New insights into APCVD grown monolayer MoS2 using time-domain terahertz spectroscopy

Abstract

In modern era, wireless communications at ultrafast speed are need of the hour and search for its solution through cutting edge sciences is a new perspective. To address this issue, the data rates in order of terabits per second (TBPS) could be a key step for the realization of emerging sixth generation (6G) networks utilizing terahertz (THz) frequency regime. In this context, new class of transition metal dichalcogenides (TMDs) have been introduced as potential candidates for future generation wireless THz technology. Herein, a strategy has been adopted to synthesize high-quality monolayer of molybdenum di-sulfide (MoS2) using indigenously developed atmospheric pressure chemical vapor deposition (APCVD) set-up. Further, the time-domain transmission and sheet conductivity were studied as well as a plausible mechanism of terahertz response for monolayer MoS2 has been proposed and compared with bulk MoS2. Hence, the obtained results set a stepping stone to employ the monolayer MoS2 as potential quantum materials benefitting the next generation terahertz communication devices.

Sensing Multiwall Carbon Nanotube Film Mediated by a Fano Resonant Terahertz Metasurface

“…However, pulse reshaping reflects modifications in metasurface properties due to the presence of the MWCNT layer, discussed later in detail. Further, the conventional FFT algorithm 46 is deployed to convert the temporal response into the frequency domain response as depicted in Figure 3d. Here, the solid and dashed lines denote experimental and numerically simulated results, respectively.…”

Computational Fluid Dynamics Insights into Chemical Vapor Deposition of Homogeneous MoS2 Film with Solid Precursors

“…The species model was opted to simulate the surface deposition of MoS 2 . A simplified reaction between MoO 3 and S was used as follow: [ 27 ] $$$$\begin{equation}\mathrm{2Mo{O}_3}\ \left( {\mathrm{g}} \right) + \mathrm{7S}\ \left( {\mathrm{g}} \right) \to \ \mathrm{2Mo{S}_{2}\ }\left( {\mathrm{s}} \right) + \ \mathrm{3S{O}_2}\ \left( {\mathrm{g}} \right)\end{equation}$$$$…”

“…First, a fine mesh was developed with ≈140 000 elements and ≈140 000 nodes for the simulation. A simplified reaction between MoO 3 and S was used as follow: [27] 2MoO 3…”

An ultra-broadband frequency-agile terahertz perfect absorber with perturbed MoS2 plasmon modes

“…22 The strong coupling absorption architecture based on molybdenum disulfide (MoS 2 ) is invaluable in comprehensive applications owing to its characteristics of ultrahigh surface atoms without dangling bonding, finite bandgap, picosecond photoconductive response, stabilized carrier mobility, and larger modulation depths. 23–26 However, effectively mitigating the amplitude attenuation during the absorption peak shifts remains a main challenge in expanding the absorption tuning range of such absorbers. 27…”

“…22 The strong coupling absorption architecture based on molybdenum disulfide (MoS 2 ) is invaluable in comprehensive applications owing to its characteristics of ultrahigh surface atoms without dangling bonding, finite bandgap, picosecond photoconductive response, stabilized carrier mobility, and larger modulation depths. [23][24][25][26] However, effectively mitigating the amplitude attenuation during the absorption peak shifts remains a main challenge in expanding the absorption tuning range of such absorbers. 27 Essentially, the perfect implementation of THz absorbers comes from completely compensating for the huge wavevector mismatch between the excited plasmons and free-space photons, 28 whether assisted by the controllable doping, sandwich-stacked configuration, or external photonic architecture.…”