Mingsong Wang

CUNY Advanced Science Research Center

Two-dimensional exciton-polaritons in monolayer transition metal dichalcogenides (TMDs) exhibit practical advantages in valley coherence, optical nonlinearities, and even bosonic condensation owing to their light-emission capability. To achieve robust exciton-polariton emission, strong photon-exciton couplings are required at the TMD monolayer, whi...

The topological features of optical vortices have been opening opportunities for free-space and on-chip photonic technologies, e.g., for multiplexed optical communications and robust information transport. In a parallel but disjoint effort, polar anisotropic van der Waals nanomaterials supporting hyperbolic phonon polaritons (HP ² s) have been leve...

Two-dimensional (2D) exciton-polaritons in monolayer transition metal dichalcogenides (TMDs) exhibit practical advantages in valley coherence, optical nonlinearities, and even bosonic condensation owing to their light emission capability. To achieve robust exciton-polariton emission, strong photon-exciton couplings are required at the TMD monolayer...

Exciton Linewidth Due to strong multiparticle interactions in 2D transition metal dichalcogenides at room temperature, their homogeneous exciton linewidths are significantly broadened, degrading the quality of their excitonic mode and emission. In article number 2108721, Yuebing Zheng and co‐workers achieve near‐intrinsic exciton linewidth in monol...

The homogeneous exciton linewidth, which captures the coherent quantum dynamics of an excitonic state, is a vital parameter in exploring light‐matter interactions in two‐dimensional transition metal dichalcogenides (TMDs). An efficient control of the exciton linewidth is of great significance, and in particular of its intrinsic linewidth, which det...

In article number 2100050, Yuebing Zheng and co‐workers review the progress in developments and applications of plasmonic nanotweezers and nanosensors where the plasmon‐enhanced light–matter interactions at the nanoscale improve the optical manipulation and analysis of biological objects. In the context of plasmofluidics, which merges plasmonics an...

In article number 2007236, Mingsong Wang, Andrea Alù, Yuebing Zheng, and co‐workers report the achievement of directivity modulation of exciton excitation and emission of 2D transition metal dichalcogenides with single silicon nanospheres. A modified Mie theory is derived to guide the optimal design of the 2D‐nanosphere hybrids for ultracompact act...

In article number 2004376 Andrea Alù, Alexander B. Khanikaev, and co‐workers apply a near‐field technique to investigate a higher‐order topological photonic metasurface. They show that the near‐field profiles reveal the topological nature of the optical modes (depicted as a torus). Topology manifests in the displacement of the Wannier center, givin...

The capabilities of manipulating and analyzing biological cells, bacteria, viruses, deoxyribonucleic acids (DNAs), and proteins at high resolution are significant in understanding biology and enabling early disease diagnosis. The progress in developments and applications of plasmonic nanotweezers and nanosensors is discussed, where the plasmon‐enha...

Coupling emitters with nanoresonators is an effective strategy to control light emission at the subwavelength scale with high efficiency. Low‐loss dielectric nanoantennas hold particular promise for this purpose, owing to their strong Mie resonances. Herein, a highly miniaturized platform is explored for the control of emission based on individual...

Higher‐order topological insulators (HOTIs) represent a new type of topological system, supporting boundary states localized over boundaries, two or more dimensions lower than the dimensionality of the system itself. Interestingly, photonic HOTIs can possess a richer physics than their original condensed matter counterpart, supporting conventional...

Optical metasurfaces are assemblies of subwavelength, artificially designed inclusions forming planarized devices with unprecedented capabilities to manipulate electromagnetic waves and facilitate multiple functionalities. Recent topical efforts in this research area have been focused on pushing forward the frontiers of enhanced light–matter intera...

Subwavelength nanostructures with tunable compositions and geometries show favorable optical functionalities for the implementation of nanophotonic systems. Precise and versatile control of structural configurations on solid substrates is essential for their applications in on-chip devices. Here, we report all-solid-phase reconfigurable chiral nano...

