Ultrafast terahertz transmission/group delay switching in photoactive WSe2-functionalized metaphotonic devices

Hu, Yuze; Jiang, Tian; Zhou, Junhu; Hao, Hao; Sun, Hao; Ouyang, Hao; Tong, Mingyu; Tang, Yuxiang; Li, Han; You, Jinhong; Zheng, Xin; Xu, Zhongjie; Cheng, Xin

doi:10.1016/j.nanoen.2019.104280

Cited by 70 publications

(60 citation statements)

References 87 publications

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“…Although 2D materials show extraordinary optical response, the atomic thickness limits their interactions with light [12,32,147]. To further increase the light-matter interaction strength, 2D materials have been integrated onto various photonic cavities forming hybrid structures [42,53,[148][149][150][151]. Shi et al demonstrated a prototype of all-optical modulator based on a graphene-cladded photonic crystal [152].…”

Section: Free Space All-optical Modulationmentioning

confidence: 99%

All-optical modulation with 2D layered materials: status and prospects

et al. 2020

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Abstract Optical modulation technique plays a crucial role in photonics technologies, and there is an ever-increasing demand for broadband and ultrafast optical modulation in the era of artificial intelligence. All-optical modulation is known to be able to operate in an ultrafast way and has a broadband response, showing great potential in applications for ultrafast information processing and photonic computing. Two-dimensional (2D) materials with exotic optoelectronic properties bring tremendous new opportunities for all-optical modulators with excellent performance, which have attracted lots of attention recently. In this review, we cover the state-of-art all-optical modulation based on 2D materials, including graphene, transitional metal dichalcogenides, phosphorus, and other novel 2D materials. We present the operations mechanism of different types of all-optical modulators with various configurations, such as fiber-integrated and free-space ones. We also discuss the challenges and opportunities faced by all-optical modulation, as well as offer some future perspectives for the development of all-optical modulation based on 2D materials.

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Section: Free Space All-optical Modulationmentioning

confidence: 99%

All-optical modulation with 2D layered materials: status and prospects

et al. 2020

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“…To the best of our knowledge, there are mainly four types of switches [66]: the thermo-optic-based [67,68], the optical-limiting-based [69,70], the plasmonic nanostructure-based [71][72][73][74][75] and the SA-based switches [57]. In this context, we will focus our study on the fourth category.…”

Section: Polarization-based All-optical Switch By Ges Flakementioning

confidence: 99%

Polarization-tunable nonlinear absorption patterns from saturated absorption to reverse saturated absorption in anisotropic GeS flake and an application of all-optical switching

et al. 2020

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Due to the unique anisotropic chemical and physical properties, two-dimensional (2D) layered materials, such as IV-VI monochalcogenides with puckered honeycomb structure, have received considerable interest recently. Among the IV-VI layered MX (M = Ge, Sn; X = Se, S) compounds, germanium sulfide (GeS) stands out for its strongest anisotropic thermal conductivities and figure-of-merit values. Additionally, the layer-independent direct energy bands (E g~1 .6 eV, E 1~2 .1 eV) of GeS flake provide excellent insights into further applications as visible photodetectors. Herein, the polarization-tunable nonlinear absorption (NA) patterns of GeS flake have been systematically investigated. Specifically, both the polarization-dependent Raman spectroscopy and the linear absorption (LA) spectroscopy were employed to characterize the lattice orientation and absorption edges of the 251-nm GeS flake. Considering the low damage threshold of GeS flake, the GeS/graphene heterostructure was fabricated to increase the threshold without changing the nonlinear properties of GeS. Our NA results demonstrated that a 600-nm femtosecond laser with different polarizations would excite the saturated-absorption (SA) effect along armchair and reversesaturated-absorption (RSA) effect along zigzag in the GeS/graphene heterostructure. Moreover, the function of the polarization-based GeS/graphene heterostructure all-optical switch was experimentally verified. Notably, thanks to the polarization-dependent NA patterns (SA/RSA) of GeS, the "ON" and "OFF" states of the all-optical switch can be accomplished by high and low transmittance states of continuous-wave laser (532 nm, 80 nW), whose state can be controlled by the polarization of femtosecond switching laser (600 nm, 35 fs, 500 Hz, 12 GW cm −2). The ON/OFF ratio can achieve up to 17% by changing polarization, compared with the ratios of 3.0% by increasing the incident power of switching light in our experiment. The polarization-tunable absorption patterns introduced in this work open up real perspectives for the next-generation optoelectronic devices based on GeS/graphene heterostructure.

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“…One salient example is the chiral metamaterial [16], in which the localized surface plasmon (LSP) resonances would greatly boost the lightmatter interaction and then largely enhance the chiroptical responses [17,18]. When compared with the three-dimensional chiral metamaterials, the two-dimensional (2D) ones seem to be a better candidate for the exploration of optical chirality, considering their exceptional intrinsic properties that benefit the manufacturing of nano-devices requiring small optical losses, compact size, and high compatibility with the complementary metal-oxide-semiconductor (CMOS) foundries [19][20][21][22]. Equally important, the diffractive chiral metamaterials have also emerged as significant platforms to study optical chirality, whose CD responses at higher-order diffracted beams are usually far larger than the case of zeroth-order [3,23].…”

Section: Introductionmentioning

confidence: 99%

Exploiting deep learning network in optical chirality tuning and manipulation of diffractive chiral metamaterials

Tao

Zhang

You³

et al. 2020

Nanophotonics

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AbstractDeep-learning (DL) network has emerged as an important prototyping technology for the advancements of big data analytics, intelligent systems, biochemistry, physics, and nanoscience. Here, we used a DL model whose key algorithm relies on deep neural network to efficiently predict circular dichroism (CD) response in higher-order diffracted beams of two-dimensional chiral metamaterials with different parameters. To facilitate the training process of DL network in predicting chiroptical response, the traditional rigorous coupled wave analysis (RCWA) method is utilized. Notably, these T-like shaped chiral metamaterials all exhibit the strongest CD response in the third-order diffracted beams whose intensities are the smallest, when comparing up to four diffraction orders. Our comprehensive results reveal that by means of DL network, the complex and nonintuitive relations between T-like metamaterials with different chiral parameters (i. e., unit period, width, bridge length, and separation length) and their CD performances are acquired, which owns an ultrafast computational speed that is four orders of magnitude faster than RCWA and a high accuracy. The insights gained from this study may be of assistance to the applications of DL network in investigating different optical chirality in low-dimensional metamaterials and expediting the design and optimization processes for hyper-sensitive ultrathin devices and systems.

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Ultrafast terahertz transmission/group delay switching in photoactive WSe2-functionalized metaphotonic devices

Cited by 70 publications

References 87 publications

All-optical modulation with 2D layered materials: status and prospects

All-optical modulation with 2D layered materials: status and prospects

Polarization-tunable nonlinear absorption patterns from saturated absorption to reverse saturated absorption in anisotropic GeS flake and an application of all-optical switching

Exploiting deep learning network in optical chirality tuning and manipulation of diffractive chiral metamaterials

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