Publications by Davide Grassani

Related publications (32)

Arbitrarily high time bandwidth performance in a nonreciprocal optical resonator with broken time invariance

Camille Sophie Brès, Hatice Altug, Davide Grassani, Simon Julien Fabbri, Kosmas Tsakmakidis, Ivan Cardea

Most present-day resonant systems, throughout physics and engineering, are characterized by a strict time-reversal symmetry between the rates of energy coupled in and out of the system, which leads to a trade-off between how long a wave can be stored in th ...

Nature Research2020

Characterization and modeling of microstructured chalcogenide fibers for efficient mid-infrared wavelength conversion

Camille Sophie Brès, Davide Grassani, Svyatoslav Kharitonov, Adrien Billat, Sida Xing

We experimentally demonstrate wavelength conversion in the 2 μm region by four-wave mixing in an AsSe and a GeAsSe chalcogenide photonic crystal fibers. A maximum conversion efficiency of −25.4 dB is measured for 112 mW of coupled continuous wave pump in a ...

Optical Society of America2016

Mid-infrared frequency comb via coherent dispersive wave generation in silicon nitride nanophotonic waveguides

Tobias Kippenberg, Camille Sophie Brès, Martin Hubert Peter Pfeiffer, Hairun Guo, Wenle Weng, Davide Grassani, Adrien Billat

Mid-infrared optical frequency combs are of significant interest for molecular spectroscopy due to the large absorption of molecular vibrational modes on the one hand, and the ability to implement superior comb-based spectroscopic modalities with increased ...

Nature Publishing Group2018

Energy correlations of photon pairs generated by a silicon microring resonator probed by Stimulated Four Wave Mixing

Matteo Galli, Christophe Marcel Georges Galland, Davide Grassani

Compact silicon integrated devices, such as micro-ring resonators, have recently been demonstrated as efficient sources of quantum correlated photon pairs. The mass production of integrated devices demands the implementation of fast and reliable techniques ...

Nature Research2016

Enhancing Optical Nonlinear Processes Performance of Silicon Nitride Waveguides

Camille Sophie Brès, Davide Grassani, Eirini Tagkoudi

Silicon nitride has recently attracted significant interest for nonlinear integrated optics. In addition to its excellent linear properties, silicon nitride offers a bandgap larger than silicon, and a wide transparency window spanning from the visible all ...

IEEE2018

Integrated Source of Spectrally Filtered Correlated Photons for Large-Scale Quantum Photonic Systems

Matteo Galli, Christophe Marcel Georges Galland, Davide Grassani

We demonstrate the generation of quantum-correlated photon pairs combined with the spectral filtering of the pump field by more than 95 dB on a single silicon chip using electrically tunable ring resonators and passive Bragg reflectors. Moreover, we perfor ...

American Physical Society2014

Formation Rules and Dynamics of Photoinduced χ(2) Gratings in Silicon Nitride Waveguides

Tobias Kippenberg, Camille Sophie Brès, Martin Hubert Peter Pfeiffer, Davide Grassani, Edgars Nitiss, Tianyi Liu

Silicon nitride has emerged as a prominent platform for building photonics integrated circuits. While its nonlinear properties based on third-order effects have been successfully exploited, an efficient second harmonic generation in standard stoichiometric ...

2020

Second- and third-order nonlinear wavelength conversion in an all-optically poled Si3N4 waveguide

Tobias Kippenberg, Camille Sophie Brès, Martin Hubert Peter Pfeiffer, Davide Grassani

Silicon nitride (Si3N4) is commonly employed to integrate third-order nonlinear optical processes on a chip. Its amorphous state, however, inhibits significant second-order nonlinear response. Recently, second-harmonic generation enhancement has been obser ...

2019

Unconventional time-bandwidth performance of resonant cavities with nonreciprocal coupling

Camille Sophie Brès, Davide Grassani, Kosmas Tsakmakidis, Ivan Cardea

The time-bandwidth limit is a mathematical tenet that affects all reciprocal resonators, stating that the product of the spectral bandwidth that can couple into a resonant system and its characteristic energy decay time is always equal to 1. Here, we devel ...

2021

Gas spectroscopy using low threshold mid-infrared radiation generated in Si3N4 waveguides

Tobias Kippenberg, Camille Sophie Brès, Hairun Guo, Davide Grassani, Fan Yang, Eirini Tagkoudi

We report trace-gas absorption spectroscopy based on the efficient generation of a 3.05μm dispersive wave in a Si3N4 waveguide pumped by a 2.09 μm femtosecond mode-locked fiber laser ...

