Zhanghai Chen’s research while affiliated with Xiamen University and other places

... E xciton-polaritons, bosonic quasi-particles resulting from the strong coupling between excitons and cavity-confined photons, have continuously drawn lots of attention in recent decades. [1][2][3][4][5][6] As hybrid states of light and matter, exciton-polaritons show unique properties that are significantly different from those of pure photons and excitons. Due to their photonic component, exciton-polaritons exhibit impressive coherence in both time and spatial domains. ...

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Room temperature ballistic transport of exciton-polaritons in a one-dimensional whispering gallery microcavity

... This research uncovers new physical phenomena, such as quantum entanglement and chiral quantum light fields [11], while also offering practical implications for the advancement of cuttingedge optoelectronic devices and quantum information technologies. Chiral exciton-polaritons, for instance, hold potential for realizing all-optical switches [12]- [14], optical logic gates [15], novel quantum light sources [16], [17], and optical isolators [18], furthering advancements in quantum computing and communication. ...

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A general model for designing the chirality of exciton-polaritons

... Among TMD-based bilayer systems, MoSe 2 /WSe 2 vdW heterostructures exhibit excellent structural stability and minimal lattice mismatches, thus have been extensively addressed in the past decade [25][26][27][28][29]. For example, they can be prepared through the 'tear and stack' method, and the relative energy and coupling strength of dipole excitons can be regulated by small twist angle and an electric field [26]. ...

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Engineering the band structure of type-II MoSe2/WSe2 van der Waals heterostructure by electric field and twist angle: a first principles perspective

... Particularly for open microcavities, aligning both the cavity length and the relative orientation of the two mirrors can present a significant * Contact author: c.u.mattschas@utwente.nl challenge [22][23][24][25][26]. Useful methods for tackling this problem include deflection measurements (autocollimation) and interferometry. ...

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Inverse solving the Schrödinger equation for precision alignment of a microcavity

... This review not only aims to offer a broad overview of the current state of the TMD-based strong coupling but also attempts to inspire further investigations and developments of new polaritonic devices and technologies within van der Waals materials. For a detailed description of microcavity exciton-polariton physics and strong coupling with alternative promising materials, we refer the readers to some excellent reviews 5,23,50,51 . Here, we start with a brief introduction to TMD polaritons in various optical structures. ...

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Strong light-matter coupling in van der Waals materials

... Indeed, nonlinearities of polaritons governed by polaritonic interactions have become one of the most studied topics in the field of polariton physics. A variety of nonlinear phenomena, such as inter-and intra-band parametric scattering, 2,[8][9][10][11] polariton blockade, [12][13][14] topological edge mode, [15][16][17] and evaporative cooling 18) have been reported in recent years. Understanding and controlling the nonlinearities of polaritons is critical for both fundamental polariton physics and their potential optoelectronic applications. ...

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Room temperature ballistic transport of exciton-polaritons in a one-dimensional whispering gallery microcavity

... The underlying process can be revealed on the basis of a theoretical model using the Gross-Pitaevskii equation coupled to an incoherent exciton reservoir 37 . The simulation results are shown in Fig. 3g. ...

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All-optical temporal logic gates in localized exciton polaritons

... Indeed, nonlinearities of polaritons governed by polaritonic interactions have become one of the most studied topics in the field of polariton physics. A variety of nonlinear phenomena, such as inter-and intra-band parametric scattering, 2,[8][9][10][11] polariton blockade, [12][13][14] topological edge mode, [15][16][17] and evaporative cooling 18) have been reported in recent years. Understanding and controlling the nonlinearities of polaritons is critical for both fundamental polariton physics and their potential optoelectronic applications. ...

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Room temperature ballistic transport of exciton-polaritons in a one-dimensional whispering gallery microcavity

... However, there are some property differences even in the same type of material because of differences in the preparation method, sample treatment, etc. For instance, the two-photon absorption (TPA) coefficient of monolayer MoS 2 obtained by the mechanical exfoliation (ME) and chemical vapor deposition (CVD) method may differ by nearly two times, which can be ascribed to the large difference in the defect concentration between them [16]. The two-photon fluorescence of MoS 2 improved after treatment with bis-(trifluoromethane) sulfonimide as the defect density decreased during the defect repair process [17]. ...

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Microscopic optical nonlinearities and transient carrier dynamics in indium selenide nanosheet

... All these AlGaN based LEDs are using standing NW or NW arrays to improve the LEE, here we use surface plasmon resonance with plasmonic aluminum bowtie antenna array to enhance the LEE of AlGaN based LEDs with laid down NW structures. And our previous experimental work have demonstrated that the local surface plasmon resonance of Al bowtie antenna array can enhance the absorption, the emission and the second harmonic generation efficiency of ZnTe nanowire at the visible wavelength range [27][28][29]. ...

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Numerical investigation on the polarization-dependent light extraction of 275-nm AlGaN based nanowire with bowtie antenna array or passivation layer