Unconventional electroabsorption in monolayer MoS ₂

Abstract

Signal modulation in optoelectronics is obtained by modulation of either the refractive index or the absorbance by an electric field. However, electromodulators have not kept up with the miniaturization of other electronic and optical components. Here we show a strong transverse electroabsorption signal in a monolayer of the 2D semiconductor MoS2. The electroabsorption spectrum is dominated by an apparent linewidth broadening of around 15% at a modulated voltage of only Vpp = 0.5 V. Contrary to known variants of the Stark effect, the broadening increases linearly with the applied field strength and arises from a linear variation of the distance between the strongly overlapping exciton and trion resonances. The achievable modulation depths exceeding 0.1 dB nm−1 bear the scope for extremely compact, ultrafast, energy-efficient electroabsorption modulators for integrated photonics, including on-chip optical communication.

Thermal Light Emission from Monolayer MoS2

“…However, as depicted in the inset in Figure d, we do not find any appreciable dependence on V BG . Alternatively, the lateral electric field over the trench may induce a Stark‐shift, but previous work suggests that the shift would be almost two orders of magnitude smaller than that observed in our experiment . Instead, the shift can mostly be attributed to lattice heating.…”

Measurements of electrically tunable refractive index of MoS2 monolayer and its usage in optical modulators

“…This modulation depth observed in our device is among the best for TMDs based modulators. [4][5][6]37 The changes observed in Fig. 4c, d are attributed to the V g induced refractive index changes (Fig.…”

“…[1][2][3] As a result, 2D atomic semiconductor crystals emerged as a potential alternative to bulk semiconductors for optoelectronic applications compatible with CMOS technology. [4][5][6] The most investigated 2D semiconductor-a molybdenum disulphide (MoS 2 ) monolayer-deserves special attention as it hosts a high quality electronic system with a unique band structure and a technologically favourable band gap. [7][8][9] A MoS 2 monolayer is a direct band semiconductor with E g ≈ 1.9 eV and is composed of hexagonal planes of S and Mo atoms glued together by ionic-covalent interactions in a trigonal prismatic arrangement.…”

Solvent exfoliation stabilizes TiS2 nanosheets against oxidation, facilitating lithium storage applications

“…[4][5][6][7][8][9] Although graphene 10,11 is undoubtedly the most well-known and widely used 2D material, many others exist, with transition metal dichalcogenides (TMDs) being probably the most known family of inorganic 2D materials. 12 TMDs such as MoS 2 and WS 2 have been thoroughly studied over the last few years, performing well in a wide range of applications including battery electrodes, 13 light modulators 14 and multibit memory. 15 However, not all TMDs are so well-known.…”