Dr. Harry-Dean Kenchington Goldsmith Profile

Dr. Harry-Dean Kenchington Goldsmith

Postdoctoral Fellow at Astrophotonics Australia

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Publications (16)

Proceedings Article | 13 September 2024 Presentation + Paper

Spectral interferometric wavefront sensing: a solution for petalometry at Subaru/SCExAO

V. Deo, S. Vievard, M. Lallement, M. Lucas, E. Huby, K. Ahn, O. Guyon, J. Lozi, H.-D. Kenchington Goldsmith, S. Lacour, G. Martin, B. Norris, G. Perrin, G. Singh, P. Tuthill

Proceedings Volume 13097, 130972G (2024) https://doi.org/10.1117/12.3019419

KEYWORDS: Adaptive optics, Wavefronts, Wavefront sensors, Interferometry, Telescopes, Photons, Point spread functions, Sensors, Design, Calibration

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Proceedings Article | 28 August 2024 Poster + Paper

A new photonic integrated circuit for the FIRST instrument: towards high throughput with a compact photonic chip

Harry-Dean Kenchington Goldsmith, Elsa Huby, Manon Lallement, Kévin Barjot, Sebastien Vievard, Vincent Deo, Olivier Guyon, Guillermo Martin, Sylvestre Lacour

Proceedings Volume 13095, 130951Z (2024) https://doi.org/10.1117/12.3018270

KEYWORDS: Waveguides, Photonic integrated circuits, Fabrication, Design, Telescopes, Scattered light, Polarization, Directional couplers

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A photonic integrated circuit (PIC) is a lightweight, compact alternative to bulk optics. The Fibered Imager foR a Single Telescope (FIRST) instrument, is a spectro-interferometer performing pupil remapping and designed to operate in the 600 to 800nm visible wavelength range. It is installed on the Subaru Coronagraphic Extreme Adaptive Optics (SCExAO) instrument’s platform at the Subaru telescope. In the integrated optical version of FIRST (FIRST PIC), the interferometric combination of the beams occurs by the pairwise combination of five sub-apertures to achieve 20 baselines. This paper introduces a PIC design with novel components for splitting and pairwise coupling the light for FIRST PIC, fabricated and packaged by LioniX International. A high index difference between the waveguide fundamental mode and cladding material was selected to allow compact circuits with prospects of increasing the number of combined sub-apertures with designs of much greater complexity. The high confinement waveguides were simulated to produce approximately 50% injection loss, a tapering system in both height and width to a low confinement waveguide at the PIC interface ameliorated the loss. The optimised throughput prediction is estimated at 80%. Standard couplers and splitters are expected to have high losses due to fabrication tolerances, and due to the high confinement, standard couplers’ performance is highly dependent on the wavelength. Presented here are novel component designs to replace them. Tapered directional couplers, which maintain an acceptable coupling ratio over the entire bandwidth, and tri-couplers, with higher throughput than conventional splitters but high intolerance to fabrication issues, were designed and fabricated for this purpose. The designs and individual experimental verification will be discussed, focusing on polarization and wavelength response. The full combination of components was used to create a five sub-aperture combiner for FIRST. Cross-talk between crossed waveguides was measured independently for the two polarisations. The cross-coupling over the full bandwidth was measured as low as 2% in one polarization, without active subtraction for scattered light to confirm the light in the ports was guided from the cross-coupling, and as low as 8% in the other. Additional work, and potential refinement of the photonic chip components, are required to differentiate the scattered light from the cross-talk to ensure it is reduced in both polarisations.

Proceedings Article | 28 August 2024 Presentation

Status of FIRST spectro-interferometer on SCExAO: sensitivity study and characterization of 5-telescopes visible photonics integrated circuits

Manon Lallement, Elsa Huby, Sylvestre Lacour, Sebastien Vievard, Guillermo Martin, Harry-Dean Kenchington Goldsmith, Kévin Barjot, Olivier Guyon, Julien Lozi, Vincent Deo, Kyohoon Ahn, Miles Lucas, Cécil Pham, Cédric Cassagnettes, Daniel Rouan, Vincent Lapeyrere, Guy Perrin, Nick Cvetojevic, Frantz Martinache, Franck Marchis, Takayuki Kotani, Gaspard Duchene

Proceedings Volume 13095, 1309508 (2024) https://doi.org/10.1117/12.3018406

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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 | 19 July 2024 Presentation