All-dielectric nanostructures have recently opened exciting opportunities for functional nanophotonics, owing to their strong optical resonances along with low material loss in the near-infrared range. Pushing these concepts to the visible range is hindered by their larger absorption coefficient, thus encouraging the search for alternative dielectr...

Coupling emitters with nanoresonators is an effective strategy to control light emission at the subwavelength scale with high efficiency. Low-loss dielectric nanoantennas hold particular promise for this purpose, owing to their strong Mie resonances. Herein, we explore a highly miniaturized platform for the control of emission based on individual s...

Monolayer WS2 emission is limited by its poor emission directivity. We introduce single hydrogenated amorphous silicon nanospheres (a-Si: H NSs) to realize on-demand directivity modulation. We demonstrate the active control of forward-to-backward modulation ratio via tuning the radius of a-Si: H NSs.

We derive a universal multipolar model for dipole-sphere hybrids, introduce single subwavelength silicon nanospheres at visible wavelengths with facile size control, and demonstrate controllable directional excitation and emission of nanoemitters (e.g. WS2, MoS2) for on-demand emission property modulations.

Constructing colloidal particles into functional nanostructures, materials, and devices is a promising yet challenging direction. Many optical techniques have been developed to trap, manipulate, assemble, and print colloidal particles from aqueous solutions into desired configurations on solid substrates. However, these techniques operated in liqui...

All-dielectric nanoantennas have recently opened exciting opportunities for functional nanophotonics, owing to their strong optical resonances along with low material loss in the near-infrared range. Pushing these concepts to the visible range is hindered by a larger absorption coefficient of Si and other high-index semiconductors, thus encouraging...

In article number 1900982, Yuebing Zheng and co‐workers demonstrate that the coupling between out‐of‐plane localized surface plasmon resonances and dark K‐K excitons in monolayer WS2 leads to narrow Fano resonances in the hybrid systems consisting of stacked gold nanotriangles and monolayer WS2.

Strong spatial confinement and highly reduced dielectric screening provide monolayer transition metal dichalcogenides (TMDCs) with strong many-body effects, thereby possessing optically forbidden excitonic states (i.e., dark excitons) at room temperature. Herein, we explore the interaction of surface plasmons with dark excitons in hybrid systems co...

Strong spatial confinement and highly reduced dielectric screening provide monolayer transition metal dichalcogenides (TMDCs) with strong many-body effects, thereby possessing optically forbidden excitonic states (i.e., dark excitons) at room temperature. Herein, we explore the interaction of surface plasmons with dark excitons in hybrid systems co...

In article number 1705779, Alex Krasnok, Andrea Alú, Yuebing Zheng, and co‐workers demonstrate tunable Fano resonances that arise from the interactions between the excitons of monolayer WS2 and the localized surface plasmon resonances of single Au nanotriangles (AuNTs) at room temperature. The resonance tuning is realized by varying the dielectric...

Ultrathin active chiral metamaterials with dynamically tunable and responsive optical chirality enable new optical sensors, modulators and switches. Herein, we develop ultrathin active chiral metamaterials of highly tunable chiroptical responses by inducing tunable near-field coupling in the metamaterials, and exploit the metamaterials as ultrasens...

Tunable Fano resonances and plasmon–exciton coupling are demonstrated at room temperature in hybrid systems consisting of single plasmonic nanoparticles deposited on top of the transition metal dichalcogenide monolayers. By using single Au nanotriangles (AuNTs) on monolayer WS2 as model systems, Fano resonances are observed from the interference be...

Two-dimensional semiconducting transition metal dichalcogenides (TMDCs) are extremely attractive materials for optoelectronic applications in the visible and near-IR range. Here, we address for the first time to the best of our knowledge the issue of resonance coupling in hybrid exciton-polariton structures based on single Si nanoparticles coupl...

Optical manipulation of plasmonic nanoparticles provides opportunities for fundamental and technical innovation in nanophotonics. Optical heating arising from the photon-to-phonon conversion is considered as an intrinsic loss in metal nanoparticles, which limits their applications. We show here that this drawback can be turned into an advantage, by...

