Tunable THz optical bistability in graphene-based heterostructures

Yu, Bao-biao; Deng, Xiaobing; Yuan, Jiren; Liao, Qinghua

doi:10.1080/09500340.2015.1061062

Cited by 6 publications

(2 citation statements)

References 21 publications

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“…Moreover, it has been shown that the linear dispersion properties of graphene should result in strong nonlinear optical behavior at the microwave and THz frequencies [20,21]. Consequently, nonlinear phenomena such as optical bistability have recently been studied for several graphene-based materials in order to achieve low thresholds and efficient optical control at the THz frequencies [22][23][24][25][26]. Specifically, the optical bistability has theoretically been investigated for graphene-wrapped dielectric composite at THz frequencies.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Optical Bistability in the Metal Nanoparticles-Graphene Nanodisks-Quantum Dots Hybrid Systems

Tohari

2020

Nanomaterials

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We theoretically investigate the optical bistability in the metal nanoparticles-graphene nanodisks-quantum dots hybrid plasmonic system in the infrared regime of the electromagnetic radiation. The quantum dot is considered to be a three-level atomic-like system of Λ type interacting with probe and control fields. By using the standard model of the optical bistability where a nonlinear medium is situated in an optical ring cavity, we numerically solve the equation of motion for the density matrix elements that describe the dynamics of the system in steady-state conditions along with the boundary conditions of the cavity to analyze the optical bistability of the system. The effect of the geometrical features of the system and the parameters of the interacting fields including the strength and detuning of the fields on the optical bistability behavior are investigated. Our proposed hybrid plasmonic system shows an ultralow-threshold controllable optical bistability, providing a promising platform for optical bistable devices at the terahertz, such as all-optical switches and biosensors.

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Section: Introductionmentioning

confidence: 99%

Terahertz Optical Bistability in the Metal Nanoparticles-Graphene Nanodisks-Quantum Dots Hybrid Systems

Tohari

2020

Nanomaterials

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“…The working frequency is 𝑓 = 𝜔/2𝜋 = 0.34 THz. [20] It is well known that for a dielectric silica without graphene, there is a Brewster angle for the TM wave given by tan(𝜃 B ) = √ 𝜀 2 , at which the reflected light vanishes (see the red dashed line in Fig. 2(a)).…”

mentioning

confidence: 96%

Tunable Bistability in the Goos–Hänchen Effect with Nonlinear Graphene*

Liu¹,

Ma²,

Yu³

et al. 2019

Chinese Phys. Lett.

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We present a planar model system of a silica covered with a monolayer of nonlinear graphene to achieve a tunable Goos–Hänchen (GH) shift in the terahertz range. It is theoretically found that the transition between a negative shift and a large positive one can be realized by altering the intensity of incident light. Moreover, by controlling the chemical potential of graphene and the incident angle of light, we can further control the tunable GH shift dynamically. Numerical simulations for GH shifts based on Gaussian waves are in good agreement with our theoretical calculations.

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Highly tunable bistability using an external magnetic field in photonic crystals containing graphene and magnetooptical layers

Ardakani

Firoozi

2017

Journal of Applied Physics

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In this paper, we propose an optical bistable structure based on a single graphene layer sandwiched between two magnetooptical layers which are located between two photonic crystals. It is indicated that such structure shows optical bistability behaviors, in the near infrared range, which can be efficiently controlled with small external magnetic fields lower than 1.5 mT. Such weak external magnetic fields cannot affect the graphene layer and the dependence of bistability phenomenon on the magnetic field results from the presence of magnetooptical layers and their influences on the resonance frequency of the structure. Both switch-up and switch-down thresholds can be significantly adjusted by variation of the external magnetic field. Furthermore, the width of hysteresis loop enhances with increasing the magnetic field. To obtain a high tunability of bistability with external magnetic fields, the thickness of magnetooptical layers should be larger than a special value. It is also found that the increase of the Fermi energy level of graphene leads to the enhancement of both switch-up and switch-down thresholds as well as the width of the hysteresis loop. Finally, it is confirmed that optical bistability can be manipulated by changing the incident illumination angle.

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Tunable THz optical bistability in graphene-based heterostructures

Cited by 6 publications

References 21 publications

Terahertz Optical Bistability in the Metal Nanoparticles-Graphene Nanodisks-Quantum Dots Hybrid Systems

Terahertz Optical Bistability in the Metal Nanoparticles-Graphene Nanodisks-Quantum Dots Hybrid Systems

Tunable Bistability in the Goos–Hänchen Effect with Nonlinear Graphene*

Highly tunable bistability using an external magnetic field in photonic crystals containing graphene and magnetooptical layers

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