Phase-matched second harmonic generation with on-chip GaN-on-Si microdisks

Roland, Isabelle; Gromovyi, Maksym; Zeng, Y.; Kurdi, M. El; Sauvage, S.; Brimont, Christelle; Guillet, Thierry; Gayral, B.; Sèmond, F.; Duboz, Jean‐Yves; Micheli, Marc de; Checoury, X.; Boucaud, P.

doi:10.1038/srep34191

Cited by 65 publications

(42 citation statements)

References 43 publications

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“…The conversion efficiency obtained for GaN here exceeds previous experimental reports of SHG in a GaN PhC cavity by more than two orders of magnitude. 6 It also compares well with phase-matched approaches in GaN ring and disk resonator platforms, 19,20 where experimental normalized conversion efficiency values of 0.3 × 10 3 W 1 and 2 × 10 3 W 1 for SHG can be extracted, respectively. It is expected that further enhancement using a doubly resonant scheme in GaN PhCs could bring the SHG conversion efficiency closer to state-of-the-art ring resonators in AlN, 21 although at the expense of stringent energy and phase matching requirements.…”

Section: Apl Photonics 2 031301 (2017)mentioning

confidence: 90%

Efficient continuous-wave nonlinear frequency conversion in high-Q gallium nitride photonic crystal cavities on silicon

et al. 2017

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We report on nonlinear frequency conversion from the telecom range via second harmonic generation (SHG) and third harmonic generation (THG) in suspended gallium nitride slab photonic crystal (PhC) cavities on silicon, under continuous-wave resonant excitation. Optimized two-dimensional PhC cavities with augmented far-field coupling have been characterized with quality factors as high as 4.4 × 104, approaching the computed theoretical values. The strong enhancement in light confinement has enabled efficient SHG, achieving a normalized conversion efficiency of 2.4 × 10−3 W−1, as well as simultaneous THG. SHG emission power of up to 0.74 nW has been detected without saturation. The results herein validate the suitability of gallium nitride for integrated nonlinear optical processing.

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Section: Apl Photonics 2 031301 (2017)mentioning

confidence: 90%

Efficient continuous-wave nonlinear frequency conversion in high-Q gallium nitride photonic crystal cavities on silicon

et al. 2017

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“…Among these, SHG is specifically important for a range of applications including precision frequency metrology [1,2], optical clocks [3], molecular imaging [4,5], and quantum-information processing [6,7]. Compared with traditional SHG in bulk materials [8], the advanced nanophotonic techniques have enabled SHG in a miniaturized and powerefficient microchip based on a variety of integrated photonics platforms, such as silicon nitride [9,10], gallium arsenide [11,12], aluminum nitride (AlN) [13][14][15], lithium niobate (LN) [16][17][18][19][20][21], and others [22][23][24][25][26]. Among these, LN is particularly attractive due to its large χ (2) nonlinearity, a broad transparency window from 350 nm to 4.5 µm, flexibility in ferroelectric domain control as well as recent advances in the development of low-loss thin-film LN on insulator (LNOI) platform [16][17][18][19][20][21][27][28][29][30][31][32][33][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

Periodically poled thin-film lithium niobate microring resonators with a second-harmonic generation efficiency of 250,000%/W

Lu¹,

Surya²,

Liu³

et al. 2019

Optica

349

182

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Lithium niobate (LN), dubbed by many as the silicon of photonics, has recently risen to the forefront of chip-scale nonlinear optics research since its demonstration as an ultralow-loss integrated photonics platform. Due to its significant quadratic nonlinearity (χ (2) ), LN inspires many important applications such as second-harmonic generation (SHG), spontaneous parametric down-conversion, and optical parametric oscillation. Here, we demonstrate high-efficiency SHG in dual-resonant, periodically poled z-cut LN microrings, where quasi-phase matching is realized by field-assisted domain engineering. Meanwhile, dual-band operation is accessed by optimizing the coupling conditions in fundamental and second-harmonic bands via a single pulley waveguide. As a result, when pumping a periodically poled LN microring in the low power regime at around 1617 nm, an on-chip SHG efficiency of 250,000 %/W is achieved, a state-of-the-art value reported among current integrated photonics platforms. An absolute conversion efficiency of 15% is recorded with a low pump power of 115 µW in the waveguide. Such periodically poled LN microrings also present a versatile platform for other cavity-enhanced quasi-phase matched χ (2) nonlinear optical processes.

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“…Our result suggests that chirp-modulated adiabatic waveguides are important media for ultrafast nonlinear optics with less susceptibility to the degraded pulse peak power with the propagation distance. The approach can be also adopted to other non-centrosymmetric waveguide materials such as lithium niobate [24], gallium nitride [41], and gallium phosphide [42] by taking full advantage of their intrinsic χ (2) and χ (3) nonlinearities.…”

Section: Discussionmentioning

confidence: 99%

Beyond 100 THz-spanning ultraviolet frequency combs in a non-centrosymmetric crystalline waveguide

Liu

Bruch

et al. 2019

Nat Commun

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Ultraviolet frequency combs enable applications ranging from precision spectroscopy to atomic clocks by addressing electronic transitions of atoms and molecules. Access to ultraviolet light via integrated nonlinear optics is usually hampered by the strong material dispersion and large waveguide attention in ultraviolet regions. Here we demonstrate a simple route to chip-scale ultraviolet comb generators, simultaneously showing a gap-free frequency span of 128 terahertz and high conversion efficiency. This process relies on adiabatic quadratic frequency translation of a near-visible supercontinuum sourced by an ultrafast fiber laser. The simultaneous cubic and quadratic nonlinear processes are implemented in single-crystalline aluminum nitride thin films, where chirp-modulated taper waveguides are patterned to ensure a broad phase matching. The heterodyne characterization suggests that both the near-visible and ultraviolet supercontinuum combs maintain high coherence. Our approach is also adaptable to other non-centrosymmetric photonic platforms for ultrafast nonlinear optics with scalable bandwidth.

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Phase-matched second harmonic generation with on-chip GaN-on-Si microdisks

Cited by 65 publications

References 43 publications

Efficient continuous-wave nonlinear frequency conversion in high-Q gallium nitride photonic crystal cavities on silicon

Efficient continuous-wave nonlinear frequency conversion in high-Q gallium nitride photonic crystal cavities on silicon

Periodically poled thin-film lithium niobate microring resonators with a second-harmonic generation efficiency of 250,000%/W

Beyond 100 THz-spanning ultraviolet frequency combs in a non-centrosymmetric crystalline waveguide

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