On December 14th, Roberto Osellame participated to the event “CNR in the future”, an online round table organized in order to share ideas and experiences between CNR researchers and some of the members of the Italian Parliament. The Italian Minister of the Research Gaetano Manfredi was present and participated to the discussion.
Our work on microstructured integrated photonic circuits fabricated by femtosecond laser micromachining is displayed on the journal cover of Laser & Photonics Reviews .
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.
Simone Atzeni is giving an invited talk at Young Italian Quantum Information Science Conference (YIQIS) 2020 on Monday 28 September about ‘Structured glass for low power actuation of thermal phase shifters’.
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.
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).
Declaration signed by 300 researchers who have received ERC funding in favor of the European Research Council (ERC): an essential tool, whose key principles are autonomy and excellence, for both Italian and European research.
Roberto Osellame is giving an invited talk at SPIE Photonics Europe 2020 on Wednesday 1 April about ‘Integrated quantum photonics: advanced architectures using 3D laser writing’.
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.
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.