Highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides

Lutong Cai, Andrey Gorbach, Yiwen Wang, Hui Hu, Wei Ding

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The inherent trade-off between efficiency and bandwidth of three-wave mixing processes in χ2 nonlinear waveguides is the major impediment for scaling down many well-established frequency conversion schemes onto the level of integrated photonic circuit. Here, we show that hybridization between modes of a silica microfiber and a LiNbO3 nanowaveguide, amalgamated with laminar χ2 patterning, offers an elegant approach for engineering broadband phase matching and high efficiency of three-wave mixing processes in an ultra-compact and natively fiber-integrated setup. We demonstrate exceptionally high normalized second harmonic generation (SHG) efficiency of up to ηnor ≈ 460% W−1 cm−2, combined with a large phase matching bandwidth of Δλ ≈ 100 nm (bandwidth-length product of Δλ · L ≈ 5 μm2) near the telecom bands, and extraordinary adjustment flexibility.
Original languageEnglish
Article number12478
Pages (from-to)1-9
Number of pages9
JournalScientific Reports
Volume8
Issue number1
Early online date20 Aug 2018
DOIs
Publication statusPublished - 1 Dec 2018

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lithium niobates
harmonic generations
nonlinearity
broadband
phase matching
waveguides
bandwidth
fibers
microfibers
frequency converters
flexibility
adjusting
engineering
photonics
silicon dioxide
scaling
products

ASJC Scopus subject areas

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Highly efficient broadband second harmonic generation mediated by mode hybridization and nonlinearity patterning in compact fiber-integrated lithium niobate nano-waveguides. / Cai, Lutong; Gorbach, Andrey; Wang, Yiwen; Hu, Hui; Ding, Wei.

In: Scientific Reports, Vol. 8, No. 1, 12478, 01.12.2018, p. 1-9.

Research output: Contribution to journalArticle

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