Flexible bi-layer terahertz chiral metamaterials

Sonsilphong, Amornthep; Gutruf, Philipp; Withayachumnankul, Withawat; Abbott, Derek; Bhaskaran, Madhu; Sriram, Sharath; Wongkasem, Nantakan

doi:10.1088/2040-8978/17/8/085101

Cited by 10 publications

(9 citation statements)

References 31 publications

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“…The question arises: have manmade MTMs' exceptional properties, e.g., negative refractive index (NRI) [12,[22][23][24], giant optical activity (chirality) [25][26][27][28][29][30], artificial magnetism [31], acoustic cloaking [32,33], negative Poisson's ratio [34][35][36], etc., truly always been part of existing natural compounds? This article focuses on investigating the existence possibility of negative EM property values, i.e., permittivity, permeability, and refractive index, in Chlorophyll, one of the key natural compounds.…”

Section: Introductionmentioning

confidence: 99%

“…One may also concentrate on high-loss multi absorption bands with negative EM properties in between the transmission bands for other usages. Furthermore, the orientation of the atoms, O and H, and the molecules, CH 3 and CH 3 O, indicate the presence of chirality in the ChloroGreen [27][28][29][30]38]. Since one of the NRI transmission bands are greater than 25% bandwidth, this Chlorophyll-inspired MTM design could operate in the broadband spectral domain.…”

Section: Introductionmentioning

confidence: 99%

“…Since one of the NRI transmission bands are greater than 25% bandwidth, this Chlorophyll-inspired MTM design could operate in the broadband spectral domain. These properties are beneficial for antennas, microwave devices, and optoelectronic devices, especially for filters, beamforming and beam steering, and polarization switching applications [27], to name a few.…”

Section: Introductionmentioning

confidence: 99%

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Chlorophyll-Inspired Tunable Metamaterials With Multi-Negative Refractive Index Bands: The Porphyrin Ring and Hydrophobic Tail Effect

Wongkasem¹

2020

PIER C

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Tunable negative electromagnetic properties: permittivity, permeability, and refractive index, in mimic Chlorophyll metamaterial structures in the X-and Ku-band regimes are theoretically and numerically demonstrated. A very broad negative permeability covering the majority of the X-and Ku bands, from 8 GHz to 16 GHz, is observed, while five negative permittivity bands are found within the same range. The two aforementioned properties result in a broad, greater than 25% bandwidth, low-loss negative-refractive index transmission band. These negative electromagnetic properties can be effectively tailored within the low-loss multi-transmission and the high-loss multi-absorption bands in the operating frequency range by modifying the structure's tiller part or the artificial hydrophobic or Phytol tail. By focusing either on the transmission or the absorption bands, these passive always-on bio-inspired metamaterials could be utilized in microelectronic, communication and photonic, and optic devices.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Chlorophyll-Inspired Tunable Metamaterials With Multi-Negative Refractive Index Bands: The Porphyrin Ring and Hydrophobic Tail Effect

Wongkasem¹

2020

PIER C

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“…4-circular double SRRs with different dimensions have been designed for multi-bands in order to optimize the permittivity characterization [1]. Hence, different MTM structure types, for instance, negative refraction index (NRI) MTMs [42][43][44]52], chiral MTMs [4,[45][46][47], and near-zeroindex (NZI) MTMs [48,49], can be additional choices, where more parameters can be manipulated.…”

Section: Introductionmentioning

confidence: 99%

Multi-Negative Index Band Metamaterial-Inspired Microfluidic Sensors

Wongkasem¹,

Ruiz²

2019

PIER C

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Simple, compact and high sensitivity metamaterial-inspired microfluid sensors are developed to detect and classify dielectric fluids in the X-band regime using reflection coefficients. Multinegative refractive index band metamaterial structure is specifically designed as a sensing enhancer, where the multi-negative bands can effectively trigger the electromagnetic properties, as well as enhance the differentiation between the testing samples. The geometry of the metamaterial enhancer and its arrangement with the microfluidic channel and radiating patch antenna are optimized to reach the highest sensitivity of the samples' depiction. The proposed sensors were tested on ethanol traces, where sets of complex permittivity were varied. Distinguishable frequency responses generated from different samples at four resonances specify the capability of classifying the fluid concentration.

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“…Such designs enable easy fabrication and size-scaling as to tune the chiral response. Here we follow this approach, of the bi-layer conductor configuration, and demonstrate both theoretically and experimentally various chiral metamaterial structures fabricated on flexible substrates using UV-lithography [24,30]; the structures operate in THz and show giant optical activity and negative index of refraction for both leftand right-handed circularly polarized waves. Moreover, the proposed designs can be employed to give optically tunable/ switchable chiral structures [12,13].…”

Section: Introductionmentioning

confidence: 99%

Controlling THz and far-IR waves with chiral and bianisotropic metamaterials

Kenanakis

Economou

Soukoulis

et al. 2015

EPJ Applied Metamaterials

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-Chiral and bianisotropic metamaterials, where coupling of magnetic and electric phenomena plays an important role, offer advanced possibilities for the control and manipulation of electromagnetic waves. Such a control is particularly useful in the THz and far-IR region where natural materials do not show strong response and thus they are not offered as components for a direct realization of electromagnetic wave manipulation. Among the most useful and important capabilities of chiral and bianisotropic metamaterials is the advanced control of the wave polarization that they offer, including giant polarization rotation, conversion, filtering, absorption, etc. In this paper we review our recent work demonstrating some of those capabilities, in a variety of structures, both planar and 3D-bulk ones. The structures presented show, among others, large optical activity, tunable/switchable wave ellipticity, and polarizationdependent asymmetric transmission.

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Flexible bi-layer terahertz chiral metamaterials

Cited by 10 publications

References 31 publications

Chlorophyll-Inspired Tunable Metamaterials With Multi-Negative Refractive Index Bands: The Porphyrin Ring and Hydrophobic Tail Effect

Chlorophyll-Inspired Tunable Metamaterials With Multi-Negative Refractive Index Bands: The Porphyrin Ring and Hydrophobic Tail Effect

Multi-Negative Index Band Metamaterial-Inspired Microfluidic Sensors

Controlling THz and far-IR waves with chiral and bianisotropic metamaterials

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