In article number 1701763, Yuebing Zheng and co-workers report how intersystem crossing (ISC) controls plasmon-enhanced fluorescence in hybrid systems of plasmonic nanostructures and spiropyran molecules. They further demonstrate An all-optical switching of the plasmon-enhanced fluorescence is demonstrated by irradiating the hybrid systems with alt...

By harnessing photoswitchable intersystem crossing (ISC) in spiropyran (SP) molecules, active control of plasmon-enhanced fluorescence in the hybrid systems of SP molecules and plasmonic nanostructures is achieved. Specifically, SP-derived merocyanine (MC) molecules formed by photochemical ring-opening reaction display efficient ISC due to their zw...

Resonance energy transfer (RET) from plasmonic metal nanoparticles (NPs) to two-dimensional (2D) materials enhances the performance of 2D optoelectronic devices and sensors. Herein, single-NP scattering spectroscopy is employed to investigate plasmon-trion and plasmon-exciton RET from single Au nanotriangles (AuNTs) to monolayer MoS2, at room tempe...

Rabi splitting that arises from strong plasmon-molecule coupling has attracted tremendous interests. However, it has remained elusive to integrate Rabi splitting into the hybrid plasmon-waveguide modes (HPWMs), which have advantages of both subwavelength light confinement of surface plasmons and long-range propagation of guided modes in dielectric...

Reversible assembly of plasmonic nanoparticles can be used to modulate their structural, electrical and optical properties. Common and versatile tools in nanoparticle manipulation and assembly are optical tweezers, but these require tightly focused and high-power (10-100 mW/µm²) laser beams with precise optical alignment, which significantly hinder...

We report molecular-fluorescence enhancement via the blue-shifted plasmon-induced resonance energy transfer (PIRET) from single Au nanorods (AuNRs) to merocyanine (MC) dye molecules. The blue-shifted PIRET occurs when there is a proper spectral overlap between the scattering of AuNRs and the absorption of MC molecules. Along with the quenching of s...

In article number 1500232, Y. B. Zheng and co-workers extend the scope of multi-photon plasmonic lithography to immobilize biomolecules. Protein hydrogels are precisely immobilized at the tips of a single gold nanotriangle. This process is tracked on single nanoparticles using dark-field scattering spectroscopy. These protein nano-anchors can serve...

Despite great success has been accomplished on the controlled synthesis of Pd nanocrystals with various sizes and morphologies, an efficient approach to systematic production of well-defined Pd nanocrystals without seed-mediated approaches remains a significant challenge. In this work, we have developed an efficient synthetic method to directly pro...

Supplementary

Selective localization of biomolecules at the hot spots of a plasmonic nanoparticle is an attractive strategy to exploit the light–matter interaction due to the high field concentration. Current approaches for hot spot targeting are time-consuming and involve prior knowledge of the hot spots. Multiphoton plasmonic lithography is employed to rapidly...

Plasmofluidics is the synergistic integration of plasmonics and micro/nanofluidics in devices and applications in order to enhance performance. There has been significant progress in the emerging field of plasmofluidics in recent years. By utilizing the capability of plasmonics to manipulate light at the nanoscale, combined with the unique optical...

We regioselectively localize protein hydrogels over the hot spots of single gold nanotriangle using MPPL, and track the immobilization using dark-field scattering spectroscopy. This technique can be exploited to study biological interactions in the nanoscale.

We report on lead-free piezoelectric composite with high dielectric constant (ε r > 105) and the d 33 (above 70 pC/N) comparable to typical lead based piezoelectric composites, or even higher, reaching as high as 107 pC/N. We achieved this through the combination of the good piezoelectric properties of the alkaline niobate (KNN) based perovskite wi...

We report the single-nanoparticle study of switchable exciton-plasmon coupling. The wavelength-dependent peak shifts in localized surface plasmon resonances (LSPRs) of metal nanoparticle-spiropyran hybrids depend on the combined effects of material dispersion and sensitivity of LSPRs.

The dielectric constant and electrical conductivity of a composite of two insulators, poly(1,1-difluoroethylene) (yellow) and K(2)CO(3) (white), increased dramatically near the percolation threshold f(c) (f=concentration of K(2)CO(3)). This intriguing phenomenon can be interpreted in terms of interface percolation caused by the formation of chemica...

