Research Laboratory of Electronics, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA
Neetesh Singh (neeteshs@mit.edu)
纸质出版日期:2020,
网络出版日期:2020-02-06,
收稿日期:2019-12-27,
修回日期:2020-01-17,
录用日期:2020-01-23
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Broadband 200-nm second-harmonic generation in silicon in the telecom band[J]. LSA, 2020,9(1):151-157.
Singh, N. et al. Broadband 200-nm second-harmonic generation in silicon in the telecom band. Light: Science & Applications, 9, 151–157 (2020).
Broadband 200-nm second-harmonic generation in silicon in the telecom band[J]. LSA, 2020,9(1):151-157. DOI: 10.1038/s41377-020-0254-7.
Singh, N. et al. Broadband 200-nm second-harmonic generation in silicon in the telecom band. Light: Science & Applications, 9, 151–157 (2020). DOI: 10.1038/s41377-020-0254-7.
Silicon is well known for its strong third-order optical nonlinearity
exhibiting efficient supercontinuum and four-wave mixing processes. A strong second-order effect that is naturally inhibited in silicon can also be observed
for example
by electrically breaking the inversion symmetry and quasi-phase matching the pump and the signal. To generate an efficient broadband second-harmonic signal
however
the most promising technique requires matching the group velocities of the pump and the signal. In this work
we utilize dispersion engineering of a silicon waveguide to achieve group velocity matching between the pump and the signal
along with an additional degree of freedom to broaden the second harmonic through the strong third-order nonlinearity. We demonstrate that the strong self-phase modulation and cross-phase modulation in silicon help broaden the second harmonic by 200 nm in the O-band. Furthermore
we show a waveguide design that can be used to generate a second-harmonic signal in the entire near-infrared region. Our work paves the way for various applications
such as efficient and broadband complementary-metal oxide semiconductor based on—chip frequency synthesizers
entangled photon pair generators
and optical parametric oscillators.
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