Tunable graphene antennas for selective enhancement of THz-emission

Filter, Robert; Farhat, Mohamed; Steglich, Mathias; Alaee, Rasoul; Rockstuhl, Carsten; Lederer, F.

doi:10.1364/oe.21.003737

Cited by 108 publications

(75 citation statements)

References 47 publications

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“…Optical nanoantennas consisting of single or paired metallic nanostructures have been demonstrated to be effective in coupling the propagating light to and from a nano-dimensional volume [13][14][15][16] . When a nanoantenna is irradiated by light, coherent and collective oscillations of conduction-band free electrons (surface plasmons) can localize light to a subdiffraction-limited region, enabling the controllable local field enhancement in the proximity of the nanoantenna.…”

Section: Resultsmentioning

confidence: 99%

Nanoantenna harmonic sensor: theoretical analysis of contactless detection of molecules with light

Farhat

Cheng

et al. 2015

Nanotechnology

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Corresponding and requests for material should be addressed to P.-Y.C. (pychen@wayne.edu) AbstractNonlinear harmonic sensor is a popular wireless sensor and radiofrequency identification (RFID) technique, which allows high-performance sensing in a severe interference/clutter background by transmitting a radio-wave and detecting its modulated higher-order harmonics. Here we introduce the concept and design of optical harmonic tags based on nonlinear nanoantennas that can contactlessly detect electronic (e.g. electron affinity) and optical (e.g. relative permittivity) characteristics of molecules. By using a dual-resonance, gold-molecule-silver nanodipole antenna, within the quantum mechanical realm, the spectral form of the second-harmonic scattering can sensitively reveal the physical properties of molecules, paving a new route towards optical molecular sensors and optical identification (OPID) of biological, genetic, and medical events for the "internet of nano-things." 2

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Section: Resultsmentioning

confidence: 99%

Nanoantenna harmonic sensor: theoretical analysis of contactless detection of molecules with light

Farhat

Cheng

et al. 2015

Nanotechnology

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“…A beam reconfigurable antenna was also designed [338], using switchable high impedance surfaces. Several tunable graphene-based antenna schemes using plasmon modes have been developed [302,[339][340][341][342]. Such plasmonic Figure 11.…”

Section: Thz Plasmonicsmentioning

confidence: 99%

Terahertz science and technology of carbon nanomaterials

2014

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Abstract. The diverse applications of terahertz radiation and its importance to fundamental science makes finding ways to generate, manipulate, and detect terahertz radiation one of the key areas of modern applied physics. One approach is to utilize carbon nanomaterials, in particular, single-wall carbon nanotubes and graphene. Their novel optical and electronic properties offer much promise to the field of terahertz science and technology. This article describes the past, current, and future of the terahertz science and technology of carbon nanotubes and graphene. We will review fundamental studies such as terahertz dynamic conductivity, terahertz nonlinearities, and ultrafast carrier dynamics as well as terahertz applications such as terahertz sources, detectors, modulators, antennas, and polarizers.

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“…[1][2][3] Several efforts have been made for advancing the THz devices, [4][5][6] among which the THz absorber is believed to be a crucial component in developing THz detectors and sensors.…”

Section: Introductionmentioning

confidence: 99%

Electrically tunable terahertz dual-band metamaterial absorber based on a liquid crystal

Yin

Xia

et al. 2018

RSC Adv.

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In this paper, a liquid crystal (LC) based tunable metamaterial absorber with dual-band absorption is presented. The proposed absorber is analysed both numerically and experimentally. The analysis shows that the two absorption peaks, originating from the new resonant structure, are experimentally detected at 269.8 GHz and 301.4 GHz when no bias voltage is applied to the LC layer. In order to understand the absorption mechanisms, simulation results for the surface current and power loss distributions are presented. Since liquid crystals are used as the dielectric layer to realize the electrically tunable absorber, a frequency tunability of 2.45% and 3.65% for the two absorption peaks is experimentally demonstrated by changing the bias voltage of the LC layer from 0 V to 12 V. Furthermore, the absorber is polarization independent and a high absorption for a wide range of oblique incidence is achieved. The designed absorber provides a way forward for the realization of tunable metamaterial devices that can be applied in multi-band detection and imaging.

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Tunable graphene antennas for selective enhancement of THz-emission

Cited by 108 publications

References 47 publications

Nanoantenna harmonic sensor: theoretical analysis of contactless detection of molecules with light

Nanoantenna harmonic sensor: theoretical analysis of contactless detection of molecules with light

Terahertz science and technology of carbon nanomaterials

Electrically tunable terahertz dual-band metamaterial absorber based on a liquid crystal

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