Broadband, electrically tunable third-harmonic generation in graphene

Soavi, Giancarlo; Wang, Gang; Rostami, Habib; Purdie, David G.; Fazio, Domenico De; Ma, Teng; Luo, Birong; Wang, Junjia; Ott, A. K.; Yoon, Duhee; Bourelle, Sean A.; Muench, Jakob E.; Goykhman, Ilya; Conte, Stefano Dal; Celebrano, Michele; Tomadin, Andrea; Polini, Marco; Cerullo, Giulio; Ferrari, Andrea C.

doi:10.1038/s41565-018-0145-8

Cited by 233 publications

(252 citation statements)

References 54 publications

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“…Within the Dirac approximation, the first-and thirdorder LG results for MLG can be evaluated analytically and reproduce the previously identified logarithmic divergences. [28][29][30] By comparison with full dispersion tight-binding (TB), the Dirac approximation is shown to accurately capture the third-order response, even for highly doped systems, with Fermi level up to µ = 1.5 eV, that exceed current experimental reports.…”

Section: Introductionmentioning

confidence: 77%

Nonlinear optical response of doped monolayer and bilayer graphene: Length gauge tight-binding model

2018

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We compute the nonlinear optical response of doped mono-and bilayer graphene using the full dispersion based on tight-binding models. The response is derived with the density matrix formalism using the length gauge and is valid for any periodic system, with arbitrary doping. By collecting terms that define effective nonlinear response tensors, we identify all nonlinear Drude-like terms (up to third-order) and show that all additional spurious divergences present in the induced current vanish. The nonlinear response of graphene comprises a large Drude-like divergence and three resonances that are tightly connected with transitions occurring in the vicinity of the Fermi level. The analytic solution derived using the Dirac approximation captures accurately the firstand third-order responses in graphene, even at very high doping levels. The quadratic response of gapped graphene is also strongly enhanced by doping, even for systems with small gaps such as commensurate structures of graphene on SiC. The nonlinear response of bilayer graphene is significantly richer, combining the resonances that stem from doping with its intrinsic strong low-energy resonances.

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Section: Introductionmentioning

confidence: 77%

Nonlinear optical response of doped monolayer and bilayer graphene: Length gauge tight-binding model

2018

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“…(2) are therefore the proper 22 first-and secondorder non-local conductivities, which can be calculated microscopically for a given 2DEG Hamiltonian (see, e.g., Refs. 16,19,[23][24][25][26][27][28][29][30][31][32][33][34]. These encode the response to the total electric field E(r, t) which is the sum of E ext (r, t) and −∇U (r, t).…”

Section: Derivation Of the Pseudo-euler Equation From Nonlinear Omentioning

confidence: 99%

Pseudo-Euler equations from nonlinear optics: Plasmon-assisted photodetection beyond hydrodynamics

et al. 2019

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A great deal of theoretical and experimental efforts have been devoted in the last decades to the study of long-wavelength photodetection mechanisms in field-effect transistors hosting twodimensional (2D) electron systems. A particularly interesting subclass of these mechanisms is intrinsic and based on the conversion of the incoming electromagnetic radiation into plasmons, which resonantly enhance the photoresponse, and subsequent rectification via hydrodynamic nonlinearities. In this Article we show that such conversion and subsequent rectification occur well beyond the frequency regime in which hydrodynamic theory applies. We consider the nonlinear optical response of generic 2D electron systems and derive pseudo-Euler equations of motion for suitable collective variables. These are solved in one-and two-dimensional geometries for the case of graphene and the results are compared with those of hydrodynamic theory. Significant qualitative differences are found, which are amenable to experimental studies. Our theory expands the knowledge of the fundamental physics behind long-wavelength photodetection.

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“…With carbon atoms arranged in a honeycomb lattice through sp 2 bond, graphene along with its derivatives exhibits special physicochemical properties, which have shown extraordinary capability in various research areas (Bhimanapati et al, ; Bonaccorso et al, ). The successful study of graphene has made great contributions to the fundamental studies and potential practical applications of other two‐dimensional (2D) nanomaterials in different fields (Soavi et al, ). Different from conventional zero‐dimensional (0D) and one‐dimensional (1D) counterparts, 2D nanomaterials show unique properties resulting from their specific structure and morphology (Peng, Fang, Zhu, Yan, & Yu, ; H. Zhang, Chhowalla, & Liu, ).…”

Section: Introductionmentioning

confidence: 99%

Recent advancements in two‐dimensional nanomaterials for drug delivery

Mei

Wang

et al. 2019

WIREs Nanomed Nanobiotechnol

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Different from conventional zero‐dimensional (0D) and one‐dimensional (1D) counterparts, two‐dimensional (2D) nanomaterials show unique properties resulting from their specific structure and morphology. In recent years, broad interest has been focused on the exploration of 2D nanomaterials for drug delivery, which benefits greatly to various disease treatments due to the superior properties of 2D nanomaterials. The fast development of 2D‐based drug delivery systems provides great potential for biomedical studies. In this review, a case‐by‐case analysis was carried out on the state‐of‐the‐art 2D nanomaterials‐based drug delivery systems, which possesses great significance to the further biomedical development of 2D nanomaterials. For the purpose of discussing the special advantages of these novel drug delivery systems, this review is organized according to the different types of the latest 2D nanomaterials and their loading capacity towards various cargos. Special emphasis will be located on the application of these 2D nanomaterials‐based drug delivery systems in chemotherapy, gene therapy, and immunotherapy. This article is categorized under: Therapeutic Approaches and Drug Discovery > Emerging Technologies

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Broadband, electrically tunable third-harmonic generation in graphene

Cited by 233 publications

References 54 publications

Nonlinear optical response of doped monolayer and bilayer graphene: Length gauge tight-binding model

Nonlinear optical response of doped monolayer and bilayer graphene: Length gauge tight-binding model

Pseudo-Euler equations from nonlinear optics: Plasmon-assisted photodetection beyond hydrodynamics

Recent advancements in two‐dimensional nanomaterials for drug delivery

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