Dr. Ciro d'Amico Profile

Dr. Ciro d'Amico

Associate Professor at Lab Hubert Curien

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Author

Publications (5)

Proceedings Article | 26 August 2024 Poster + Paper

FIRST 5T 3D: interferometric performances of a laser written bream combiner for FIRST/SUBARU

G. Martin, K. Barjot, M. Lallement, H. Kenchington-Smith, E. Huby, S. Lacour, C. d'Amico, R. Stoian, S. Vievard, O. Guyon, V. Deo, G. Zhang, G. Cheng

Proceedings Volume 13100, 131007C (2024) https://doi.org/10.1117/12.3019221

KEYWORDS: Waveguides, Microelectromechanical systems, Beam combiners, Binary stars, Photonic integrated circuits, Laser interferometry, Crosstalk, Telescopes, Laser optics, Equipment

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FIRST (Fibered Imager foR a Single Telescope instrument) is an on-sky instrument at SUBARU Telescope that enables high-contrast imaging and spectroscopy, thanks to a unique combination of pairwise combination of sub-apertures using a Photonic Integrated Circuit that allows spatial filtering by single-mode waveguides and cross-dispersion in the visible (~ 600-800 nm), a high-efficiency alternative to sparse aperture masking. To reduce crosstalk observed in planar PICs, and therefore increase the instrument’s stability and sensitivity, we have designed and fabricated a series of 3D laserwritten optical PICs with 5T beam combiners. Different laser powers were used to address different single-mode spectral ranges. The multi-aperture beam combiner consists of five input waveguides spaced by 250 μm. Each input is split into four waveguides and the twenty channels undergo pairwise recombination, using Y-junctions, to produce ten outputs. In this work, we present the interferometric performances of these 3D PICs when exposed to a point-like light source (single star) or a two-points-like light source (binary) on the FIRST/SUBARU instrument replica built at LESIA – Observatoire de Paris.

In previous work, we identified the optimal 5T 3D device, as being single-mode between 550-800 nm and showing good internal transmission in all input channels, above 45% at 635nm. The internal transmission (sum of the output values obtained for the four waveguides of the 1x4 splitter as normalized to the output signal obtained from the straight waveguide used as a reference) was measured. Two inputs achieved 80% transmission. The PIC was installed in the FIRST/SUBARU optical bench simulator at LESIA, to inject light into five inputs simultaneously and scan the fringes using independent MEMS segments, inducing a relative OPD modulation. The results of this study, comparing the signature obtained for a single source (star) as compared to a binary, will be presented in this work. We will show that both polarizations are guided, with no crosstalk, and analyze the interferometric performances as a function of the source type, showing that the binary companion can be detected.

Proceedings Article | 20 June 2024 Presentation

Dynamics of ultrafast laser nanostructuring in bulk sapphire in non-diffractive mode: a micro-explosion in slow motion

Rajeev Dwivedi, Huu Dat Nguyen, Thirunaukkarasu Kuppan, Ciro d'Amico, Razvan Stoian

Proceedings Volume PC13005, PC130050R (2024) https://doi.org/10.1117/12.3017189

KEYWORDS: Sapphire, Ultrafast lasers, Laser nanostructuring, Ultrafast phenomena, Bessel beams, Phase contrast, Industrial applications, Crystals, Scientific research, Process control

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Proceedings Article | 29 August 2022 Poster + Paper

FIRST 5T 3D: a laser written device for FIRST/SUBARU reducing crosstalk and propagation losses

G. Martin, A. Morand, C. d'Amico, R. Stoian, K. Barjot, M. Lallement, N. Cvetojevic, S. Vievard, E. Huby, S. Lacour, V. Deo, O. Guyon, J. Lv, G. Zhang, G. Cheng

Proceedings Volume 12188, 121882T (2022) https://doi.org/10.1117/12.2630010

KEYWORDS: Waveguides, Telescopes, Microelectromechanical systems, Laser optics, Interferometry, Modulation, Wave propagation, Visible radiation, Polarization, Optical simulations

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FIRST (Fibered Imager foR a Single Telescope instrument) is an instrument that enables high contrast imaging and spectroscopy, thanks to a unique combination of sparse aperture masking, spatial filtering by single-mode waveguides and cross-dispersion in the visible. In order to increase the instrument’s stability and sensitivity, we have designed and fabricated a 3D laser-written optical chip 5T beam combiner. The multi-aperture beam combiner consists of 5 input waveguides spaced by 250um. Each input is split into 4 waveguides. A pairwise recombination scheme with Yjunctions produces/leads to 10 outputs (127um separation, compatible with commercial V-grooves). In this work, we present the experimental characterization of the chip: transmission performance, polarization issues and single mode spectral range. The targeted single mode spectral range must cover 550-800nm. Different optical powers for laser writing are used to finely tune the ideal single-mode behavior of the waveguides, ranging from 220 to 270mW. A straight waveguide was used as a reference, imprinted close to the first interferometric channel. Using different lasers (635nm, 780nm and 980nm) as well as wideband sources, we have been able to characterize the spectral transmission, the polarization behavior (TE/TM) and the interferometric contrast. The chip was inserted in the FIRST/SUBARU optical bench simulator at LESIA, in order to inject the 5 inputs simultaneously and scan the fringes using 4 independent MEMS, inducing a relative OPD modulation. Preliminary results show very good transmission for such a complex chip: all input channels are above 45% at 635nm (comparing the injected single mode with the sum of the 4 corresponding outputs), with two inputs reaching 80%. A huge advantage of this technology is to avoid the crosstalk due to in-plane waveguide crossings, and we show that no crosstalk is indeed observed. Both polarizations are transmitted, without noticeable birefringence. However, perfect vertical alignment of the outputs is difficult to obtain, and must be optimized prior to any connectorization to fiber bundles.

Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Laser written 3D 3T spectro-interferometer: study and optimisation of the laser-written nano-antenna

Myriam Bonduelle, Guillermo Martin, Irene Heras Perez, Alain Morand, Ciro d'Amico, Razvan Stoian, Guodong Zhang, Guanghua Cheng

Proceedings Volume 11446, 114462T (2020) https://doi.org/10.1117/12.2562179

KEYWORDS: Infrared spectroscopy, Integrated optics, Infrared radiation, Spectroscopy, Waveguides, Infrared detectors, Beam splitters, Fabrication, Mirrors, Dielectrics

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Proceedings Article | 26 July 2016 Paper

Recent results on photonic devices made by laser writing: 3D 3T near IR waveguides, mid-IR spectrometers and electro-optic beam combiners

G. Martin, J. Vázquez de Aldana, A. Rodenas, C. d'Amico, R. Stoian

Proceedings Volume 9907, 990739 (2016) https://doi.org/10.1117/12.2233198

KEYWORDS: Waveguides, Electro optics, Mid-IR, Spectrometers, Integrated optics, Channel waveguides, Interferometry, Lithium niobate, Polarization, Mirrors

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