Robust modal phase matching in subwavelength x-cut and z-cut lithium niobate thin-film waveguides

Lingzhi Peng; Lihong Hong; Baoqin Chen; Peng He; Zhiyuan Li

doi:10.3788/COL202119.071902

Journals >Chinese Optics Letters >Volume 19 >Issue 7 >Page 071902 > Article

Chinese Optics Letters
Vol. 19, Issue 7, 071902 (2021)

Robust modal phase matching in subwavelength x-cut and z-cut lithium niobate thin-film waveguides

Lingzhi Peng¹, Lihong Hong¹, Baoqin Chen¹, Peng He^2、3、**, and Zhiyuan Li^1、*

Author Affiliations

¹School of Physics and Optoelectronics, South China University of Technology, Guangzhou 510641, China

²Guangdong Full-Spectra Laser Technology Co., Ltd., Dongguan 523808, China

³Dongguan Sanhang Innovation Research Institute, Dongguan 523808, China

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DOI: 10.3788/COL202119.071902 Cite this Article Set citation alerts

Lingzhi Peng, Lihong Hong, Baoqin Chen, Peng He, Zhiyuan Li. Robust modal phase matching in subwavelength x-cut and z-cut lithium niobate thin-film waveguides[J]. Chinese Optics Letters, 2021, 19(7): 071902 Copy Citation Text

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Structures of the LN thin-film waveguide and the schemes of the phase matching process. E1, β1 and E2, β2 denote the electric field and transport constant of FW pump light and SHW signal light, respectively: (a) x-cut LN thin film; (b) z-cut LN thin film.

Fig. 1. Structures of the LN thin-film waveguide and the schemes of the phase matching process. E₁,

β_{1}

and E₂,

β_{2}

denote the electric field and transport constant of FW pump light and SHW signal light, respectively: (a) x-cut LN thin film; (b) z-cut LN thin film.

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Dispersion curves of EL+EL→EL phase-matching scheme in LN waveguide for various guided modes. The red star point represents the phase-matching point: (a) x-cut LN thin film; (b) z-cut LN thin film.

Fig. 2. Dispersion curves of

EL + EL \to EL

phase-matching scheme in LN waveguide for various guided modes. The red star point represents the phase-matching point: (a) x-cut LN thin film; (b) z-cut LN thin film.

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Fig. 3. (a) and (b) are normalized electric field distributions in x-cut LN thin film and z-cut LN thin film, respectively. (c) and (d) are energy flux density diagrams in x-cut LN thin film and z-cut LN thin film, respectively. The insets are the distributions of light intensity.

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Fig. 4. (a) Phase-matching wavelength and efficiency of SHG in dependence on the thickness of LN thin film; (b) dependence of conversion efficiency on FW pump light intensity under large signal conditions.

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	$\| κ \| (pm / V)$	$η$
x-cut	\|κ₁\| = 0.199d₃₃ = 5.37	9.27%
	\|κ₂\| = 0.219d₃₃ = 5.91
z-cut	\|κ₁\| = 0.248d₃₃ + 0.113d₃₁ = 7.31	13.9%
	\|κ₂\| = 0.243d₃₃ + 0.111d₃₁ = 7.16