High conversion efficiency second-harmonic beam shaping via amplitude-type nonlinear photonic crystals

2019 ◽  
Vol 45 (1) ◽  
pp. 220 ◽  
Author(s):  
Bing Zhu ◽  
Haigang Liu ◽  
Yuping Chen ◽  
Xianfeng Chen
Keyword(s):  
Photonic Crystals ◽  
Conversion Efficiency ◽  
Second Harmonic ◽  
Beam Shaping ◽  
High Conversion ◽  
High Conversion Efficiency ◽  
Nonlinear Photonic Crystals ◽  
Harmonic Beam

Research on Second Harmonic Generation in Two-Dimensional Periodical Nonlinear Photonic Crystals Based on Intelligent Materials

2011 ◽  
Vol 282-283 ◽  
pp. 716-720
Author(s):  
Jing Juan Li ◽  
Li Wang
Keyword(s):  
Photonic Crystals ◽  
Harmonic Generation ◽  
Conversion Efficiency ◽  
Second Harmonic ◽  
Harmonic Wave ◽  
Square Lattice ◽  
Two Dimensional ◽  
High Conversion Efficiency ◽  
Nonlinear Photonic Crystals ◽  
Different Order

The works are focused on finding out proper shape of reversed domains to obtain effective harmonic generations with high conversion efficiency. The conversion efficiency of second harmonic wave in two-dimensional nonlinear photonic crystals consisting of square lattice and reversed domains of various shapes are studied numerically. The shapes of reversed domains are extended from circle, square to ellipse and rectangle. The conversion efficiency of different order quasi-phase matched process can be maximized by adjusting the orientation of noncircular reversed domains. Moreover, a cross-shaped reversed domain is utilized to improve the conversion efficiency of two-order non-collinear quasiphase matching.

High conversion efficiency of second‐harmonic generation in step quantum wells

1992 ◽  
Vol 61 (20) ◽  
pp. 2401-2402 ◽  
Author(s):  
Zhenghao Chen ◽  
Dafu Cui ◽  
Meihua Li ◽  
Chao Jiang ◽  
Junming Zhou ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Quantum Wells ◽  
Harmonic Generation ◽  
Conversion Efficiency ◽  
Second Harmonic ◽  
High Conversion ◽  
High Conversion Efficiency

scholarly journals Peculiarities of second harmonic generation with chirped femtosecond pulses at high conversion efficiency

2020 ◽  
Vol 455 ◽  
pp. 124462 ◽  
Author(s):  
Pierre-Marc Dansette ◽  
Raimundas Burokas ◽  
Laurynas Veselis ◽  
Audrius Zaukevičius ◽  
Andrejus Michailovas ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Conversion Efficiency ◽  
Second Harmonic ◽  
High Conversion ◽  
Femtosecond Pulses ◽  
High Conversion Efficiency

scholarly journals Fano Resonance on Nanostructured Lithium Niobate for Highly Efficient and Tunable Second Harmonic Generation

Nanomaterials ◽  
2019 ◽  
Vol 9 (1) ◽  
pp. 69 ◽  
Author(s):  
Zhijin Huang ◽  
Huihui Lu ◽  
Hanqing Xiong ◽  
Yang Li ◽  
Huajiang Chen ◽  
...  
Keyword(s):  
Lithium Niobate ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Conversion Efficiency ◽  
Fano Resonance ◽  
Second Harmonic ◽  
High Conversion ◽  
Nonlinear Microscopy ◽  
High Conversion Efficiency ◽  
Nonlinear Conversion

Second harmonic generation (SHG) is an important nonlinear process which is critical for applications, such as optical integrated circuit, nonlinear microscopy, laser, etc. Many challenges remain in the improvement of nonlinear conversion efficiency, since the typical value is of only 10−5 in nanostructures. Here, we theoretically demonstrate a periodic structure consisting of a lithium niobate (LN) bar and an LN disk, on a nanoscale (~300 nm) thin-film platform, which is proposed for a highly efficient SHG. By breaking the structure symmetry, a Fano resonance with a high Q, up to 2350 and a strong optical field enhancement reaching forty-two folds is achieved, which yields a high conversion efficiency, up to 3.165 × 10−4. In addition to its strong second harmonic (SH) signal, we also demonstrate that by applying only 0.444 V on the planar electrode configurations of the nanostructured LN, the wavelength of SH can be tuned within a 1 nm range, while keeping its relatively high conversion efficiency. The proposed structure with the high nonlinear conversion efficiency can be potentially applied for a single-molecule fluorescence imaging, high-resolution nonlinear microscopy and active compact optical device.

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