Patents by Inventor Julien Lumeau

Julien Lumeau has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20220146710
    Abstract: A method for manufacturing an optical metasurface is configured to operate in a given working spectral band. The method comprises: obtaining a 2D array of patterns, each comprising one or more nanostructures forming dielectric elements that are resonant in said working spectral band, said nanostructures being formed in at least one photosensitive dielectric medium; exposing said 2D array to a writing electromagnetic wave having at least one wavelength in said photosensitivity spectral band, said writing wave having a spatial energy distribution in a plane of the 2D array that is a function of an intended phase profile, so that each pattern of the 2D array produces on an incident electromagnetic wave having a wavelength in the working spectral band, a phase variation corresponding to a refractive index variation experienced by said pattern during said exposure.
    Type: Application
    Filed: February 14, 2020
    Publication date: May 12, 2022
    Applicants: Université D'Aix-Marseille, Centre National de la Recherche Scientifique, Ecole Centrale de Marseille, Multiwave Innovation
    Inventors: Elena Mikheeva, Redha Abdeddaim, Stefan Enoch, Julien Lumeau, Ivan Voznyuk, Tryfon Antonakakis
  • Publication number: 20220009269
    Abstract: The present invention particularly relates to a method for physical vacuum deposition of a coating (R) comprising at least one material (M) on at least a portion of a front face (10) of a support (1), said at least one material (M) originating from an evaporation source or an atomisation source (2), wherein:—use is made of a support (1), at least a portion of the front face (10) of which is smooth, that is to say, does not have any roughness and/or reliefs and/or recesses;—said vacuum deposition is carried out while varying the thickness distribution of the material (M) on said front face (10), that is, while progressively varying the thickness deposited, from a central region (11) in the direction of at least one lateral region (12) contiguous to the central region (11), without modifying the position of the evaporation source or atomisation source (2) of the material particles (M).
    Type: Application
    Filed: November 28, 2019
    Publication date: January 13, 2022
    Applicants: OBERTHUR FIDUCIAIRE SAS, Centre National de la Recherche Scientifique (CNRS), ECOLE CENTRALE DE MARSEILLE, Universite D'Aix Marseille
    Inventors: Julien Lumeau, Fabien Lemarchand, Antonin Moreau, Thomas Begou, Julien Gillot, Xavier Borde
  • Patent number: 9696476
    Abstract: Complex spectral and angular diffractive optical elements in photosensitive materials based on Moiré pattern are proposed and demonstrated. The process is based on the recording of multiple volume Bragg gratings with controlled difference of the periods in the same volume of photosensitive material. Filters with ultra-narrow bandpass in the range of a few picometers to a few tens of picometers or apodized diffractive optical elements across large aperture are demonstrated. Several methods to fabricating such Moiré Bragg gratings are proposed. Experimental demonstration of a Moiré ultra-narrowband diffractive optical element in PTR glass is performed.
    Type: Grant
    Filed: May 14, 2010
    Date of Patent: July 4, 2017
    Assignees: Optigrate Corporation, University of Central Florida Research Foundation, Inc.
    Inventors: Leonid B. Glebov, Julien Lumeau, Sergiy Mokhov, Vadim Smirnov, Boris Zeldovich
  • Patent number: 8724207
    Abstract: Recent invention of longitudinally chirped volume Bragg gratings has dramatically changed a design of high power femtosecond lasers. Replacing of bulky pairs of conventional surface gratings with compact and robust chirped volume Bragg gratings for stretching and compression of laser pulses in chirped-pulse-amplification systems enabled decrease of size and weight of those systems by several times. The methods and devices enable substantial increase of stretching time and compression to shorter pulses, enhancement of stretched and compressed beams quality by stationary or dynamic shaping of gratings, and shaping of laser pulses in both temporal and spectral domains.
    Type: Grant
    Filed: January 13, 2011
    Date of Patent: May 13, 2014
    Assignees: University of Central Florida Research Foundation, Inc., Optigrate Corporation
    Inventors: Oleksiy Andrusyak, Almantas Galvanauskas, Leonid B. Glebov, Larissa Glebova, Julien Lumeau, Sergiy Mokhov, Eugeniu Rotari, Vadim I. Smirnov, Boris Ya Zeldovich
  • Patent number: 8399155
    Abstract: Apparatus, methods and systems for production of high efficiency refractive and diffractive elements by providing a photo-sensitizer free multicomponent glass, exposing the multi component glass to pulsed laser radiation to produce refractive indexed modulation, and heating the exposed multicomponent silicate glass to produce the high efficiency refractive and diffractive elements. The pulsed laser radiation is infrared femtosecond pulses to ultraviolet nanosecond pulses which provide ionization of glass matrix. The multicomponent glass is a photosensitive glass with high transparency in ultraviolet spectral region, e.g. silicate glass which includes silver, fluorine and bromine and does not contain photosensitizers such as cerium and antimony, PTR glass, cerium free PTR glass and cerium+antimony free PTR glass.
    Type: Grant
    Filed: May 3, 2007
    Date of Patent: March 19, 2013
    Assignee: University of Central Florida Research Foundation, Inc.
    Inventors: Leo A. Siiman, Julien Lumeau, Larissa Glebova, Vadim I. Smirnov, Leonid B. Glebov