positioned in the middle of this waveguide. The periodicities of waveguides can result in Bragg and non-Bragg gaps with identical and different transverse mode resonances, respectively. Due to the local resonance of the energy concentration in the inserted tube, a non-Bragg defect state (NBDS) was observed to arise in the non-Bragg gap. It exhibited an extremely narrow transmission peak. The numerical results showed that by using the here proposed waveguide structure, a NBDS would appear at a resonance frequency of 0.695 THz. In addition, a redshift of this frequency was observed to occur with an increase in the ambient temperature. It was also found that the maximum sensitivity can reach 11.5 MHz/K for an optimized defect radius of 0.9 times the mean value of the waveguide inner tube radius, and for a defect length of 0.2 (or 0.8) times the corrugation period. In the present simulations, a temperature modification of the Drude model was also used. By using this model, the thermal sensing could be realized with an impressive sensitivity. This THz thermal sensor is thereby very promising for applications based on high-precision temperature measurements and control.

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“…Moreover, their use in enhancing light absorption of photovoltaic solar cells gained huge attention and many techniques to increase the efficiency of light harvesting have been investigated [ La Spada and Vegni , ]. Applications of surface waves are also in communications [ Vegni and Loscrì , ]: their use in optical technology can reduce dissipation and promoting short‐, as well as, long‐range communications, bringing the advantages realized with optical fibers to the nanoscale.…”

Section: Introductionmentioning

confidence: 99%

Modeling and design for electromagnetic surface wave devices

2017

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A great deal of interest has reemerged recently in the study of surface waves. The possibility to control and manipulate electromagnetic wave propagations at will opens many new research areas and leads to lots of novel applications in engineering. In this paper, we will present a comprehensive modeling and design approach for surface wave cloaks, based on graded‐refractive‐index materials and the theory of transformation optics. It can be also applied to any other forms of surface wave manipulation, in terms of amplitude and phase. In this paper, we will present a general method to illustrate how this can be achieved from modeling to the final design. The proposed approach is validated to be versatile and allows ease in manufacturing, thereby demonstrating great potential for practical applications.

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Characterization and performance analysis of a chiral-metamaterial channel with Giant Optical Activity for terahertz communications

Cited by 6 publications

References 14 publications

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Plasmonic Chiral Nanostructures: Chiroptical Effects and Applications

Terahertz Thermal Sensing by Using a Defect-Containing Periodically Corrugated Gold Waveguide

Modeling and design for electromagnetic surface wave devices

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