Published paper in Laser & Photonics Reviews on October 2020

Femtosecond laser micromachining allows rapid and cost‐effective fabrication of thermally‐reconfigurable photonic integrated circuits with unique 3D geometries. Here we exploit thermally‐insulating 3D microstructures to decrease the power needed to induce a 2π phase shift down to 37 mW and to reduce the thermal crosstalk to a few percent for an inter‐waveguide separation down to 80 μm.

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Published paper in Optics Express on August 2020

In this work we demonstrate novel integrated-optics modulators and switches, realized in a glass substrate by femtosecond laser pulses. These devices are based on oscillating microcantilevers, machined by water-assisted laser ablation. Operation frequencies are in the range of tens of kilohertz, thus they markedly overcome the response-time limitation of other glass-based modulators, which rely on the thermo-optic effect.

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Published paper in Scientific Reports on April 2020

We propose and demonstrate an on-chip optofluidic device allowing active oscillatory microrheological measurements with sub-μL sample volume, low cost and high flexibility. The core elements of the optical part, integrated waveguides and an optical modulator, are fabricated by fs-laser writing on a glass substrate. The system performance is validated by measuring viscoelastic solutions of aqueous worm-like micelles composed by Cetylpyridinium Chloride (CPyCl) and Sodium Salicylate (NaSal).

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Published paper in Optical Materials: X on December 2019

Femtosecond Laser Irradiation followed by Chemical Etching (FLICE) is a powerful technique for prototyping three-dimensional structures in glass. Here we show that it is possible to apply FLICE also to a commercial alumino-borosilicate glass, where very complex and low-loss photonic circuitry has been demonstrated recently. As a test for the technique, we realize an optofluidic device composed of a microchannel and two intersecting optical waveguides.

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Published paper in Optica on December 2019

Scaling-up optical quantum technologies requires a combination of highly efficient multi-photon sources and integrated waveguide components. Here, we interface these scalable platforms, demonstrating high-rate three-photon interference with a quantum dot based multi-photon source and a reconfigurable photonic chip on glass. We show that this combination of scalable sources and reconfigurable photonic circuits compares favorably in performance with respect to previous implementations and that merging these platforms could allow 10-photon experiments on chip at ∼40 s−1 rate in a foreseeable future.

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