Search query: second harmonic generation in 2D

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abstract: Two dimensional semiconductor materials have shown strong non linear optical properties at the monolayer limit due to the lack of inversion symmetry. These non linear materials can ideally be combined with top down planar fabrication methods to offer new optical devices that can be integrated on chip as compared to large bulk non linear crystals. Here, we show enhanced second harmonic generation (SHG) from monolayer MoS2 embedded within an all dielectric Fabry Perot microcavity that is resonant at the pump wavelength. Power dependency shows a 10 fold increase in second harmonic generation matching theoretical estimate.
author_names: Jared K Day

M Chung

Yi-Hsien Lee

Vinod M Menon
title: Microcavity enhanced second harmonic generation in 2D MoS_2
year: 2016

abstract: Second harmonic generation (SHG) of two dimensional (2D) layered materials has attracted immense research interests due to the abilities of photon generation, manipulation, transmission, detection, and imaging for the applications of modern on chip nanophotonic devices. Some layered materials with broken inversion symmetry associated with their 2D nature enable the development of nanophotonic and nanooptoelectronic devices based on the second harmonic generation effect. Recently, many 2D materials with broken inversion symmetry have been discovered, which not only exhibit SHG quantum effects but also greatly promote the development of nanophotonics. In this review, we review the recent developments of all 2D SHG materials, including the graphene like family, transition metal dichalcogenides (TMDs) IIIA VIA compounds and others. We focus on their fabrication, structural characteristics, and generating mechanism and basic characteristics of SHG, associated with the main strategies to tune, modulate, and enhance the SHG of 2D materials. Additionally, several practical applications and possible future research directions of 2D material based SHG are discussed.
author_names: Jiantian Zhang

Weina Zhao

Peng Yu

Guowei Yang

Zixun Liu
title: Second harmonic generation in 2D layered materials
year: 2020

abstract: The Rashba effect (RE) caused by concurrent spin orbit coupling and structural inversion asymmetry (SIA) has been invoked to explain outstanding optoelectronic properties of hybrid organic inorganic perovskites (HOIPs) The SIA in HOIPs also manifests itself in second harmonic generation (SHG) Here, we establish a quantitative relation between the RE strength and the low frequency SHG value in two dimensional (2D) and three dimensional (3D) HOIPs using a newly developed effective mass model. The calculated SHG, which exhibits one and two photon resonances between the valence and conduction bands, approaches a finite value at low frequencies. Using the measured SHG values in literature, the estimated RE strength is 10 3 eV A for 3D CH3NH3PbI3 and 4 x 10 2 eV A for 2D (C4H9NH3)2PbI4. Our results facilitate a simple and reliable determination of the RE strengths of 2D and 3D HOIPs and help quantify the impact of RE on various properties in HOIPs.
author_names: Zhi-Gang Yu
title: Estimation of the Rashba Strength from Second Harmonic Generation in 2D and 3D Hybrid Organic Inorganic Perovskites
year: 2018

abstract: Second harmonic generation (SHG) from a monolayer MoS2 is enhanced by embedding within an all dielectric microcavity resonant at the pump wavelength. Power dependency shows a 10 fold increase in SH emission matching theoretical estimate.
author_names: Jared K Day

Yi-Hsien Lee

Vinod M Menon
title: Microcavity enhanced second harmonic generation in 2D semiconductors
venue: 2016 Conference on Lasers and Electro Optics (CLEO)
year: 2016

abstract: Theoretical analysis is given to second harmonic generation in 2D nonlinear photonic crystals of rectangular symmetry with rectangular domains. Formulas for the nonlinear response of the crystal with an arbitrary domain structure are derived within the approximation of a given field. A possibility of calculating time profiles of second harmonic pulses down to the femtosecond range is demonstrated.
author_names: B E Eshniezov

Bakhodir Eshchanov

Djavdat B Yusupov

Kakhramon Ergashov

Usman K Sapaev
title: On the theory of second harmonic generation in 2D nonlinear photonic crystals with arbitrary domain structures
year: 2016

abstract: and Magnetic Fields A.L. Morales, M.E. Mora Ramos and C.A. Duque Grupo de Materia Condensada UdeA, Instituto de Fisica, Facultad de Ciencias Exactas y Naturales Universidad de Antioquia UdeA, Calle 70 No. 52 21, Medellin, Colombia Facultad de Ciencias, Universidad Autonoma del Estado de Morelos, Cuernavaca, Mexico Fisica Teorica y Aplicada, Escuela de Ingenieria de Antioquia, Envigado, Antioquia, Colombia
author_names: Alvaro Luis Morales

