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Light-frequency conversion based on two-dimensional (2D) materials is of great importance for modern nano and integrated photonics. Herein, we report both the intrinsic (from the pure WX (X=S, Se and Te)) and extrinsic (from the interface of graphene/WX) second order nonlinear coefficient tensor from graphene/WX van der Waals (vdW) heterostructures by first-principles calculations. The prominent peaks in the dispersion relationship of the intrinsic second order nonlinear coefficient in monolayer WX are due to the Van Hove singularity in the high symmetry point or along the high symmetry line with high joint density of states. The enhanced nonlinear optical response in the infrared band can be achieved in graphene/WS vdW heterostructures, resulting from the interlayer charge transfer between graphene and WS. The value of the intrinsic second order nonlinear coefficients of graphene/WSe vdW heterostructures is two times larger than that of pure monolayer WSe at the bandgap energy of monolayer WSe due to the enhanced carrier generation at K point after the heterostructures formation. Different from pure monolayer WX, azimuthal angle dependent second harmonic generation from graphene/WX vdW heterostructures exhibits extraordinary rotational symmetry at different photon energy, which can be used to deduce the extrinsic second order nonlinear coefficient. These results pave the way for the nonlinear optical coefficient design based on 2D heterostructures for the nonlinear nano photonics and integrated devices.
This article was published in the following journal.
Name: The journal of physical chemistry letters
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Microscopic imaging techniques that utilize nonlinear responses of light-matter interactions which occur with high-intensity illumination, such as from LASERS, and specialized light signal detection instrumentation to produce images without the need for dyes or fluorescent labels.
The use of light interaction (scattering, absorption, and fluorescence) with biological tissue to obtain morphologically based information. It includes measuring inherent tissue optical properties such as scattering, absorption, and autofluorescence; or optical properties of exogenous targeted fluorescent molecular probes such as those used in optical MOLECULAR IMAGING, or nontargeted optical CONTRAST AGENTS.
The study of systems which respond disproportionately (nonlinearly) to initial conditions or perturbing stimuli. Nonlinear systems may exhibit "chaos" which is classically characterized as sensitive dependence on initial conditions. Chaotic systems, while distinguished from more ordered periodic systems, are not random. When their behavior over time is appropriately displayed (in "phase space"), constraints are evident which are described by "strange attractors". Phase space representations of chaotic systems, or strange attractors, usually reveal fractal (FRACTALS) self-similarity across time scales. Natural, including biological, systems often display nonlinear dynamics and chaos.
Products or parts of products used to detect, manipulate, or analyze light, such as LENSES, refractors, mirrors, filters, prisms, and OPTICAL FIBERS.
An imaging method using LASERS that is used for mapping subsurface structure. When a reflective site in the sample is at the same optical path length (coherence) as the reference mirror, the detector observes interference fringes.
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