Patents by Inventor Steven Brem
Steven Brem 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).
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Patent number: 11898958Abstract: A spot on a layer of a 2D semiconductor material deposited on a substrate is irradiated so as to generate excitons, so that photons are emitted from the layer. The photoluminescence spectrum is recorded for different values of the charge carrier concentration in the layer. The modulation of the charge carrier concentration may be realized by modulating the output power of the light source used to irradiate the sample. The relation is recorded between the ratio of the photoluminescence intensity of a first peak in the spectrum related to radiative recombination from indirect bandgaps to the intensity of a second peak in the spectrum related to radiative recombination from direct bandgaps, and the carrier concentration. This relation is fitted to a model of the ratio that takes into account multiple recombination mechanisms, radiative and non-radiative. From this process, the trap density within the bandgap is derived.Type: GrantFiled: May 18, 2021Date of Patent: February 13, 2024Assignees: IMEC VZW, Katholieke UniversitietInventors: Alessandra Leonhardt, Cesar Javier Lockhart De La Rosa, Stefan De Gendt, Cedric Huyghebaert, Steven Brems, Thomas Nuytten
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Publication number: 20210356399Abstract: A spot on a layer of a 2D semiconductor material deposited on a substrate is irradiated so as to generate excitons, so that photons are emitted from the layer. The photoluminescence spectrum is recorded for different values of the charge carrier concentration in the layer. The modulation of the charge carrier concentration may be realized by modulating the output power of the light source used to irradiate the sample. The relation is recorded between the ratio of the photoluminescence intensity of a first peak in the spectrum related to radiative recombination from indirect bandgaps to the intensity of a second peak in the spectrum related to radiative recombination from direct bandgaps, and the carrier concentration. This relation is fitted to a model of the ratio that takes into account multiple recombination mechanisms, radiative and non-radiative. From this process, the trap density within the bandgap is derived.Type: ApplicationFiled: May 18, 2021Publication date: November 18, 2021Inventors: Alessandra Leonhardt, Cesar Javier Lockhart De La Rosa, Stefan De Gendt, Cedric Huyghebaert, Steven Brems, Thomas Nuytten
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Patent number: 10481233Abstract: Edema invariant tractography methods are provided. The methods include acquiring data using a multishell, high angular resolution diffusion imaging sequence; (ii) modeling the data using a multi-compartment model; and (iii) reconstructing the fibers through a probabilistic tracking algorithm using a fiber orientation distribution which has streamlines fitted to the output of said probabilistic tracking algorithm.Type: GrantFiled: September 8, 2015Date of Patent: November 19, 2019Assignee: The Trustees of the University of PennsylvaniaInventors: Ragini Verma, Luke Macyszyn, Emmanuel Caruyer, Jeremy Lecoeur, Mark Elliot, Steven Brem
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Patent number: 10369775Abstract: The disclosed technology generally relates to preparing two-dimensional material layers, and more particularly to releasing a graphene layer from a template substrate. According to an aspect, a method of releasing a graphene layer includes providing a template substrate on which the graphene layer is provided, the method comprising: subjecting the graphene layer and the template substrate to a water treatment by soaking the graphene layer and the template substrate in water such that water is intercalated between the template substrate and the graphene layer; and subjecting the graphene layer and the template substrate to a delamination process, thereby releasing the graphene layer from the template substrate.Type: GrantFiled: December 8, 2017Date of Patent: August 6, 2019Assignees: IMEC vzw, Katholieke Universiteit LeuvenInventors: Steven Brems, Cedric Huyghebaert, Ken Verguts, Stefan De Gendt
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Publication number: 20180162115Abstract: The disclosed technology generally relates to preparing two-dimensional material layers, and more particularly to releasing a graphene layer from a template substrate. According to an aspect, a method of releasing a graphene layer includes providing a template substrate on which the graphene layer is provided, the method comprising: subjecting the graphene layer and the template substrate to a water treatment by soaking the graphene layer and the template substrate in water such that water is intercalated between the template substrate and the graphene layer; and subjecting the graphene layer and the template substrate to a delamination process, thereby releasing the graphene layer from the template substrate.Type: ApplicationFiled: December 8, 2017Publication date: June 14, 2018Inventors: Steven Brems, Cedric Huyghebaert, Ken Verguts, Stefan De Gendt
