Hybrid silicon nonlinear photonics [Invited]

Li, Ming; Zhang, Lin; Tong, Limin; Dai, Daoxin

doi:10.1364/prj.6.000b13

Cited by 35 publications

(18 citation statements)

References 99 publications

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“…The meta-silicon-material has led to various unexpected optical properties, e.g., Mie-resonance-induced localization as well as electric/magnetic dipole/multipoles 4 , optical magnetism 10 , directional emission 11 , broadband perfect reflector 12 , high-efficiency hologram 13 , optical topological states 14 , and multicolor nano-display 15 . Nanostructured Si also displayed many unusual optical control 16 , 17 or nonlinearity mechanisms 18 . For example, Si metasurfaces can be applied for fabrication of ultracompact phase controllers 17 , several order-of-magnitude enhancement in third harmonic generation 19 , 20 , and two-photon absorption 21 .…”

Section: Introductionmentioning

confidence: 99%

Giant photothermal nonlinearity in a single silicon nanostructure

et al. 2020

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Silicon photonics have attracted significant interest because of their potential in integrated photonics components and all-dielectric meta-optics elements. One major challenge is to achieve active control via strong photon–photon interactions, i.e. optical nonlinearity, which is intrinsically weak in silicon. To boost the nonlinear response, practical applications rely on resonant structures such as microring resonators or photonic crystals. Nevertheless, their typical footprints are larger than 10 μm. Here, we show that 100 nm silicon nano-resonators exhibit a giant photothermal nonlinearity, yielding 90% reversible and repeatable modulation from linear scattering response at low excitation intensities. The equivalent nonlinear index is five-orders larger compared with bulk, based on Mie resonance enhanced absorption and high-efficiency heating in thermally isolated nanostructures. Furthermore, the nanoscale thermal relaxation time reaches nanosecond. This large and fast nonlinearity leads to potential applications for GHz all-optical control at the nanoscale and super-resolution imaging of silicon.

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Section: Introductionmentioning

confidence: 99%

Giant photothermal nonlinearity in a single silicon nanostructure

et al. 2020

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“…These questions are important not only for deepening our understanding of dispersion engineering principle but also for practical applications. For example, middle infrared (mid-IR, from 2.5 to 20 μm, i.e., three octaves) is of particular interest recently [6,[27][28][29][30], and on-chip mid-IR photonics [5,7,[31][32][33][34][35][36] is intensively investigated. A research focus is to produce supercontinua [6,[31][32][33] and broadband frequency combs [5,34,35] for spectroscopy/sensing and imaging applications [37,38].…”

Section: Introductionmentioning

confidence: 99%

Ultra-flat dispersion in an integrated waveguide with five and six zero-dispersion wavelengths for mid-infrared photonics

Guo

Jafari

et al. 2019

Photon. Res.

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We propose a new type of dispersion flattening technology, which can generate an ultra-flat group velocity dispersion profile with five and six zero-dispersion wavelengths (ZDWs). The dispersion value varies from −0.15 to 0.35 ps/(nm•km) from 4 to 8 μm, which to the best of our knowledge is the flattest one reported so far, and the dispersion flatness is improved by more than an order of magnitude. We explain the principle of producing six ZDWs. Mode distribution in this waveguide is made stable over a wide bandwidth. General guidelines to systematically control the dispersion value, sign, and slope are provided, and one can achieve the desired dispersion by properly adjusting the structural parameters. Fabrication tolerance of this waveguide is also examined.

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“…The LCOS SLM technology is a promising candidate for the so-called structured light where the optical field amplitude, phase, and polarization can be controlled spatially while the time and frequency spectrum can be controlled temporally [3]. Nonlinear silicon photonics can be used in on-chip optical signal processing and computation due to its low cost and compatibility with CMOS technology [5]. The development of nonlinear silicon photonics is limited by the absence of the second-order nonlinear susceptibility χ()2 due to centrosymmetric structure of Si, comparatively low third-order nonlinear susceptibility χ()3, the two-photon absorption (TPA) and free carrier absorption (FCA) [5].…”

Section: Introductionmentioning

confidence: 99%

“…To mitigate these disadvantages new materials with better nonlinear properties may be integrated with silicon. In such a case, the new materials may improve the nonlinearity of an optical device while silicon can confine the optical modes to nanoscale [5]. The organic nonlinear materials with a large χ()3 can be used for the creation of a silicon-organic hybrid waveguide [5].…”

Section: Introductionmentioning

confidence: 99%

“…In such a case, the new materials may improve the nonlinearity of an optical device while silicon can confine the optical modes to nanoscale [5]. The organic nonlinear materials with a large χ()3 can be used for the creation of a silicon-organic hybrid waveguide [5]. In particular, liquid crystals (LCs) may be used as a waveguide core where the modulation and switching of photonic signals is possible by using electro-optic or nonlinear optic effects [1,6,7,8,9,10,11,12,13].…”

Section: Introductionmentioning

confidence: 99%

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Nonlinear Optical Phenomena in a Silicon-Smectic A Liquid Crystal (SALC) Waveguide

2019

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Liquid crystals (LCs) are organic materials characterized by the intermediate properties between those of an isotropic liquid and a crystal with a long range order. The LCs possess strong anisotropy of their optical and electro-optical properties. In particular, LCs possess strong optical nonlinearity. LCs are compatible with silicon-based technologies. Due to these unique properties, LCs are promising candidates for the development of novel integrated devices for telecommunications and sensing. Nematic liquid crystals (NLCs) are mostly used and studied. Smectic A liquid crystals (SALCs) have a higher degree of long range order forming a layered structure. As a result, they have lower scattering losses, specific mechanisms of optical nonlinearity related to the smectic layer displacement without the mass density change, and they can be used in nonlinear optical applications. We theoretically studied the nonlinear optical phenomena in a silicon-SALC waveguide. We have shown theoretically that the stimulated light scattering (SLS) and cross-phase modulation (XPM) caused by SALC nonlinearity can occur in the silicon-SALC waveguide. We evaluated the smectic layer displacement, the SALC hydrodynamic velocity, and the slowly varying amplitudes (SVAs) of the interfering optical waves.

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Hybrid silicon nonlinear photonics [Invited]

Cited by 35 publications

References 99 publications

Giant photothermal nonlinearity in a single silicon nanostructure

Giant photothermal nonlinearity in a single silicon nanostructure

Ultra-flat dispersion in an integrated waveguide with five and six zero-dispersion wavelengths for mid-infrared photonics

Nonlinear Optical Phenomena in a Silicon-Smectic A Liquid Crystal (SALC) Waveguide

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