Transition metal dichalcogenide metaphotonic and self-coupled polaritonic platform grown by chemical vapor deposition

Abstract

Transition metal dichalcogenides (TMDCs) have recently attracted growing attention in the fields of dielectric nanophotonics because of their high refractive index and excitonic resonances. Despite the recent realizations of Mie resonances by patterning exfoliated TMDC flakes, it is still challenging to achieve large-scale TMDC-based photonic structures with a controllable thickness. Here, we report a bulk MoS2 metaphotonic platform realized by a chemical vapor deposition (CVD) bottom-up method, supporting both pronounced dielectric optical modes and self-coupled polaritons. Magnetic surface lattice resonances (M-SLRs) and their energy-momentum dispersions are demonstrated in 1D MoS2 gratings. Anticrossing behaviors with Rabi splitting up to 170 meV are observed when the M-SLRs are hybridized with the excitons in multilayer MoS2. In addition, distinct Mie modes and anapole-exciton polaritons are also experimentally demonstrated in 2D MoS2 disk arrays. We believe that the CVD bottom-up method would open up many possibilities to achieve large-scale TMDC-based photonic devices and enrich the toolbox of engineering exciton-photon interactions in TMDCs.

Tunable Kerker Scattering in a Self‐Coupled Polaritonic Metasurface

“…[53,54,55] As an experimental demonstration, we consider a MoS 2 metasurface with constituent nanodisks arranged in a lattice. As schematically shown in Figure 2a, disk arrays were transferred to the glass substrate after the fabrication process (more details about the fabrication process can be seen in our previous work [56] ). Then, to embed the metasurface in a homogeneous environment, a sequence of poly methyl methacrylate (PMMA, ≈200 nm) and polydimethylsiloxane (PDMS, 0.2 mm) layers were covered on the top.…”

“…First, as Figure 2b schematically shows, bulk MoS 2 of large refractive index ($$n > 4$$) along with room‐temperature (RT) excitons, is of particular advances to support highly resonant Mie modes with self‐coupled polaritons. [ 46,56,57,58 ] In addition, the nanodisk is much less experimentally demanding than the nanosphere in terms of the nanofabrication process. The electric and magnetic responses supported in a nanodisk can be adjusted with a suitable choice of disk height h and diameter d (Figure 2b).…”

Exciton Polaritons in Emergent Two-Dimensional Semiconductors

“…There emerge distinct excitons in two-dimensional (2D) semiconductors that cannot simply be understood by the above-mentioned models of Wannier–Mott excitons and Frenkel excitons. ,,− On the one hand, 2D excitons possess large oscillator strength and strong binding energy ,,,− ,− which are comparable with Frenkel excitons, due to the quantum confinements and dielectric screening. On the other hand, the electron–hole pairs are not so localized that they span over several crystalline lattice sites, which are still in the framework of the Wannier–Mott exciton model but with some modification. ,,,− ,− These attrctive properties of 2D excitons present numerous exciting opportunities to investigate fascinating light-matter interactions, supporting fantastic avenues for investigating the exciton polaritons for fundamental quantum research and optoelectronic applications. ,,,− Typical semiconductor examples for 2D excitons are van der Waals semiconductors, including monolayer transition metal dichalcogenides (TMDs), 2D perovskites (2DPKs), and 2D antiferromagnetic (AFM) semiconductors, which will be discussed in more detail later.…”

In situgeneration of a Ti3C2Tx(Tx= F, O and OH) MXene decorated CuO nanocomposite with extraordinary catalytic activity for TKX-50 thermal decomposition

“…[1][2][3][4] For instance, twodimensional carbon materials and transition metal dihalogenated compounds (TMDCs), have gradually become the main choices for electrode materials in spectral devices, chemical catalysts and other fields due to their high specific surface area and good electrical and thermal conductivity. [5][6][7][8] Recently, Yuri et al developed a novel multi-functional two-dimensional material MXene. 9 MXenes are composed of transition metal and carbide nitride, mainly obtained from the etching layer A of the MAX phase material (M is the early transition metal, A is the active Al group element, and X is C or N).…”