A quantitative polarized Raman analysis of ferroelectric grain/domain orientation in LiSbO3 (LS-modified) (K0.5Na0.5)NbO3 (KNN) ceramics is presented, based on the analysis of the complex orientation dependence in space of their Raman-active modes. Complete sets of Raman tensor elements of Ag, and Eg phonon modes for orthorhombic/tetragonal structu...

Lead-free piezoelectric ceramics 0.98(KxNa1−x)NbO3–0.02BiScO3 (0.98KxN1−xN–0.02BS) (x=0.30–0.60) doped with 0.8mol% Mn were prepared by conventional solid-state sintering. The effects of K/Na ratio on the phase structure and electrical properties of the Mn doped 0.98KxN1−xN–0.02BS (0.98KxN1−xN–0.02BS–Mn) were mainly studied. It is experimentally de...

0.95Pb(Sc0.5Ta0.5)O3–0.05%PbTiO3 (PSTT5) thin films with and without a Pb(Zr0.52,Ti0.48)O3 (PZT52/48) seed layer were deposited on Pt/Ti/SiO2/Si(1 0 0) substrates by RF magnetron sputtering. X-ray diffraction patterns indicate that the PSTT5 film with a PZT52/48 seed layer exhibited nearly pure perovskite crystalline phase with highly (4 0 0)-prefe...

Lead-free piezoelectric ceramics (1-x)[(K0.5Na0.5)0.95Li0.05](Nb0.95Sb0.05)O3-xSrTiO3 (abbreviated as KNLNS-xST) were sintered by the conventional method. The effects of SrTiO3 content on the structure, the electrical properties and the temperature stability of ceramics were investigated. The X-ray diffraction patterns revealed that all the ceramic...

This paper presents a Raman spectroscopic study of compositional-change-induced structure variation and of the related mechanism of Mg doping in LiSbO3 (LS)-modified (K0.5Na0.5)NbO3 (KNN) ceramics. With increasing LS content from 0 to 0.06, a discontinuous shift towards higher wavenumbers was found for the band position of the A1g(v1) stretching mo...

Lead-free ceramics (1-x)(K0.48Na0.52)(Nb0.98Sb0.02)O3--xBiScO3 + 0.8 mol % MnCO3 have been fabricated by conventional sintering technique. The results of X-ray diffraction suggest that all samples show pure perovskite structure and the structure changes from orthorhombic to tetragonal with the increase of BiScO3. At room temperature, the polymorphi...

Lead-free ceramics (1-x)(K0.48Na0.52)(Nb0.98Sb0.02)O3?xBiScO3 + 0.8 mol % MnCO3 have been fabricated by conventional sintering technique. The results of X-ray diffraction suggest that all samples show pure perovskite structure and the structure changes from orthorhombic to tetragonal with the increase of BiScO3. At room temperature, the polymorphic...

CuO-doped 0.98K0.5Na0.5NbO3–0.02BiScO3 (0.98KNN–0.02BS–xCu) lead-free piezoelectric ceramics have been fabricated by ordinary sintering technique. The effects of CuO doping on the dielectric, piezoelectric, and ferroelectric properties of the ceramics were mainly investigated. X-ray diffraction reveals that the samples at doping levels of x≤0.01 po...

Pb(Zr0.8Ti0.2)O3 (PZT80/20) thin films were deposited on the Pt(111)/Ti/SiO2/Si(100) substrates by RF magnetron sputtering. Mainly perovskite crystalline phase with highly (202)-preferred orientation, determined by x-ray diffraction, was formed in the lead zirconate titanate (PZT)(80/20) thin films. Polarization measurements of the unannealed and a...

The BiScO3-modified (K0.475Na0.475Li0.05)(Nb0.95Sb0.05)O3 lead-free piezoelectric ceramics were prepared using normal sintering technique. The effects of the BiScO3 on the phase structure and electrical properties of the ceramics were systematically studied. These results show that the BiScO3-modified (K0.475Na0.475Li0.04)(Nb0.95Sb0.05)O3 lead-free...