OSA Publishing2019

MIR supercontinuum in all-normal dispersion Chalcogenide photonic crystal fibers pumped with 2μm femtosecond laser

Camille Sophie Brès, Jianqi Hu, Davide Grassani, Svyatoslav Kharitonov, Sida Xing

We demonstrate mid-infrared supercontinuum generation in an all-normal dispersion Chalcogenide PCF pumped by fiber laser. The -20dB bandwidth is 1.7~2.7μm dominated by self-phase modulation and optical wave breaking. Tapering is proposed to improve perform ...

OSA2017

Large second harmonic generation enhancement in Si3N4 waveguides by all-optically induced quasiphase- matching

Tobias Kippenberg, Camille Sophie Brès, Martin Hubert Peter Pfeiffer, Davide Grassani, Svyatoslav Kharitonov, Adrien Billat

Efficient second harmonic generation in integrated platforms is usually achieved by resonant structures, intermodal phase-matching or quasi-phase matching by periodically poling ferroelectric waveguides. However, in all these structures, it is impossible t ...

Nature Research2017

All-optically induced quasi phase matching in SiN waveguides for second harmonic generation enhancement

Tobias Kippenberg, Camille Sophie Brès, Martin Hubert Peter Pfeiffer, Davide Grassani, Svyatoslav Kharitonov, Adrien Billat

We report more than 30dB second harmonic generation enhancement in SiN waveguide by all-optical writing of a persistent χ(2) grating. Phase matching peaks are observed for different writing wavelengths. ...

OSA Publishing2017

All-fibered chalcogenide based continuous-wave parametric amplification in the mid-infrared

Camille Sophie Brès, Davide Grassani, Svyatoslav Kharitonov, Sida Xing

We demonstrate parametric amplification around 2 μm in a dispersion engineered tapered microstructured chalcogenide fiber. Almost 5 dB of signal amplification was achieved by 125 mW coupled power from a thulium-doped fiber pump laser. ...

OSA Publishing2017

Mid infrared gas spectroscopy using efficient fiber laser driven photonic chip-based supercontinuum

Tobias Kippenberg, Camille Sophie Brès, Hairun Guo, Davide Grassani, Fan Yang, Eirini Tagkoudi

Directly accessing the middle infrared, the molecular functional group spectral region, via supercontinuum generation processes based on turn-key fiber lasers offers the undeniable advantage of simplicity and robustness. Recently, the assessment of the coh ...

Nature Research2019

Parallel gas spectroscopy using mid-infrared supercontinuum from a single Si3N4 waveguide

Tobias Kippenberg, Camille Sophie Brès, Davide Grassani, Fan Yang, Eirini Tagkoudi

Efficient third-order nonlinear optical processes have been successfully integrated on silicon nitride (Si3N4) waveguides. In particular, owing to Si3N4 wide transparency window spanning from the visible to the middle-infrared (mid-IR), efficient mid-IR di ...

2020

A chip-based silicon nitride platform for mid-infrared nonlinear photonics

Tobias Kippenberg, Camille Sophie Brès, Martin Hubert Peter Pfeiffer, Hairun Guo, Davide Grassani, Michail Zervas, Adrien Billat

We developed a chip-based silicon nitride platform with thick waveguides (> 2 mm) that overcomes the usual fabrication limitation. We demonstrate both microresonator frequency comb generation at 2:5 mm and supercontinuum generation extending beyond 4:0 mm ...

OSA Publishing2017

Optically Probed Time Dynamics of χ(2) Grating Inscription in SiN Waveguides

Tobias Kippenberg, Camille Sophie Brès, Davide Grassani, Edgars Nitiss, Tianyi Liu

Silicon Nitride (S13N4) waveguide platforms have seen significant interest in the recent years, motivated by several advantageous properties such as compatibility with CMOS fabrication standards, low propagation loss, high refractive index and optical nonl ...

2019

Multi-gas spectroscopy using tailored mid-IR dispersive wave generated in Si3N4 waveguide

Camille Sophie Brès, Davide Grassani, Fan Yang, Eirini Tagkoudi

We demonstrate simultaneous detection of acetylene, methane and ethane using milliwatt-level dispersive-wave generated in a Si3N4 waveguide covering 2900 cm-1-3380 cm-1 spectral region. This simple mid-IR absorption spectroscopy scheme achieves hundreds of ...

2021

Observation of Second Harmonic and Sum Frequency in an Optically Poled Si3N4 Waveguide

Tobias Kippenberg, Camille Sophie Brès, Martin Hubert Peter Pfeiffer, Davide Grassani, Adrien Billat

Enhanced second order nonlinear processes in a Si3N4 waveguide following optically induced χ(2) is demonstrated, enabling the detection of a frequency doubled pulsed train and SFG with >-37 dB conversion efficiency for 18 W pump peak power. ...

2018