Second-harmonic generation in molybdenum disulfide

Wagoner, G. A.; Persans, P. D.; Wagenen, E. A. Van; Korenowski, G. M.

doi:10.1364/josab.15.001017

Cited by 43 publications

(57 citation statements)

References 22 publications

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“…A femtosecond laser from an OPO with a broad wavelength range is usually utilized as the excitation and an analyzer is placed in front of the detector to resolve the angle‐dependent SHG signal. SHG of the bulk MoS 2 is very weak and χ (2) is around 10 −14 m/V; however, three groups simultaneously reported that SHG of monolayer MoS 2 , WS 2 , and WSe 2 increased dramatically . Later, numerous SHG studies were conducted on MoS 2 , WS 2 , WSe 2 , MoSe 2 , and MoTe 2 , and χ (2) was reported on the order of magnitude of 1 nm/V, which is much higher than the most used commercial nonlinear crystals (eg, χ (2) of BBO, KTP, and LiNbO 3 are on the order of magnitude of pm/V).…”

Section: Nlo Processes In Tmdsmentioning

confidence: 99%

Nonlinear optics of two‐dimensional transition metal dichalcogenides

Wen

Gong

2019

InfoMat

173

156

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Nonlinear optics (NLO) of transition metal dichalcogenides (TMDs) is promising for the on‐chip photonic and optoelectronic applications. In this review, we will survey the current progress of NLO in TMDs. First, we will brief the basic theory of the NLO in TMDs. Second, several important nonlinear processes in TMDs such as harmonic generation, four‐wave mixing, saturable absorption, and two‐photon absorption will be presented and their potential applications are also discussed. Third, the main strategies to tune, modulate, and enhance the NLO in TMDs are reviewed, including the excitonic effect, symmetry modulation, optical cavity enhancement, valley selection, edge state, and material phase. Finally, we give an outlook regarding some important issues and directions of NLO in TMDs.

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Section: Nlo Processes In Tmdsmentioning

confidence: 99%

Nonlinear optics of two‐dimensional transition metal dichalcogenides

Wen

Gong

2019

InfoMat

173

156

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“…The 2H phase of bulk TMDs such as MoS 2 crystals have a space group of D 6h with inversion symmetry. Consequently, the SHG response of these crystals vanishes, showing a SHG susceptibility at most of 10 −14 m V −1 in experiments . In contrast, the symmetry is broken to D 3h in a monolayer (Figure b,c) and allows valley‐selective optical interband transitions, as discussed in Section .…”

Section: The Optics Of 2d Tmdsmentioning

confidence: 83%

“…Consequently, the SHG response of these crystals vanishes, showing a SHG susceptibility at most of 10 −14 m V −1 in experiments. [ 70 ] In contrast, the symmetry is broken to D 3h in a monolayer (Figure 8 b,c) and allows valley-selective optical interband transitions, as discussed in Section 3.1. Attributed to the symmetry-breaking enhanced SHG phenomenon in monolayer 2D TMDs, e.g., MoS 2 , [ 71,72 ] and WS 2 can be found.…”

Section: Nonlinear Emission: Second Harmonic Generation (Shg)mentioning

confidence: 99%

Lighten the Olympia of the Flatland: Probing and Manipulating the Photonic Properties of 2D Transition‐Metal Dichalcogenides

Zhou

Zhang

2015

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Following the adventures of graphene, 2D transition metal dichalcogenides (TMDs) have recently seized part of the territory in the flatland. Branched by different components of metals and chalcogenides, the families of 2D TMDs have grown rapidly, in which the semiconductive ones have shown colorful photonic properties. By tuning the atomic components and reducing the thickness or planar size of the layers, one can manipulate the optical performance of 2D TMDs, e.g., the intensity, angular momentum, and frequency of the emitted light, or toward ultrafast nonlinear absorption. As a powerful optical method, the Raman characteristics of 2D TMDs have been successfully used to explore their lattices and electronic structures. Along with the maturing of 2D TMDs, their hybrids play an important role. The unique photonic properties of 2D van der Waals heterostructures and 2D alloys are introduced here. Apart from the group VI TMDs, future prospects are identified to harness the optical properties of other 2D TMDs and the related investigations of their hybrids are underway.

