Ba2Ge2Te5: a ternary NLO-active telluride with unusual one-dimensional helical chains and giant second-harmonic-generation tensors

2021 ◽  
Author(s):  
Mao-Yin Ran ◽  
Zuju Ma ◽  
Xintao Wu ◽  
Hua Lin ◽  
Qi-Long Zhu
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Metal Chalcogenides ◽  
One Dimensional

The class of non-centrosymmetric (NCS) metal chalcogenides is the most favorable candidates for promising nonlinear optical (NLO) crystals in the infrared (IR) band. However, most research achievements pay them attention...

scholarly journals Na4Yb(CO3)3F: A New UV Nonlinear Optical Material with a Large Second Harmonic Generation Response

Crystals ◽  
2018 ◽  
Vol 8 (10) ◽  
pp. 381
Author(s):  
Qiaoling Chen ◽  
Min Luo ◽  
Chensheng Lin
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Diffuse Reflectance ◽  
Second Harmonic ◽  
Three Dimensional ◽  
One Dimensional ◽  
Nonlinear Optical Crystals ◽  
3D Network ◽  
3D Framework

A new nonlinear optical crystals fluoride carbonate, Na4Yb(CO3)3F, has been synthesized by mild hydrothermal method. The Na4Yb(CO3)3F crystallizes in the noncentrosymmetric space group Cc (no. 9) with the lattice parameters a = 8.018(3), b = 15.929(5), c = 13.950(5) Å and β = 101.425(6)°. The compound Na4Yb(CO3)3F has a high density of [CO3] groups. The structure can be described as one-dimensional [Na5Yb(CO3)2F2] chains connected by [CO3] groups, forming an intricate three-dimensional (3D) framework. Other Na+ and Yb3+ cations are located in the cavities of 3D network. The powder second harmonic generation (SHG) measurement shows that Na4Yb(CO3)3F features a large SHG response, about 4.3 times that of KH2PO4 (KDP), and is a phase-matchable material. In addition, its UV-Vis-NIR diffuse reflectance spectral data indicate that Na4Yb(CO3)3F has a large optical gap about 4.72 eV, which corresponds to the UV cut-off edge of 263 nm.

scholarly journals Significant second-harmonic generation and bulk photovoltaic effect in trigonal selenium and tellurium chains

2021 ◽  
Author(s):  
Mei-Juan Cheng ◽  
Xiao-Hong Shi ◽  
Shunqing Wu ◽  
Zizhong Zhu
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
First Principles ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Photovoltaic Effect ◽  
First Principles Calculations ◽  
Nlo Properties ◽  
One Dimensional ◽  
Linear And Nonlinear

One-dimensional (1D) selenium and tellurium crystalize in helical chainlike structures and thus exhibit fascinating properties. By performing first-principles calculations, we have researched the linear and nonlinear optical (NLO) properties of...

Intrinsic Helical Twist and Chirality in Ultrathin Tellurium Nanowires

Nanoscale ◽  
2021 ◽  
Author(s):  
Alejandra Londono-Calderon ◽  
Darrick Williams ◽  
Matthew M Schneider ◽  
Benjamin H Savitzky ◽  
Colin Ophus ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Circular Polarization ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
One Dimensional ◽  
Helical Twist ◽  
The One ◽  
Tellurium Nanowires ◽  
Meso Scale

Robust atomic-to-meso-scale chirality is now observed in the one-dimensional form of tellurium. This enables a large and counter-intuitive circular-polarization dependent second harmonic generation response above 0.2 which is not present...

Enhancement of second harmonic generation using a novel asymmetric metal–graphene–insulator–metal plasmonic waveguide

2018 ◽  
Vol 27 (01) ◽  
pp. 1850003 ◽  
Author(s):  
Mohamadreza Soltani
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Field Enhancement ◽  
The Other ◽  
Nonlinear Susceptibility ◽  
Optical Process ◽  
Large Enhancement ◽  
Nonlinear Optical Process

Here, we propose a novel plasmonic structure, called asymmetric plasmonic nanocavity grating (APNCG), which is shown to dramatically enhance nonlinear optical process of second harmonic generation (SHG). The proposed structure consists of two different metals on both sides of lithium niobate and a thin layer of graphene. By using two different metals the nonlinear susceptibility of the waveguide would be increased noticeably causing to increase SHG. On the other hand, it consists of two identical gratings on one side. By two identical gratings, the pump beam is coupled to two opposing SPP waves, which interfere with each other and result in SPP standing wave in the region between the two gratings. The distance between two gratings will be optimized to reach the highest SHG. It will be shown that by optimizing the geometry of proposed structure and using different metals, field enhancement in APNCG waveguides can result in large enhancement of SHG.

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