Spectroscopy below the diffraction limit with FIRST at the Subaru Telescope

Elsa Huby, Sébastien Vievard, Gaspard Duchene, Olivier Guyon, Sylvestre Lacour, Guy Perrin, Kevin Barjot, Vincent Deo, Nemanja Jovanovic, Harry-Dean Kenchington Goldsmith, Takayuki Kotani, Manon Lallement, Vincent Lapeyrere, Julien Lozi, Franck Marchis, Guillermo Martin, Daniel Rouan

Proceedings Volume 13096, 130960O (2024) https://doi.org/10.1117/12.3019806

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Proceedings Article | 18 July 2024 Presentation + Paper

Visible photonic lantern integration, characterization, and on-sky testing on Subaru/SCExAO

S. Vievard, M. Lallement, S. Leon-Saval, O. Guyon, N. Jovanovic, E. Huby, S. Lacour, J. Lozi, V. Deo, K. Ahn, M. Lucas, T. Currie, S. Sallum, M. Fitzgerald, C. Betters, B. Norris, R. Amezcua-Correa, S. Yerolatsitis, J. Lin, Y. Kim, P. Gatkine, T. Kotani, M. Tamura, G. Martin, H. Kenchington Goldsmith, G. Perrin

Proceedings Volume 13096, 130960P (2024) https://doi.org/10.1117/12.3018031

KEYWORDS: Single mode fibers, Telescopes, Visible radiation, Spectroscopes, Spectrographs, Calibration, Equipment, Spatial resolution, Imaging spectroscopy, Adaptive optics

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Proceedings Article | 5 October 2023 Presentation + Paper

Photonic spectro-interferometry with SCExAO/FIRST at the Subaru Telescope: towards Hα imaging of protoplanets

S. Vievard, M. Lallement, E. Huby, S. Lacour, O. Guyon, N. Jovanovic, S. Leon-Saval, J. Lozi, V. Deo, K. Ahn, N. Cvetojevic, K. Barjot, G. Martin, H. D. Kenchington-Goldsmith, G. Duchêne, T. Kotani, F. Marchis, D. Rouan, M. Fitzgerald, S. Sallum, B. Norris, C. Betters, P. Gatkine, J. Lin, Y. J. Kim, C. Pham, C. Cassagnettes, A. Billat, M. Tamura, G. Perrin

Proceedings Volume 12680, 126800H (2023) https://doi.org/10.1117/12.2676319

KEYWORDS: Telescopes, Single mode fibers, Optical path differences, Spectrographs, Photonic integrated circuits, Polarization, Microelectromechanical systems, Calibration, Visible radiation

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Proceedings Article | 26 August 2022 Poster + Paper

Design of the VLTI/Hi-5 light injection system

G. Garreau, A. Bigioli, G. Raskin, J.-P. Berger, C. Dandumont, H.-D. Kenchington Goldsmith, S. Gross, M. Ireland, L. Labadie, R. Laugier, J. Loicq, S. Madden, G. Martin, A. Mazzoli, J. Morren, H. Shao, K. Yan, D. Defrère

Proceedings Volume 12183, 1218320 (2022) https://doi.org/10.1117/12.2629180

KEYWORDS: Mirrors, Zemax, Wavefronts, Tolerancing, Photonics, Nulling interferometry, Error analysis, Telescopes, Optical design

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Proceedings Article | 26 August 2022 Presentation + Paper

L-band nulling interferometry at the VLTI with Asgard/Hi-5: status and plans

Denis Defrère, Azzurra Bigioli, Colin Dandumont, Germain Garreau, Romain Laugier, Marc-Antoine Martinod, Olivier Absil, Jean-Philippe Berger, Emilie Bouzerand, Benjamin Courtney-Barrer, Alexandre Emsenhuber, Steve Ertel, Jonathan Gagne, Adrian Glauser, Simon Gross, Michael Ireland, Harry-Dean Kenchington, Jacques Kluska, Stefan Kraus, Lucas Labadie, Viktor Laborde, Alain Léger, Jarron Leisenring, Jérôme Loicq, Guillermo Martin, Johan Morren, Alexis Matter, Alexandra Mazzoli, Kwinten Missiaen, Salman Muhammad, Marc Ollivier, Gert Raskin, Hélène Rousseau, Ahmed Sanny, Simon Verlinden, Bart Vandenbussche, Julien Woillez