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“…Absorption and emission of MoS 2 occur in the visible spectrum. [11][12][13] Van der Waals bonding between adjacent S-Mo-S lattice planes forms multi-layer MoS 2 . An on/off electric current ratio of 10 8 in fi eld-effect transistors [ 9,10 ] and 10 2 -10 4 pm V −1 order nonlinear susceptibilities have been reported for MoS 2 .…”

Section: Introductionmentioning

confidence: 99%

“…An on/off electric current ratio of 10 8 in fi eld-effect transistors [ 9,10 ] and 10 2 -10 4 pm V −1 order nonlinear susceptibilities have been reported for MoS 2 . [11][12][13] Van der Waals bonding between adjacent S-Mo-S lattice planes forms multi-layer MoS 2 . [ 14 ] Plasmon-active metal nanoparticles augment local electric fi elds in MoS 2 , enhancing charge separation and transfer in fi eld-effect photodetectors, [15][16][17][18][19] photovoltaics, [20][21][22] and photocatalysts.…”

Section: Introductionmentioning

confidence: 99%

Spectral Characteristics of Noble Metal Nanoparticle–Molybdenum Disulfide Heterostructures

Forcherio

Roper

2016

Advanced Optical Materials

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near-fi elds and optical absorption [29][30][31] to improve light emission from MoS 2 despite plasmon-phonon coupling, [ 32 ] hot electron transport, [ 33 ] and recombination limitations. Gold (Au) nanoparticle-induced electric fi elds were reported to increase photoluminescence (PL) of MoS 2 1.7-to 2-fold [ 16,34 ] and tungsten disulfi de (WS 2 ) 10-fold. [ 35 ] In the latter, plasmon-exciton coupling had been maximized. Quenching of PL from MoS 2 by p-type doping was reported to result from smaller MoS 2 electron affi nity than the Au work function. [ 36 ] Development of compact models that attribute plasmon-phonon coupling and hot electron transport to heterostructure composition, geometry, and arrangement has, to date, lagged experimental characterization.This work introduced use of the discrete dipole approximation (DDA) to Maxwell's equations to characterize excitation and damping of plasmon and exciton modes in near-fi eld maps and far-fi eld transmission UV-vis spectra of MoS 2 decorated with Au nanospheres (AuNS) and silver nanoprisms (AgNP). DDA simulations of heterostructures exhibited features corresponding to localized surface plasmon resonance (LSPR) and to A and B exciton transitions of the semiconductor, and exhibited modulation of these features by a silica substrate. MoS 2 -induced red-shifts of LSPR wavelengths were estimated within 2% of measured spectra. Near-fi eld energy maps at the nanoparticle-MoS 2 interface showed nanoparticle plasmon energy dissipated to the MoS 2 via plasmon damping and direct bandgap excitation. Linewidth analysis of plasmon damping was used to characterize energy transfer, including putative hot electron transfer, enabled by excitation above the ca. 0.9 eV Schottky barrier [ 37 ] for Au-MoS 2 interfaces. Results indicate DDA simulation could guide design of plasmon-exciton interactions in nanoparticle-decorated transition metal dichalcogenides (TMD) beyond MoS 2 , based on an available measured or simulated dielectric function. Results and Discussion Sample Characterization and MethodsAuNS (76 ± 13 nm diameter) and AgNP (53 ± 19 nm edge length) were drop-cast [ 38 ] onto monolayer MoS 2 -covered silica glass and characterized using a bright-fi eld optical microscope (Eclipse LV100; Nikon Instruments, Melville, NY, USA) with Energy and damping of resonances which occur in spectra of monolayer molybdenum disulfi de (MoS 2 ) decorated by noble metal nanospheres and prisms are examined by comparing discrete dipole approximation (DDA) simulations and transmission UV-vis measurements. Localized surface plasmon resonance (LSPR) as well as A and B exciton transitions of the semiconductor are characterized individually and in tandem on a silica substrate. Extinction energies for LSPR and direct bandgap transition of MoS 2 estimated by DDA are within 2% of measured values for gold nanospheres and silver nanoprisms. Resonant near-fi elds mapped at nanoparticle-MoS 2 interfaces show plasmon damping via energy dissipation to the MoS 2 and direct bandgap excitation. Linewidth ana...

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Second-harmonic generation in molybdenum disulfide

Cited by 43 publications

References 22 publications

Nonlinear optics of two‐dimensional transition metal dichalcogenides

Nonlinear optics of two‐dimensional transition metal dichalcogenides

Lighten the Olympia of the Flatland: Probing and Manipulating the Photonic Properties of 2D Transition‐Metal Dichalcogenides

Spectral Characteristics of Noble Metal Nanoparticle–Molybdenum Disulfide Heterostructures

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