Second-harmonic generation enhancement in monolayer transition-metal dichalcogenides by using an epsilon-near-zero substrate

Vianna, Pilar G.; Almeida, Aline dos S.; Gerosa, Rodrigo M.; Bahamon, D. A.; Matos, Christiano J. S. de

doi:10.1039/d0na00779j

Cited by 18 publications

(16 citation statements)

References 67 publications

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“…In another study, Vianna et al. [ 255 ] showed one order of SHG enhancement in ultrathin WS 2 and MoS 2 on a Fluorine‐doped tin oxide (FTO) substrate. A FTO substrate shows a near zero epsilon at a 1550 nm laser excitation.…”

Section: Tuning Of Optical Harmonic Generation In 2d Layered Materialsmentioning

confidence: 99%

“…This enhancement is attributed to the reason that low refractive index unstructured substrates naturally enhances waves at the dielectric interface, which in turn enhances SHG response. [ 255 ] Franz et al. [ 261 ] found 35‐folds enhancement in SHG on multilayer MoS 2 coupled with a Si metasurface as compared to multilayer MoS 2 on SiO 2 .…”

Section: Tuning Of Optical Harmonic Generation In 2d Layered Materialsmentioning

confidence: 99%

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Optical Harmonic Generation in 2D Materials

Khan

Zhang

Ishfaq

et al. 2021

Adv Funct Materials

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2D materials are emerging as ideal candidates for fundamental investigations and new technologies due to their unique optoelectronic properties. Giant nonlinear susceptibility and perfect phase matching in 2D materials lead to extraordinary nonlinear light matter interactions, thus enabling several potential applications and fundamental scientific discoveries in nonlinear optics. For instance, second harmonic generation in 2D materials play an important role in optical devices such as, lasers, tunable waveguides, electro‐optic modulators, and switches. This review will discuss optical harmonic generation (OHG) processes, various characterization modes, and tuning techniques in 2D materials. The future prospectives for OHG in 2D materials is discussed. The extremely promising attributes of combining nonlinear optics and 2D materials is becoming a highly important multidisciplinary field.

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Section: Tuning Of Optical Harmonic Generation In 2d Layered Materialsmentioning

confidence: 99%

Section: Tuning Of Optical Harmonic Generation In 2d Layered Materialsmentioning

confidence: 99%

Optical Harmonic Generation in 2D Materials

Khan

Zhang

Ishfaq

et al. 2021

Adv Funct Materials

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“…Epsilon-near-zero (ENZ) materials have received considerable recent attention for a number of interesting properties, including increased nonlinear optical susceptibilities [33], which can be used to enhance nonlinear effects such as second harmonic generation [34], and wavelength enlargement, which allows light tunneling through narrow channels [35]. As in plasmonics, ENZ applications also require a low imaginary dielectric function component at the spectral range where the real di-electric function is low.…”

Section: Introductionmentioning

confidence: 99%

Relaxing graphene plasmon excitation constraints through the use of an epsilon-near-zero substrate

Alvarenga¹,

Bahamon²,

Peres³

et al. 2022

Preprint

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Graphene plasmons have attracted significant attention due to their tunability, potentially long propagation lengths and ultracompact wavelengths. However, the latter characteristic imposes challenges to light-plasmon coupling in practical applications, generally requiring sophisticated coupling setups, extremely high doping levels and/or graphene nanostructuting close to the resolution limit of current lithography techniques. Here, we propose and theoretically demonstrate a method for alleviating such a technological strain through the use of a practical substrate whose low and negative dielectric function naturally enlarges the graphene polariton wavelength to more manageable levels. We consider silicon carbide (SiC), as it exhibits a dielectric function whose real part is between -1 and 0, while its imaginary part remains lower than 0.05, in the 951 to 970 cm −1 mid-infrared spectral range. Our calculations show hybridization with the substrate's phonon polariton, resulting in a polariton wavelenth that is an order of magnitude longer than obtained with a silicon dioxide substrate, while the propagation length increases by the same amount.

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“…At wavelengths where the real part of the dielectric permittivity crosses zero, accompanied by a reasonably low imaginary part, the fascinating Epsilon-Near-Zero (ENZ) wave propagation regime occurs. [2][3][4] The vanishing permittivity enables a large variety of interesting optical properties such as nonlinear effects, [5][6][7][8] adiabatic frequency shifting, [9] ultrafast optical switching, [10,11] negative refraction, [12] intraband optical conductivity, [13] phase singularity engineering, [14] appearance of Casimir forces, [15] and metatronics. [16] The ENZ regime occurs naturally in some materials.…”

Section: Introductionmentioning

confidence: 99%

One‐Dimensional Epsilon‐Near‐Zero Crystals

Caligiuri

Biffi

Patra

et al. 2021

Advanced Photonics Research

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Alternating multilayer architectures are an ideal framework to tailor the properties of light. In photonic crystals, dielectrics with different refractive indices are periodically arranged to provide a photonic bandgap. Herein, it is shown that a periodic arrangement of metal/insulator layers gives rise to an Epsilon‐Near‐Zero (ENZ) crystal with distinct bands of vanishing permittivity. The analogy of metal/insulator/metal (MIM) cavities to wave mechanics that describes them as quantum‐wells for photons is elaborated, and the Kronig–Penney (KP) model is applied to MIM multilayers. This KP modeling allows to extract the density of ENZ states, evidencing a significant increase at the band edges, which makes ENZ crystals appealing for lasing applications. The ENZ bandwidth can be tuned by the thickness of the metal layers and can span the entire visible range, and the interactions between bands of two different cavity subsystems in more complex ENZ crystals enable more elaborate ENZ band engineering. Finally, the difference between the ENZ crystals and hyperbolic metamaterials is elucidated and the conditions that separate these two regimes are quantified. The ENZ crystals constitute a new paradigm in the study of metal/insulator multilayers, and showcase a promising platform for light–matter interaction in photonic and plasmonic technologies.

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Second-harmonic generation enhancement in monolayer transition-metal dichalcogenides by using an epsilon-near-zero substrate

Abstract: Monolayer transition-metal dichalcogenides (TMDCs) present high second-order optical nonlinearity, which is extremely desirable for, e.g., frequency conversion in nonlinear photonic devices. On the other hand, the atomic thickness of 2D...

Cited by 18 publications

References 67 publications

Optical Harmonic Generation in 2D Materials

Optical Harmonic Generation in 2D Materials

Relaxing graphene plasmon excitation constraints through the use of an epsilon-near-zero substrate

One‐Dimensional Epsilon‐Near‐Zero Crystals

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