Second-order nonlinear optical behavior of amorphous SiO<sub><i>x</i></sub>thin films grown by sputtering

Kawamura, Ibuki; Imakita, Kenji; Kitao, Akihiro; Fujii, Minoru

doi:10.1088/0022-3727/48/39/395101

Cited by 2 publications

(2 citation statements)

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“…[10][11][12][13] Additionally, CMOScompatible dielectric materials such as aluminum oxide (Al 2 O 3 ), silicon dioxide (SiO 2 ), and silicon nitride (SiN x ) are reported to have extremely low v (2) because of their amorphous nature. [14][15][16] Therefore, the need for CMOS-compatible materials exhibiting prominent v (2) that can be easily integrated with modern silicon photonic material platforms is highly desirable.…”

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confidence: 99%

Synthesis of second-order nonlinearities in dielectric-semiconductor-dielectric metamaterials

Lin

Yang

Sharma

et al. 2017

Applied Physics Letters

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We demonstrate a large effective second-order nonlinear optical susceptibility in electronic optical metamaterials based on sputtered dielectric-semiconductor-dielectric multilayers of silicon dioxide/amorphous silicon (a-Si)/aluminum oxide. The interfacial fixed charges (Q f) with opposite signs on either side of dielectric-semiconductor interfaces result in a non-zero built-in electric field within the a-Si layer, which couples to the large third-order nonlinear susceptibility tensor of a-Si and induces an effective second-order nonlinear susceptibility tensor v eff (2). The value of the largest components of the effective v eff (2) tensor, i.e., v (2) zzz , is determined experimentally to be 2 pm/V for the as-fabricated metamaterials and increases to 8.5 pm/V after the post-thermal annealing process. The constituents and fabrication methods make these metamaterials CMOS compatible, enabling efficient nonlinear devices for chip-scale silicon photonic integrated circuits.

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confidence: 99%

Synthesis of second-order nonlinearities in dielectric-semiconductor-dielectric metamaterials

Lin

Yang

Sharma

et al. 2017

Applied Physics Letters

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“…As a matter of fact, there have been some investigations about SHG of amorphous films or microcavities, but the origin is ambiguous [15,16,29,30]. Different from the situations in other amorphous structures derived from strain generated at the interface between structures and substrates, we attribute the SHG process from submicron a-Se spheres to the finity of the medium.…”

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confidence: 86%

Second harmonic generation from an individual amorphous selenium nanosphere

Yan²,

Wei³

et al. 2016

Nanotechnology

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Among the numerous nonlinear optics effects, second harmonic generation (SHG) is always a hotspot and it is extensively used for optical frequency conversion, biomedical imaging, etc. However, SHG is forbidden in a medium with inversion symmetry under the electric-dipole approximation. Here, we demonstrated SHG from a single amorphous selenium (a-Se) nanosphere under near-infrared femtosecond pulse excitation. It was found that SH spectra are tunable with the size of a-Se nanospheres and the SHG efficiency of a single a-Se sphere with a diameter over 300 nm is estimated at 10(-8). We also established two physical mechanisms of SHG from the amorphous nanospheres. There is an electric-dipole contribution to the second-order nonlinearity in view of the inevitable structural discontinuity at the surface. The discontinuity of the normal component of the electric field strength leads to the quadrupole-type contributions arising from the large electric field gradient. The SHG process can be enhanced by resonance near the fundamental wavelength, giving rise to the detectable second harmonic (SH) spectra of a single a-Se nanosphere (d > 300 nm) or two small a-Se nanospheres (d = 200 nm) aggregated into a dimer, while the single nanosphere with smaller size (d > 300 nm) is undetectable. As an essential trace element for animals, a-Se features unique biological compatibility and has specific properties of optical nonlinearity within the optical window in biological tissue. This discovery makes a-Se nanospheres promising both in nonlinear optics and biomedicine.

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Second-order nonlinear optical behavior of amorphous SiO_xthin films grown by sputtering

Cited by 2 publications

References 47 publications

Synthesis of second-order nonlinearities in dielectric-semiconductor-dielectric metamaterials

Synthesis of second-order nonlinearities in dielectric-semiconductor-dielectric metamaterials

Second harmonic generation from an individual amorphous selenium nanosphere

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Second-order nonlinear optical behavior of amorphous SiOxthin films grown by sputtering

Cited by 2 publications

References 47 publications

Synthesis of second-order nonlinearities in dielectric-semiconductor-dielectric metamaterials

Synthesis of second-order nonlinearities in dielectric-semiconductor-dielectric metamaterials

Second harmonic generation from an individual amorphous selenium nanosphere

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Second-order nonlinear optical behavior of amorphous SiO_xthin films grown by sputtering