Proceedings Volume 12183, 121830H (2022) https://doi.org/10.1117/12.2627953

KEYWORDS: Stars, Planets, Exoplanets, Nulling interferometry, L band, Telescopes, Interferometers, Astronomy, Spectral resolution, Interferometry

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Proceedings Article | 26 August 2022 Poster + Paper

Technical requirements and optical design of the Hi-5 spectrometer

C. Dandumont, A. Mazzoli, V. Laborde, R. Laugier, A. Bigioli, G. Garreau, S. Gross, M. Ireland, H.-D. Kenchington Goldsmith, L. Labadie, M.-A. Martinod, G. Raskin, A. Sanny, J. Loicq, D. Defrère

Proceedings Volume 12183, 121831Y (2022) https://doi.org/10.1117/12.2627939

KEYWORDS: Spectroscopy, Polarization, Spectral resolution, Optical design, Diffraction, Sensors, Diffraction gratings, Point spread functions, Germanium, Telescopes

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Proceedings Article | 13 December 2020 Poster + Presentation + Paper

Active phase change for a kernel nulling interferometer

Harry-Dean Kenchington Goldsmith, Michael Ireland, Frantz Martinache, Nick Cvetojevic, Stephen Madden

Proceedings Volume 11446, 114462V (2020) https://doi.org/10.1117/12.2562894

KEYWORDS: Waveguides, Nulling interferometry, Exoplanets, Chalcogenides, Stars, Phase interferometry, Brain-machine interfaces, Imaging systems, Interferometers, Lead

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Proceedings Article | 3 January 2020 Paper

A photonic solution to exoplanet direct imaging via nulling interferometry

Harry-Dean Kenchington Goldsmith, Michael Ireland, Steve Madden

Proceedings Volume 11203, 112030T (2020) https://doi.org/10.1117/12.2540454

KEYWORDS: Exoplanets, Stars, Nulling interferometry, Interferometers, Telescopes, Imaging systems, Coronagraphy, Interferometry, Chalcogenides

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Proceedings Article | 30 December 2019 Paper

Parametric design study of monolayer graphene based TeO2 waveguide saturable absorber

Yile Zhong, Dige Wang, Harry-Dean Kenchington Goldsmith, Steve Madden

Proceedings Volume 11200, 1120036 (2019) https://doi.org/10.1117/12.2540684

KEYWORDS: Graphene, Waveguides, Absorption, Mode locking, Planar waveguides

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Proceedings Article | 30 December 2019 Paper

Fabrication tolerant planar directional couplers

C. K. Lai, Y. L. Zhong, T. Han, W. Y. Chong, D. Y. Choi, H. D. K. Goldsmith, P. Ma, H. Ahmad, S. Madden

Proceedings Volume 11200, 1120033 (2019) https://doi.org/10.1117/12.2540497

KEYWORDS: Waveguides, Directional couplers, Tolerancing, Physics, Wavelength division multiplexing, Lithography, Mach-Zehnder interferometers, Photonics, Electro optics, System on a chip

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Proceedings Article | 9 July 2018 Presentation + Paper

Photonic mid-infrared nulling for exoplanet detection on a planar chalcogenide platform

Harry-Dean Kenchington Goldsmith, Michael Ireland, Pan Ma, Barry Luther-Davies, Rongping Wang, Barnaby Norris, Peter Tuthill, Stephen Madden

Proceedings Volume 10701, 107011E (2018) https://doi.org/10.1117/12.2311904

KEYWORDS: Waveguides, Stars, Exoplanets, Glasses, Light scattering, Cladding, Refractive index, Germanium, Absorption, Astronomy, Nulling interferometry

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Proceedings Article | 4 August 2016 Paper

Chalcogenide glass planar MIR couplers for future chip based Bracewell interferometers

H.-D. Kenchington Goldsmith, N. Cvetojevic, M. Ireland, P. Ma, P. Tuthill, B. Eggleton, J. Lawrence, S. Debbarma, B. Luther-Davies, S. Madden

Proceedings Volume 9907, 990730 (2016) https://doi.org/10.1117/12.2232199

KEYWORDS: Photonics, Chalcogenide glass, Exoplanets, Interferometers, Interferometry, Astronomy, Exoplanets, Stars, Waveguides, Brain-machine interfaces, Space telescopes

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Showing 5 of 16 publications

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