Terahertz surface emission of 
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-band electrons from a layered tungsten disulfide crystal by the surface field

Zhang, Longhui; Huang, Yuanyuan; Zhao, Qiyi; Zhu, Lihua; Yao, Zehan; Zhou, Yixuan; Du, Wanyi; Xu, Xinlong

doi:10.1103/physrevb.96.155202

Cited by 46 publications

(41 citation statements)

References 42 publications

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“…Research on THz technologies with 2DLMs has attracted huge interest. In contrast to numerous fascinating theoretical concepts proposed on THz generation in graphene, currently the main experimental demonstrations still concentrate on bulk materials (e.g., thick‐layer graphite, topological insulators, thick‐layer MoS 2 , and WS 2 ). There are only a few experimental demonstrations with monolayer and few‐layer graphene for ultrafast, broadband, and cost‐effective THz light emission .…”

Section: Perspectives Of 2dlm‐based Nonlinear Opticsmentioning

confidence: 99%

Nonlinear Optics with 2D Layered Materials

et al. 2018

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2D layered materials (2DLMs) are a subject of intense research for a wide variety of applications (e.g., electronics, photonics, and optoelectronics) due to their unique physical properties. Most recently, increasing research efforts on 2DLMs are projected toward the nonlinear optical properties of 2DLMs, which are not only fascinating from the fundamental science point of view but also intriguing for various potential applications. Here, the current state of the art in the field of nonlinear optics based on 2DLMs and their hybrid structures (e.g., mixed-dimensional heterostructures, plasmonic structures, and silicon/fiber integrated structures) is reviewed. Several potential perspectives and possible future research directions of these promising nanomaterials for nonlinear optics are also presented.

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Section: Perspectives Of 2dlm‐based Nonlinear Opticsmentioning

confidence: 99%

Nonlinear Optics with 2D Layered Materials

et al. 2018

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“…The method can be readily implemented using time-domain terahertz (THz, 10 12 Hz) emission spectroscopy (TES) ( 9 , 10 ), in which the electric field waveform is directly recorded following excitation of the sample by an ultrashort optical pulse. The approach has been successfully applied to probe ultrafast electron dynamics in a variety of gaseous ( 11 ), liquid ( 12 ), and solid-state systems ( 13 – 15 ).…”

Section: Introductionmentioning

confidence: 99%

Recording interfacial currents on the subnanometer length and femtosecond time scale by terahertz emission

Yue

Güzeltürk

et al. 2019

Sci. Adv.

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“…Meanwhile, these CsPbX 3 are also outstanding frequency up‐conversion emitters with low threshold of multiphoton pumped stimulated emission, large penetration depth, less damage threshold, and high spatial resolution, which make them significant in potential nonlinear optoelectronic applications such as two‐photon or multiphoton microscopy and spectroscopy . Recently, fundamental research of the perovskites has been focused on the exploration of the photophysical properties such as carrier dynamics and lasing mechanisms in both linear and nonlinear optical regime, to promote the development of perovskite‐based photovoltaic and optoelectronic devices. Compared to the linear optical effects, the high‐order nonlinear optical effects in inorganic perovskites are relatively less explored but important from the fundamental physics point of view as they reveal intrinsic symmetry of the new materials.…”

Section: Introductionmentioning

confidence: 99%

“…Compared to the other photocurrent electrical detection with electrodes, THz emission spectroscopy is a nondestructive way with more information such as polarization, amplitude, phase, and polarity . THz emission spectroscopy has been used for the photophysical understanding of some advanced materials such as layered materials MoS 2 , WS 2 , WSe 2 , CH 3 NH 3 PbI 3 , and topological insulator . However, these is no evidence yet of high‐order shift current by TPA process involved in THz emission possibly due to low TPA cross‐sections in these materials.…”

Section: Introductionmentioning

confidence: 99%

High‐Order Shift Current Induced Terahertz Emission from Inorganic Cesium Bromine Lead Perovskite Engendered by Two‐Photon Absorption

Huang

et al. 2019

Adv Funct Materials

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High-order nonlinear optical phenomena are interesting from a fundamental point of view as they reveal intrinsic symmetries of the materials. Potentially they can also be used for practical optoelectronic applications. High-order shift current is one of these phenomena, and yet it has never been detected in experiments, primarily due to the difficulty in conventional contact detection. In this work, the shift current due to the two-photon absorption (TPA) from all-inorganic perovskite CsPbBr 3 is first observed by a contactless and nondestructive terahertz (THz) emission method. The results reveal that the THz emission is dominated by a high-order shift current (fourth-order nonlinear optical effect) with the below-bandgap photon energy of femtosecond laser excitation. The high-order shift current origins from the broken inversion symmetry induced by the dynamic stereochemical activity of the Pb 2+ lone pair. A microscopic TPA-assisted nonlinear optical model is presented to describe the photophysical process of the THz emission. The model matches well with the quadratic pump fluence and angular dependence of the THz emission. This work can not only open a new venue for the all-inorganic perovskite-based nonlinear optoelectronics and THz devices, but also afford a THz technology for the high-order nonlinear effect analysis.

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Terahertz surface emission of d -band electrons from a layered tungsten disulfide crystal by the surface field

Cited by 46 publications

References 42 publications

Nonlinear Optics with 2D Layered Materials

Nonlinear Optics with 2D Layered Materials

Recording interfacial currents on the subnanometer length and femtosecond time scale by terahertz emission

High‐Order Shift Current Induced Terahertz Emission from Inorganic Cesium Bromine Lead Perovskite Engendered by Two‐Photon Absorption

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