Design of folded hybrid silicon carbide-lithium niobate waveguides for efficient second-harmonic generation

Weigel, Peter O.; Mookherjea, Shayan

doi:10.1364/josab.35.000593

Cited by 15 publications

(6 citation statements)

References 23 publications

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“…[15][16][17][18][19][20][21] Recently, thin film crystalline LiNbO 3 (with a typical thickness of 300-900 nm) offers a unique platform to implement on-chip integration of various devices with outstanding performance. [22][23][24][25][26][27][28] The further processing of LNOI wafers enables the construction of nanophotonic waveguides with tightly confined modal fields, in which the interaction of optical waves is significantly enhanced accordingly. Highly efficient nonlinear optical conversion processes have been demonstrated within nanophotonic devices with compact footprints, e.g., loaded waveguide, [29] ridge waveguide, [30][31][32][33][34][35][36] and microring/disk resonators.…”

Section: Introductionmentioning

confidence: 99%

Efficient Second Harmonic Generation in a Reverse‐Polarization Dual‐Layer Crystalline Thin Film Nanophotonic Waveguide

Wang

Zhang

Chen

2021

Laser & Photonics Reviews

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Second harmonic generation (SHG), one of the most significant χ(2) nonlinear optical processes, plays a crucial role in a wide variety of optical and photonic applications. Designing various delicate schemes to achieve highly efficient SHG has become a long‐standing and challenging topic in nonlinear optics. Despite numerous success on SHG based on birefringent phase‐matching and quasi‐phase‐matching, so far, modal phase‐matching (MPM) for SHG in tightly light‐confined structures has still in its infancy. Here, a new scheme is proposed to realize efficient SHG via MPM by using a nanophotonic LiNbO3 thin‐film waveguide consists of two bonded layers with internally reversed polarizations. In such a dual‐layer ridge waveguide based on lithium niobate on insulator (LNOI), upon optical excitation at 1574.6 nm, SHG is observed at 787.3 nm with a high conversion efficiency of 5540% W−1 cm−2 experimentally. This work advances the understanding on modal phase‐matched SHG and other quadratic optical nonlinear processes, offering additional strategies for developing high‐performance nonlinear photonic devices in on‐chip platforms.

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Section: Introductionmentioning

confidence: 99%

Efficient Second Harmonic Generation in a Reverse‐Polarization Dual‐Layer Crystalline Thin Film Nanophotonic Waveguide

Wang

Zhang

Chen

2021

Laser & Photonics Reviews

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“…Under weak pumping conditions, the coupling mode equations for the SH and cascaded TH processes are [30,31] dA…”

Section: Theory Of Cascaded Third-harmonic Generationmentioning

confidence: 99%

Efficient Cascaded Third‐Harmonic Generation in Sampled‐Grating Periodically‐Poled Lithium Niobate Waveguides

Wu,

Zhang,

Hao

et al. 2024

Laser & Photonics Reviews

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Periodically poled thin‐film lithium niobate (PPTFLN) waveguides enable efficient quadratic nonlinear processes due to the strong light confinement and the utilization of the largest nonlinear coefficient d33 of lithium niobate. Here, an efficient third harmonic (TH) generation is reported with a normalized conversion efficiency of 6481% W−2 cm−4 in a sampled‐grating PPTFLN waveguide under the pump of a continuous laser, which is improved by 4 orders of magnitude compared with reported results. Such an efficient TH generation is realized by cascaded second‐harmonic (SH) generation and sum‐frequency (SF) generation supported by a sampled‐grating domain structure with two Fourier coefficients of 0.44 and 0.37, respectively. Phase matching conditions for the SH and cascaded SF processes are simultaneously achieved by finely tuning the geometric dispersion, domain structure, and operating temperature of the PPTFLN waveguides.

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“…However, the electro-optical modulation efficiency of titanium diffused LN waveguide is low. Around 2016, thin film lithium niobate (TFLN) wafers were commercially produced, giving rise to a series of studies based on TFLN [ 12 , 13 , 14 , 15 , 16 ]. TFLN waveguides are mostly formed by dry etching, allowing for high electro-optical modulation efficiency.…”

Section: Introductionmentioning

confidence: 99%

Miniature Fourier Transform Spectrometer Based on Thin-Film Lithium Niobate

et al. 2023

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A miniature Fourier transform spectrometer is proposed using a thin-film lithium niobate electro-optical modulator instead of the conventional modulator made by titanium diffusion in lithium niobate. The modulator was fabricated by a contact lithography process, and its voltage-length and optical waveguide loss were 2.26 V·cm and 1.01 dB/cm, respectively. Based on the wavelength dispersion of the half-wave voltage of the fabricated modulator, the emission spectrum of the input signal was retrieved by Fourier transform processing of the interferogram, and the analysis of the experimental data of monochromatic light shows that the proposed miniaturized FTS can effectively identify the input signal wavelength.

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Design of folded hybrid silicon carbide-lithium niobate waveguides for efficient second-harmonic generation

Cited by 15 publications

References 23 publications

Efficient Second Harmonic Generation in a Reverse‐Polarization Dual‐Layer Crystalline Thin Film Nanophotonic Waveguide

Efficient Second Harmonic Generation in a Reverse‐Polarization Dual‐Layer Crystalline Thin Film Nanophotonic Waveguide

Efficient Cascaded Third‐Harmonic Generation in Sampled‐Grating Periodically‐Poled Lithium Niobate Waveguides

Miniature Fourier Transform Spectrometer Based on Thin-Film Lithium Niobate

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