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Article

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

by
Zhijin Huang
1,†,
Huihui Lu
2,†,
Hanqing Xiong
2,
Yang Li
1,
Huajiang Chen
1,
Wentao Qiu
1,*,
Heyuan Guan
2,*,
Jiangli Dong
1,
Wenguo Zhu
2,
Jianhui Yu
2,
Yunhan Luo
2,
Jun Zhang
1 and
Zhe Chen
2
1
Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, JinanUniversity, Guangzhou 510632, China
2
Key Laboratory of Optoelectronic Information and Sensing Technologies of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
*
Authors to whom correspondence should be addressed.
†
The authors contributed equally to his work.
Nanomaterials 2019, 9(1), 69; https://doi.org/10.3390/nano9010069
Submission received: 13 December 2018 / Revised: 29 December 2018 / Accepted: 31 December 2018 / Published: 5 January 2019
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Abstract

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.
Keywords: lithium niobate; harmonic generation and mixing; Fano resonance lithium niobate; harmonic generation and mixing; Fano resonance

Share and Cite

MDPI and ACS Style

Huang, Z.; Lu, H.; Xiong, H.; Li, Y.; Chen, H.; Qiu, W.; Guan, H.; Dong, J.; Zhu, W.; Yu, J.; et al. Fano Resonance on Nanostructured Lithium Niobate for Highly Efficient and Tunable Second Harmonic Generation. Nanomaterials 2019, 9, 69. https://doi.org/10.3390/nano9010069

AMA Style

Huang Z, Lu H, Xiong H, Li Y, Chen H, Qiu W, Guan H, Dong J, Zhu W, Yu J, et al. Fano Resonance on Nanostructured Lithium Niobate for Highly Efficient and Tunable Second Harmonic Generation. Nanomaterials. 2019; 9(1):69. https://doi.org/10.3390/nano9010069

Chicago/Turabian Style

Huang, Zhijin, Huihui Lu, Hanqing Xiong, Yang Li, Huajiang Chen, Wentao Qiu, Heyuan Guan, Jiangli Dong, Wenguo Zhu, Jianhui Yu, and et al. 2019. "Fano Resonance on Nanostructured Lithium Niobate for Highly Efficient and Tunable Second Harmonic Generation" Nanomaterials 9, no. 1: 69. https://doi.org/10.3390/nano9010069

APA Style

Huang, Z., Lu, H., Xiong, H., Li, Y., Chen, H., Qiu, W., Guan, H., Dong, J., Zhu, W., Yu, J., Luo, Y., Zhang, J., & Chen, Z. (2019). Fano Resonance on Nanostructured Lithium Niobate for Highly Efficient and Tunable Second Harmonic Generation. Nanomaterials, 9(1), 69. https://doi.org/10.3390/nano9010069

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