Miguel E Mora-Ramos

C A Duque
title: Nonlinear Optical Rectification and Second Harmonic Generation in 2D Quantum Rings under Electric Field and Magnetic Fields
year: 2014

abstract: Two dimensional (2D) materials have brought a spectacular revolution in fundamental research and industrial applications due to their unique physical properties of atomically thin thickness, strong light matter interaction, unity valley polarization and enhanced many body interactions. To fully explore their exotic physical properties and facilitate potential applications in electronics and optoelectronics, an effective and versatile characterization method is highly demanded. Among the many methods of characterization, optical second harmonic generation (SHG) has attracted broad attention because of its sensitivity, versatility and simplicity. The SHG technique is sufficiently sensitive at the atomic scale and therefore suitable for studies on 2D materials. More importantly, it has the capacity to acquire abundant information ranging from crystallographic, and electronic, to magnetic properties in various 2D materials due to its sensitivity to both spatial inversion symmetry and time reversal symmetry. These advantages accompanied by its characteristics of non invasion and high throughput make SHG a powerful tool for 2D materials. This review summarizes recent experimental developments of SHG applications in 2D materials and also provides an outlook of potential prospects based on SHG.
author_names: Dingxin Zou

Muhong Wu
title: Rich information on 2D materials revealed by optical second harmonic generation.
venue: Nanoscale
year: 2020

abstract: Abstract Photonic crystal waveguides (PCW) have shown great potential to generate second harmonic (SH) but the available schemes with cavity or defect suffer from a lack of multiple wavelengths operation and excessive phase matching requirement. Here we propose a 2D PCW structure comprised of a modulated single line defect, which is capable of independently controlling the fundamental frequency (FF) and SH modes. Therefore, two near flat group velocity dispersions can be achieved for these modes, and they simultaneously satisfy phase matching conditions. Based on multiply scattering method, we theoretically demonstrate that the SH resonant modes originated from the nonradiative near flat dispersion have high quality factors (nearly 6 5 x 1 0 4 for the maximum value) And the maximum SH conversion efficiency for these resonant modes are 2 orders of magnitude higher than that of off resonant modes. In addition, benefitting from the matching of the group velocities of the second harmonic and the fundamental, the central wavelength of SH can be modulated within wavelength range 3nm. These results can provide potential applications in on chip integration of photonics and quantum optics.
author_names: Jia-bin Zhang

Hai Lu

Kesheng Shen

Hongchao Liu

Yun Zheng

Xiaolong Zhang
title: Second harmonic generation from 2D photonic crystal waveguide with simultaneous near flat dispersions at fundamental frequency and second harmonic
year: 2020

abstract: Optical second harmonic generation in strained two dimensional semiconductors and electroluminescence from multi particle exciton complexes in these materials will be discussed.
author_names: T Mueller

Lukas Mennel

Matthias Paur

Aday J Molina-Mendoza
title: Second Harmonic Generation and Electroluminescence in 2D Semiconductors
year: 2019

abstract: We investigate two photon transitions to the electron hole scattering continuum in monolayer transition metal dichalcogenides, and identify two contributions to this nonlinear optical process with opposite circularly polarized valley selection rules. In the non interacting limit, the competition between the two contributions leads to a crossover of the selection rule with the increase of the two photon energy. With the strong Coulomb interaction between the electron and hole, the two contributions excite electron hole scattering states in orthogonal angular momentum channels, while the strength of the transition can be substantially enhanced by the interaction. Based on this picture of the two photon transition, the second harmonic generation (SHG) in the electron hole continuum is analyzed, where the Coulomb interaction is shown to greatly alter the relative strength of different cross circular polarized SHG processes. Valley current injection by the quantum interference of one photon and two photon transition is also investigated in the presence of the strong Coulomb interaction, which significantly enhances the injection rate.
author_names: Pu Gong

Hongyi Yu

Yong Wang

Wang Yao
title: Nonlinear optics in the electron hole continuum in 2D semiconductors: two photon transition, second harmonic generation and valley current injection
venue: Science Bulletin
year: 2019