Complex electrical permittivity of the monolayer molybdenum disulfide (MoS_2) in near UV and visible

Mukherjee, Bablu; Tseng, Frank; Gunlycke, Daniel; Amara, Kiran Kumar; Eda, Goki; Şimşek, Ergün

doi:10.1364/ome.5.000447

Cited by 110 publications

(96 citation statements)

References 23 publications

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“…14 that the effect of the resonance enhancement on SHG signal efficiency in MoS 2 is approximately one order of magnitude. When the resonance enhancement and the incident light intensity are fully considered, and using previously measured nonlinear material parameters303132, we estimate that the experimental THG/SHG intensity ratio in our experiments with an incident beam power of 10 mW (fluence of around 8 mJ cm −2 ) at 1,560 nm should be on the order of 2 × 10 −3 . This intensity ratio is proportional to the incident beam power, but even for a considerably higher incident beam power of 100 mW (fluence of 80 mJ cm −2 ) the calculated ratio is only around 2 × 10 −2 .…”

Section: Resultsmentioning

confidence: 87%

“…The effect of resonance enhancement can be approximated with the classical anharmonic oscillator model30, as the nonlinear susceptibilities are proportional to the linear susceptibilities both at the fundamental and harmonic frequencies. The absolute value of the permittivity of MoS 2 at 520 nm is ∼1.8 times larger than that at 780 nm3132. Therefore, using the anharmonic oscillator model one indeed expects the near-resonance THG susceptibility at 520 nm to be ∼1.8-fold enhanced compared with off-resonant THG susceptibility at 780 nm.…”

Section: Resultsmentioning

confidence: 94%

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Rapid visualization of grain boundaries in monolayer MoS2 by multiphoton microscopy

et al. 2017

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Grain boundaries have a major effect on the physical properties of two-dimensional layered materials. Therefore, it is important to develop simple, fast and sensitive characterization methods to visualize grain boundaries. Conventional Raman and photoluminescence methods have been used for detecting grain boundaries; however, these techniques are better suited for detection of grain boundaries with a large crystal axis rotation between neighbouring grains. Here we show rapid visualization of grain boundaries in chemical vapour deposited monolayer MoS2 samples with multiphoton microscopy. In contrast to Raman and photoluminescence imaging, third-harmonic generation microscopy provides excellent sensitivity and high speed for grain boundary visualization regardless of the degree of crystal axis rotation. We find that the contrast associated with grain boundaries in the third-harmonic imaging is considerably enhanced by the solvents commonly used in the transfer process of two-dimensional materials. Our results demonstrate that multiphoton imaging can be used for fast and sensitive characterization of two-dimensional materials.

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Section: Resultsmentioning

confidence: 87%

Section: Resultsmentioning

confidence: 94%

Rapid visualization of grain boundaries in monolayer MoS2 by multiphoton microscopy

et al. 2017

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“…[38], and the dispersion curve of the monolayer MoS 2 was obtained from Ref. [39]. The fitted dispersion curves of TiN and monolayer MoS 2 are exhibited in Fig.…”

Section: Methodsmentioning

confidence: 99%

Broadband Perfect Absorber with Monolayer MoS2 and Hexagonal Titanium Nitride Nano-disk Array

et al. 2017

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A broadband metamaterial absorber (MA) composed of hexagonal-arranged single-sized titanium nitride (TiN) nano-disk array and monolayer molybdenum disulfide (MoS2) is studied using finite-difference time-domain (FDTD) simulations. The structure of TiN nano-disk array/dielectric silica (SiO2)/aluminum (Al) is adopted in our design. By optimizing the dimension parameters of the structure, an average absorption of 96.1% is achieved from 400 to 850 nm. In addition, by inserting a monolayer MoS2 which has high absorption at the short wavelength side underneath the TiN nano-disk array, an average absorption of 98.1% over the entire visible regime from 400 to 850 nm was achieved, with a peak absorption near 100% and absorption over 99% from 475 to 772 nm. Moreover, the absorber presented in this paper is polarization insensitive. This compact and unique design with TiN nano-disk/monolayer MoS2/ SiO2/Al structure may have great potential for applications in photovoltaics and light trapping.

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“…In particular, a complete knowledge of the frequency dependence of the linear and nonlinear optical constants is a prerequisite for a rigorous computational description of the optical response of these materials. Theoretical calculations [29,37,57,58] and experimental investigations [28,59,60] are beginning to fill in this gap, a summary of the results of these studies being briefly outlined in this section.…”

Section: Linear and Nonlinear Optical Properties Of 2d Materialsmentioning

confidence: 99%

Theoretical and computational analysis of second- and third-harmonic generation in periodically patterned graphene and transition-metal dichalcogenide monolayers

Weismann

Panoiu

2016

Phys. Rev. B

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Remarkable optical and electrical properties of two-dimensional (2D) materials, such as graphene and transition-metal dichalcogenide (TMDC) monolayers, offer vast technological potential for novel and improved optoelectronic nanodevices, many of which rely on nonlinear optical effects in these 2D materials. This paper introduces a highly effective numerical method for efficient and accurate description of linear and nonlinear optical effects in nanostructured 2D materials embedded in periodic photonic structures containing regular three-dimensional (3D) optical materials, such as diffraction gratings and periodic metamaterials. The proposed method builds upon the rigorous coupled-wave analysis and incorporates the nonlinear optical response of 2D materials by means of modified electromagnetic boundary conditions. This allows one to reduce the mathematical framework of the numerical method to an inhomogeneous scattering matrix formalism, which makes it more accurate and efficient than previously used approaches. An overview of linear and nonlinear optical properties of graphene and TMDC monolayers is given and the various features of the corresponding optical spectra are explored numerically and discussed. To illustrate the versatility of our numerical method, we use it to investigate the linear and nonlinear multiresonant optical response of 2D-3D heteromaterials for enhanced and tunable second-and third-harmonic generation. In particular, by employing a structured 2D material optically coupled to a patterned slab waveguide, we study the interplay between geometric resonances associated to guiding modes of periodically patterned slab waveguides and plasmon or exciton resonances of 2D materials.

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Complex electrical permittivity of the monolayer molybdenum disulfide (MoS_2) in near UV and visible

Cited by 110 publications

References 23 publications

Rapid visualization of grain boundaries in monolayer MoS2 by multiphoton microscopy

Rapid visualization of grain boundaries in monolayer MoS2 by multiphoton microscopy

Broadband Perfect Absorber with Monolayer MoS2 and Hexagonal Titanium Nitride Nano-disk Array

Theoretical and computational analysis of second- and third-harmonic generation in periodically patterned graphene and transition-metal dichalcogenide monolayers

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