Gate-Tunable Emission of Exciton−Plasmon Polaritons in Hybrid MoS 2 -Gap-Mode Metasurfaces Downloaded via UNIV OF SOUTHERN INDIANA on - Archive ouverte HAL Access content directly
Journal Articles ACS photonics Year : 2019

Gate-Tunable Emission of Exciton−Plasmon Polaritons in Hybrid MoS 2 -Gap-Mode Metasurfaces Downloaded via UNIV OF SOUTHERN INDIANA on

Abstract

The advance in designing arrays of ultrathin two-dimensional optical nanoresonators, known as metasurfaces, is currently enabling a large variety of novel flat optical components. The remarkable control over the electromagnetic fields offered by this technology can be further extended to the active regime in order to manipulate the light characteristics in real-time. In this contribution, we couple the excitonic resonance of atomic thin MoS 2 monolayers with gap-surface-plasmon (GSP) metasurfaces, and demonstrate selective enhancement of the exciton−plasmon polariton emissions. We further demonstrate tunable emissions by controlling the charge density at the interface through electrically gating in the Metal-Oxide-Semiconductor (MOS) structure. Straddling two very active fields of research, this demonstration of electrically tunable light-emitting metasurfaces enables real-time manipulation of light−matter interactions at the extreme subwavelength dimensions. T wo-dimensional (2D) materials featuring exceptional optical and optoelectronic properties have attracted increasing interest with significant potential to develop a great number of emerging nano-optoelectronics devices. 1−4 In particular, 2D materials host a larger variety of polaritons compared with conventional three-dimensional (3D) semiconductors , such as plasmon polaritons in graphene, 5,6 phonon polaritons in hexagonal boron nitride (hBN). 7,8 Moreover, the current "polaritonic library" of 2D materials has been greatly expanded by the wide observation of exciton polaritons from the recent emerging atomically thin semiconductors, such as molybdenum and tungsten-based transition metal dichalcoge-nides (TMDCs). 9−11 Exciton polaritons are new quasi-particles of light−matter hybrid states, which both have the advantages of photons, such as ultrafast speed, long-range spatial/temporal coherence, and exhibit strong light matter interactions. Their unique half-light half-matter characteristics make them indispensable platform to both explore fundamental research such as polariton Bose−Einstein condensation, 12,13 polariton bistability, 14−16 and propose new types of polaritonic devices like polariton lasers, 12,17 switches, 18 transistors, 14 and logic gates. 15,16 Among TMDCs, monolayer molybdenum disulfide (MoS 2) has been one of the most widely studied. Various excitons and other types of exciton complexes such as trions and biexcitons can be readily observed and manipulated even at room temperature in MoS 2 monolayer due to its large exciton binding energies that, together with its direct electronic band structure, make it a unique system to investigate polaritonic phenomena. 19−22 Over the past 50 years, the field of plasmonic has received considerable attention, in particular due to its extraordinary capability of confining light below the diffraction limit. Recently, exciton−plasmon coupling has been extensively observed from a large variety of hybrid 2D material plasmonic systems, including metallic nanoparticle arrays, nanoslits and nanolattice. 23−26 Such coupling offers an additional degree of freedom to tailor the optical properties of 2D materials, such as quantum efficiency enhancement, polarization control, and so forth. Moreover, the feasibility of controlling of the exciton−

Dates and versions

hal-02413419 , version 1 (16-12-2019)

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Peinan Ni, Andres de Luna Bugallo, Victor M Arellano Arreola, Mario Flores Salazar, Élodie Strupiechonski, et al.. Gate-Tunable Emission of Exciton−Plasmon Polaritons in Hybrid MoS 2 -Gap-Mode Metasurfaces Downloaded via UNIV OF SOUTHERN INDIANA on. ACS photonics, 2019, 6, pp.1594 - 1601. ⟨10.1021/acsphotonics.9b00433⟩. ⟨hal-02413419⟩
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