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Broadband 200-nm second-harmonic generation in silicon in the telecom band

Light(Science & Applications) 2020年第1期9卷 1844-1850页

作者： neetesh singh Manan Raval Alfonso Ruocco Michael R.Watts Research Laboratory of Electronics Massachusetts Institute of Technology77 Massachusetts AvenueCambridgeMA 02139USA

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 *** generate an efficient broadband second-harmonic signal,however,the most promising technique requires matching the group velocities of the pump and the *** 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 *** demonstrate that the strong self-phase modulation and cross-phase modulation in silicon help broaden the second harmonic by 200 nm in the ***,we show a waveguide design that can be used to generate a second-harmonic signal in the entire nearinfrared *** work paves the way for various applications,such as efficient and broadband complementarymetal oxide semiconductor based on-chip frequency synthesizers,entangled photon pair generators,and optical parametric oscillators.

关键词： waveguide synthesizer harmonic

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Optical frequency synthesizer with an integrated erbium tunable laser

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Light(Science & Applications) 2019年第1期8卷 22-29页

作者： Ming Xin Nanxi Li neetesh singh Alfonso Ruocco Zhan Su Emir Salih Magden Jelena Notaros Diedrik Vermeulen Erich P.Ippen Michael R.Watts Franz X.Kartner Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMA 02139USA John A.Paulson School of Engineering and Applied Science Harvard UniversityCambridgeMA 02138USA Center for Free-Electron Laser Science DESY and Hamburg UniversityNotkestraße 8522607 HamburgGermany Institute of Microelectronics Agency for ScienceTechnology and Research(A*STAR)138634 SingaporeSingapore Analog Photonics 1 Marina Park DriveBostonMA 02210USA Department of Electrical and Electronics Engineering Koc UniversitySarıyerIstanbul 34450Turkey

Optical frequency synthesizers have widespread applications in optical spectroscopy,frequency metrology,and many other ***,their applicability is currently limited by size,cost,and power *** photonics technology,which is compatible with complementary-metal-oxide-semiconductor fabrication processes,provides a low-cost,compact size,lightweight,and low-power-consumption *** this work,we demonstrate an optical frequency synthesizer using a fully integrated silicon-based tunable *** synthesizer can be self-calibrated by tuning the repetition rate of the internal mode-locked laser.A 20 nm tuning range from 1544 to 1564 nm is achieved with~10−13 frequency instability at 10 s averaging *** flexibility and fast reconfigurability are also demonstrated by fine tuning the synthesizer and generating arbitrary specified patterns over time-frequency *** work promotes the frequency stability of silicon-based integrated tunable lasers and paves the way toward chip-scale lowcost optical frequency synthesizers.

关键词： synthesizer tunable tuning

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Nonlinear silicon photonics on CMOS-compatible tellurium oxide

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Photonics Research 2020年第12期8卷 1904-1909页

作者： neetesh singh HAMIDU M.MBONDE HENRY C.FRANKIS ERICH IPPEN JONATHAN D.B.BRADLEY FRANZ X.KÄRTNER Centre for Free Electron Laser Science(CFEL)-DESY and University of Hamburg 22607 HamburgGermany Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMassachusetts 02139USA Department of Engineering Physics McMaster UniversityHamiltonOntario L8S 4L7Canada

Silicon photonics is coming of age;however,it is still lacking a monolithic platform for optical sources and nonlinear functionalities prompting heterogeneous integration of different materials tailored to different *** we demonstrate tellurium oxide as a complementary metal oxide semiconductor silicon photonics platform for nonlinear functionalities,which is already becoming an established platform for sources and *** show broadband supercontinuum generation covering the entire telecom window and show for the first time to our knowledge third-harmonic generation in its integrated *** with the nowavailable lasers and amplifiers on integrated Te O_(2) this work paves the way for a monolithic TeO_(2)-based nonlinear silicon photonics platform.

关键词： oxide Together prompt

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Octave-spanning coherent supercontinuum generation in silicon on insulator from 1.06μm to beyond 2.4μm

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Light(Science & Applications) 2017年第1期6卷 235-242页

作者： neetesh singh Ming Xin Diedrik Vermeulen Katia Shtyrkova Nanxi Li Patrick T Callahan Emir Salih Magden Alfonso Ruocco Nicholas Fahrenkopf Christopher Baiocco Bill P-P Kuo Stojan Radic Erich Ippen Franz X Kärtner Michael R Watts Research Laboratory of Electronics Massachusetts Institute of TechnologyCambridgeMA 02139USA John A.Paulson School of Engineering and Applied Science Harvard UniversityCambridgeMA 02138USA College of Nanoscale Science and Engineering SUNY Polytechnic InstituteAlbanyNY 12203USA Department of Electrical and Computer Engineering University of California San DiegoLa JollaCA 92039USA Centre for Free Electron Laser Science(CFEL)-DESY and University of Hamburg Hamburg 22607Germany

Efficient complementary metal-oxide semiconductor-based nonlinear optical devices in the near-infrared are in strong *** to two-photon absorption in silicon,however,much nonlinear research is shifting towards unconventional photonics *** this work,we demonstrate the generation of an octave-spanning coherent supercontinuum in a silicon waveguide covering the spectral region from the near-to *** input pulses of 18 pJ in energy,the generated signal spans the wavelength range from the edge of the silicon transmission window,approximately 1.06 to beyond 2.4μm,with a−20 dB bandwidth covering 1.124–2.4μ*** octave-spanning supercontinuum was also observed at the energy levels as low as 4 pJ(−35 dB bandwidth).We also measured the coherence over an octave,obtaining|g_()12^(1)(λ)>90%,in good agreement with the *** addition,we demonstrate optimization of the third-order dispersion of the waveguide to strengthen the dispersive wave and discuss the advantage of having a soliton at the long wavelength edge of an octave-spanning signal for nonlinear *** research paves the way for applications,such as chip-scale precision spectroscopy,optical coherence tomography,optical frequency metrology,frequency synthesis and wide-band wavelength division multiplexing in the telecom window.

关键词： coherence integrated photonics silicon supercontinuum

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Toward mid-infrared nonlinear optics applications of silicon carbide microdisks engineered by lateral under-etching[Invited]

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Photonics Research 2018年第5期6卷 I0099-I0106页

作者： DAVID ALLIOUX ALI BELAROUCI DARREN HUDSON ERIC MAGI MILAN SINOBAD GUILLAUME BEAUDIN ADRIEN MICHON neetesh singh REGIS OROBTCHOUK CHRISTIAN GRILLET Universite de Lyon Institut des Nanotechnologie de Lyon69131 EcullyFrance Department of Electrical Engineering Universite de SherbrookeSherbrookeQC JIK 2R1Canada School of Physics University of SydneySydneyNSW 2006Australia RMIT School of Electrical and Computer Engineering MelbourneVlC 3000Australia Universite Cote d'Azur CNRSCRHEAFrance

We report the fabrication and characterization of silicon carbide microdisks on top of silicon pillars suited for applications from near-to mid-infrared. We probe 10 μm diameter disks with different under-etching depths,from 4 μm down to 1.4 μm, fabricated by isotropic plasma etching and extract quality factors up to 8400 at telecom wavelength. Our geometry is suited to present high Q single-mode operation. We experimentally demonstrate high-order whispering-gallery mode suppression while preserving the fundamental gallery mode and investigate some requirements for nonlinear optics applications on this platform, specifically in terms of quality factor and dispersion for Kerr frequency comb generation.

关键词： Toward mid-infrared nonlinear optics applications silicon carbide microdisks engineered by lateral under-etching

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