Wen-Bo Shi's research while affiliated with Nanjing University and other places
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Publications (11)
We investigate circularly polarized photoluminescence (PL) in the MoS2/MoO3 heterostructure, which was fabricated by transferring MoS2 monolayer to cover the MoO3 few layers on the SiO2/Si substrate. It is shown that the PL with the same helicity as the excitation light is dominant due to the inherent chiral optical selectivity, which allows exciti...
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The hybrid organic-inorganic perovskites (HOIPs) have attracted much attention recently due to their preeminent efficiency in solar cells. According to the difference on the crystalline structure, the HOIPs could be classified into layered and non-layered perovskites. Very recently, it has been realized that the non-layered HOIPs with common-vertex...
The efficiency of photoluminescence (PL) of transition-metal dichalcogenides (TMDCs) significantly influences their practical applications in optoelectronic devices. In this work, we study multiple coupling among excitons, surface plasmons, and optical modes, and their effects on PL of monolayer MoS 2 atop plasmonic nanohole arrays. Under the illum...
In this work, we experimentally demonstrate for the first time strong localization of surface plasmon polaritons (SPPs) at visible regime in metallic nanogratings with short-range correlated disorder. By increasing the degree of disorder, the confinement of SPPs is significantly enhanced, and the effective SPP propagation length dramatically shrink...
In this work, we demonstrate broadband integrated polarization rotator (IPR) with a series of three-layer rotating metallic grating structures. This transmissive optical IPR can conveniently rotate the polarization of linearly polarized light to any desired directions at different spatial locations with high conversion efficiency, which is nearly c...
In this work, we demonstrate polarization-dependent strong coupling between surface plasmon polaritons (SPPs) and excitons in the J -aggregates-attached aperture array. It is shown that the excitons strongly couple with the polarization-dependent SPPs, and Rabi splittings are consequently observed. As a result, the polarization-dependent polariton...
In this work, we present in-plane propagation of surface plasmon polaritons (SPPs) guided by a single dielectric (Al2O3) subwavelength lens. By mounting a designed Al2O3 nanoparticle on the silver film, the effective index of a silver-Al2O3 interface is influenced by the particle thickness, then the phase difference between the silver-air and silve...
In this Letter, we present hybrid strong coupling between multiple photonic modes and excitons in an organic-dye-attached photonic quasicrystal. The excitons effectively interact with the photonic modes offered by the photonic quasicrystal, and multiple hybrid polariton bands are demonstrated in both experiments and calculations. Furthermore, by re...
In this work, we demonstrate experimentally the hybrid coupling among molecular excitons, surface plasmon polaritons (SPPs), and Fabry-Perot (FP) mode in a nanostructured cavity, where a J-aggregates doped PVA (polyvinyl alcohol) layer is inserted between a silvergrating and a thick silver film. By tuning the thickness of the doped PVA layer, the F...
In this work, we demonstrate the high optical absorption efficiency of a thin-film silicon solar cell. In thin-film solar cells, the efficiency is strongly dependent on light trapping by structures capable of exciting different resonance modes. Here, we consider a trapezoidal surface design that not only reduces reflection with a gradient index of...
Citations
... C K = C K ′ = 1/2 for B = 0.39 T and C K = C K ′ = -1/2 for B = -0.39 T. When we combine two topological phases together, a zero or non-zero integer topological invariance can be obtained for the heterojunction: |∆C| = |C K,K ′ u − C K,K ′ d |, here C K, K ′ u and C K, K ′ d are the valley Chern numbers contributed by the two phases, respectively [40][41][42][43]. The number of topological channels is determined by the absolute value of ∆C, whereas the sign of ∆C defines the transmission direction of topological edge states. ...
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... 3 . To understand the photoinduced recombination mechanism in the CsPbBr 3 NCs, we measure the PL spectra at various excitation laser powers at room temperature as illustrated in Figures 4(e) and 4(f ) [56]. Te excitation power of the incoming light ranges from 100 to 500 mW. ...
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... TMDs have been demonstrated as a versatile platform to manipulate the excitonic emissions with different DOFs when coupled with various photonic nanostructures. In optical cavities, the bright excitonic emission intensities could be significantly amplified with accelerated dynamics by the Purcell effect and even get into the stimulated regime for coherent lasing actions [23][24][25][26] . Remarkably, these bright excitons could also reach the strong coupling regime by controlling the coupling strength, giving rise to intriguing polaritonic phenomena [27][28][29][30][31][32][33][34][35] . ...
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... The recent advancements in the study of quantum gases of ultracold atoms trapped in optical lattices [32][33][34] have sparked a growing interest in the localization transition and the potential existence of mobility edges in quasiperiodic systems, leading to their experimental detections [23,[35][36][37]. Despite extensive studies on Anderson localization transition across a plethora of domains such as electronics [38][39][40], photonics [41][42][43], and acoustics [44][45][46], explorations for this phenomenon in plasmonic systems remain limited owing to the intrinsic field leakage [47]. ...
... The principle is that metasurfaces consisting of subwavelength metamolecules that interact strongly with THz waves result in unprecedented capabilities in efficient polarization controls [10,14,15]. Examples include in THz astronomy, metasurfaces consisting of metal gratings have been used for polarization-selections [16][17][18]. Incident waves with polarization that parallel to the metal grating are reflected, while the perpendicular polarization is transmitted. One of the biggest drivers for the research polarization control is the application of THz sensors [19][20][21][22][23][24]. ...
... This is because, as previously demonstrated [69], TM-polarized modes are far from resonance with the WS 2 exciton. However, due to the large thickness of the perovskite, the TM-polarized modes can still resonate with its exciton, resulting in the observation of the strong coupling [70]. ...
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... As a consequence, a variety of different methods of light guiding and focusing were realized in e.g. metamaterials [3][4][5] , surface plasmon-polaritons [6][7][8][9] , phase-change materials 10 , and photonic crystals 11,12 . However, a shortcoming of many optical devices is their weak Kerr nonlinear response. ...
... Since many physical properties of polaritons are associated with Hopfield coefficients, such as the amplitude, full width at halfmaximum (FWHM), 48 optical Stark effect, 3,11 the Hopfield coefficients should be determined. Based on the experimental and fitting results, we retrieve the Hopfield coefficients a LSP j j 2 and a IVM j j 2 in each vibropolariton mode, as shown in Figs. ...
... To reveal the underlying mechanism behind the three-mode coupled system, we use the coupled oscillator model to analyze the hybrid states [36][37][38]. And this system can be modeled as follows: where E cav , E c , and E x refer to the resonant energies of the cavity, chiral object, and WSe 2 , respectively. ...
... 16,17 The light absorption enhancement is significantly determined by the parameters of the plasmonic arrays including materials, shapes, sizes, and coverages. [35][36][37][38][39][40][41][42][43] When the plasmonic light-trapping strategy can be applied in ultrathin solar cells, the absorption enhancement has been proved to effectively compensate for the loss from the ultrathin photoactive layer. 17 On the other hand, anti-reflection (AR) coatings are also commonly used to enhance the optical absorption of solar cells. ...
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