Monolayer graphene based organic optical terahertz modulator

Wang, Guocui; Zhang, Bo; Ji, Hongyu; Liu, Xin; He, Ting; Lv, Longfeng; Hou, Yanbing; Shen, Jingling

doi:10.1063/1.4973816

Cited by 32 publications

(9 citation statements)

References 33 publications

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“…Up to now, besides the traditional modulators (electro‐optic, thermo‐optic, terahertz, plasmonic), all‐optical modulators based on layered materials, including graphene, phosphorene, and 2D boron, have also developed rapidly. In these devices, by tuning the carrier density via electrical or optical means that modify their physical properties, optical response of the layered materials can be instantly changed, thus making them versatile nanostructures for optical modulation.…”

Section: Novel Optical Devices Using 2d Layered Materialsmentioning

confidence: 99%

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

Guo

Xiao

Wang

et al. 2019

Laser & Photonics Reviews

404

197

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In recent years, 2D layered materials, including graphene, topological insulators, transition metal dichalcogenides, black phosphorus, MXenes, graphitic carbon nitride, and metal‐organic frameworks, have attracted considerable interest due to their potential applications in the fields of physics, chemistry, biology, and energy. Their rise in the field of nonlinear photonics began around 2009 and has become an important research direction. Here, the synthesis techniques, nonlinear optical properties, integration strategies, and device applications of layered materials are reviewed. In terms of nonlinear optical properties, the focus is on saturable absorption and Kerr nonlinearity. On this basis, their applications in various pulsed lasers, including fiber lasers, solid‐state lasers, waveguide lasers, and related nonlinear optical phenomenon, are summarized. In addition, novel optical devices using layered materials, such as optical modulators, optical polarizers, optical switchers, and even all‐optical device, are also involved. It is believed that the development of 2D layered materials in the field of photonics will continue to deepen, thus laying a good foundation for its practical application.

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Section: Novel Optical Devices Using 2d Layered Materialsmentioning

confidence: 99%

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

Guo

Xiao

Wang

et al. 2019

Laser & Photonics Reviews

404

197

View full text Add to dashboard Cite

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“…The effect of the photo-induced THz absorption can be characterized by a modulation factor (MF) defined as 22,23…”

mentioning

confidence: 99%

Impurity-induced modulation of terahertz waves in optically excited GaAs

et al. 2017

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The effect of the photoinduced absorption of terahertz (THz) radiation in a semi-insulating GaAs crystal is studied by the pulsed THz transmission spectroscopy. We found that a broad-band modulation of THz radiation may be induced by a low-power optical excitation in the spectral range of the impurity absorption band in GaAs. The measured modulation factor achieves 80%. The amplitude and frequency characteristics of the resulting THz modulator are critically dependent on the carrier density and relaxation dynamics in the conduction band of GaAs. In semi-insulating GaAs crystals, the carrier density created by the impurity excitation is controlled by the rate of their relaxation to the impurity centers. The relaxation rate and, consequently, the frequency characteristics of the modulator can be optimized by an appropriate choice of the impurities and their concentrations. The modulation parameters can be also controlled by the crystal temperature and by the power and photon energy of the optical excitation. These experiments pave the way to the low-power fast optically-controlled THz modulation, imaging, and beam steering.

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“…Further increasing the SiO 2 thickness results in increased transmittance: for the thickness of 287 nm, the transmittance is 30%. To evaluate the modulation efficiency of different samples, we make use of the modulation factor (MF), which is defined as the change of the integrated transmitted THz power under the illumination [24],…”

Section: Thz Photomodulation Experimentsmentioning

confidence: 99%

Terahertz Single-Pixel Imaging Improved by Using Silicon Wafer with SiO2 Passivation

et al. 2020

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We demonstrate terahertz single-pixel imaging is improved by using a photomodulator based on silicon passivated with SiO 2 . By exploring various SiO 2 thicknesses, we show that the modulation factor of the as-fabricated terahertz photomodulator can reach 0.9, three times that based on bare silicon. This improvement originates from chemical passivation, as well as anti-reflection. Single-pixel imaging experiments based on the compressed sensing method show that reconstructed images adopting the new photomodulator have better quality than the conventional terahertz modulator based on bare silicon. Since the passivation process is routine and low cost, we expect this work will reduce the cost of terahertz photomodulator and single-pixel THz imaging, and advance their applications.

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Monolayer graphene based organic optical terahertz modulator

Cited by 32 publications

References 33 publications

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

2D Layered Materials: Synthesis, Nonlinear Optical Properties, and Device Applications

Impurity-induced modulation of terahertz waves in optically excited GaAs

Terahertz Single-Pixel Imaging Improved by Using Silicon Wafer with SiO2 Passivation

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