Ultrafast Terahertz Self-Induced Absorption and Phase Modulation on a Graphene-Based Thin Film Absorber

Koulouklidis, Anastasios D.; Tasolamprou, Anna C.; Doukas, S.; Kyriakou, Eudokia; Ergoktas, M. Said; Daskalaki, Christina; Economou, E. N.; Kocabaş, Coşkun; Lidorikis, Elefterios; Kafesaki, Maria; Tzortzakis, Stelios

doi:10.1021/acsphotonics.2c00828

Cited by 15 publications

(7 citation statements)

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“…In the lower THz region, the optical conductivity of graphene is mainly governed by the intraband transition due to the Fermi level of graphene increasing above half of the photo energy. Here we only consider graphene with the

, hence the conductivity of graphene can be simplified to the Drude-like model [ 42 ]:

where the carrier relaxing time Г defined by

depends on the carriers mobility μ and the Fermi velocity

. Here, we employ μ of 10,000 cm 2 /(V•s) and

of 1.1 × 10 6 m/s throughout the entire calculations.…”

Section: Methodsmentioning

confidence: 99%

Angular-Dependent THz Modulator with Hybrid Metal-Graphene Metastructures

et al. 2023

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The coupling effects of surface plasmon resonance (SPR) from metamaterials induce variation in both the frequency and intensity of plasmonic modes. Here, we report an angular-dependent THz modulator with hybrid metal–graphene metastructures. The metastructures composed of the period gold split-rod arrays on top of a monolayer graphene, which show redshift modulation in the THz region with an increasing incident angle due to the strong out-of-plane magnetic flux introduced by the clockwise circular current at the oblique incidence. By utilizing graphene-based actively tunable conductor with ion-gel electrical gating, the THz transmission can be significantly modified. The modulation depth of the hybrid metal–graphene metastructure modulator can reach ~37.6% at 0.62 THz with a gate voltage of −3 V. The theoretical modeling of transmitted dependency on frequency and incident angle is demonstrated at different Fermi energies, which fits well with the experimental results. This hybrid device can offer a useful method for THz applications (such as angle sensors or angular-resolved spectroscopy), where angle-dependent modulation is needed.

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, hence the conductivity of graphene can be simplified to the Drude-like model [ 42 ]:

where the carrier relaxing time Г defined by

depends on the carriers mobility μ and the Fermi velocity

. Here, we employ μ of 10,000 cm 2 /(V•s) and

of 1.1 × 10 6 m/s throughout the entire calculations.…”

Section: Methodsmentioning

confidence: 99%

Angular-Dependent THz Modulator with Hybrid Metal-Graphene Metastructures

et al. 2023

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“…Their analysis also mapped the temporal dynamics of a THz-induced temperature rise in graphene carriers, thereby explaining the superfast sub-picosecond properties of the entire process. These results can find applications in future dynamically controlled planar optics and in the space-time formation of powerful THz electric fields [68]. Chengqi et al utilized graphene hydrogels with stable and adjustable structures and model scaffolds to investigate the effect of porous structures on the matrix remodeling that is related to the internal growth of cartilage cells in a scaffold.…”

Section: Nanoplatesmentioning

confidence: 99%

Characteristics and Applicability Analysis of Nanomorphological Structures for Chemosensors: A Systematic Review

Han

2023

Chemosensors

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The necessity for complex functionality materials is increasing due to the emergence of high-tech technologies and the deepening needs of B-to-B companies in the industry. Study on advanced multifunctional materials is also increasing due to interest in fields such as the the Internet of Things (IOT), Fourth Industrial Revolution, and artificial intelligence (AI). Nanomaterials have the advantage of having a large surface area, making it easier to express more efficient properties, and they have been widely applied recently in various fields. When designing new materials for specific applications, it is often important to control the shape, size distribution, surface properties, dispersion, and agglomeration stability of synthetic nanoparticles, as well as the elemental and nanocrystalline compositions of the materials. Nanomaterials have infinite potential, but there are not many cases of collection and structural classification. Therefore, I attempted to conduct an in-depth systematic review by categorizing nanomaterials into nanoparticles, nanoplates, nanowires, and nanorolls according to their nanostructures. Additionally, the representative materials of nanowires include CuNW (copper nanowire), AgNW (silver nanowire), and GaAsP single nanowire. Moreover, nanoroll-type materials include SWCNTs (single-walled carbon nanotubes), DWCNTs (double-walled carbon nanotubes), and MWCNTs (multi-walled carbon nanotubes). In conclusion, this study, through a systematic review, is intended to provide a cornerstone for application plans when designing cutting-edge chemosensors.

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“…17 The rapid development of two-dimensional materials, such as graphene, has provided a new perspective on the active control of THz waves (detection, imaging, object cloaking, etc. [18][19][20][21][22][23][24][25][26] ). In particular, the Fermi level of graphene can be shifted by electrostatic tuning of charge density, which enables dynamic manipulation of EM wave frequency and amplitude responses.…”

Section: Introductionmentioning

confidence: 99%