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Publication number: 20170285124Abstract: Edema invariant tractography methods are provided. The methods include acquiring data using a multishell, high angular resolution diffusion imaging sequence; (ii) modeling the data using a multi-compartment model; and (iii) reconstructing the fibers through a probabilistic tracking algorithm using a fiber orientation distribution which has streamlines fitted to the output of said probabilistic tracking algorithm.Type: ApplicationFiled: September 8, 2015Publication date: October 5, 2017Inventors: Ragini Verma, Luke Macyszyn, Emmanuel Caruyer, Jeremy Lecoeur, Mark Elliot, Steven Brem
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Patent number: 9673373Abstract: This present application relates to a system for delivering megasonic energy to a liquid, involving one or more megasonic transducers, each transducer having a single operating frequency within an ultrasound bandwidth and comprising two or more groups of piezoelectric elements arranged in one or more rows, and a megasonic generator means for driving the one or more transducers at frequencies within the bandwidth, the generator means being adapted for changing the voltage applied to each group of piezoelectric elements so as to achieve substantially the same maximum acoustic pressure for each group of piezoelectric elements. The generator means and transducers being constructed and arranged so as to produce ultrasound within the liquid. Such a system may be part of an apparatus for cleaning a surface of an article such as a semiconductor wafer or a medical implant.Type: GrantFiled: August 15, 2013Date of Patent: June 6, 2017Assignee: IMECInventors: Steven Brems, Paul Mertens
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Publication number: 20170076936Abstract: Disclosed are systems and methods for cleaning semiconductor substrates, wherein a nucleation structure having nucleation sites is mounted facing a surface of the substrate to be cleaned. The substrate and structure are brought into contact with a cleaning liquid, which is subsequently subjected to acoustic waves of a given frequency. The nucleation template features easier nucleation formation than the surface that needs to be cleaned by, for example, causing the template to have a higher contact angle when in contact with the liquid than the substrate surface to be clean. Therefore, bubbles nucleate on the structure and not on the surface to be cleaned.Type: ApplicationFiled: November 22, 2016Publication date: March 16, 2017Inventors: Paul Mertens, Steven Brems
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Patent number: 9378989Abstract: The present invention is related to a method and apparatus for cleaning a substrate, in particular a semiconductor substrate such as a silicon wafer. The substrate is placed in a tank containing a cleaning liquid, at an angle with respect to acoustic waves produced in said liquid. The angle corresponds to the angle of transmission, i.e. the angle at which waves are not reflected off the substrate surface. A damping material is provided in the tank, arranged to absorb substantially all waves thus transmitted through the substrate. A significant improvement in terms of cleaning efficiency is obtained by the method of the invention.Type: GrantFiled: April 23, 2012Date of Patent: June 28, 2016Assignees: IMEC, Katholieke Universiteit Leuven, KU LEUVEN R&DInventors: Paul Mertens, Steven Brems, Elisabeth Camerotto, Marc Hauptmann
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Patent number: 8788015Abstract: A method of optimizing pre-operative procedures in the field of neurosurgery. The method facilitates the identification of essential fiber tract pathways that must be avoided when planning and performing an operation, thereby increasing surgical safety and avoiding complications. The method includes the combined use of four variables in Diffusion Tensor Imaging (DTI)-Fiber Tracking (FT) of projection fibers in the brain. These variables include Jain-Bremâ„¢ fractional anisotropy constant for tractography (JB-FACT), Jain-Bremâ„¢ fiber length (JB-FL), subcentimeter size placement of regions of interest (ROI), and the placement of ROIs to cover the anatomical pathway of projection fibers. JB-FACT and JB-FL provide rapid, reproducible tracking for projection fibers in the brain.Type: GrantFiled: February 6, 2012Date of Patent: July 22, 2014Assignee: University of South FloridaInventors: Surbhi Jain, Steven Brem
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Patent number: 8741575Abstract: The present invention relates to biomarkers for neoplasias such as high grade gliomas. The inventors have discovered that the overexpression of senescence associated genes (SAG) is associated with a poor prognosis in subjects with high grade gliomas. The present invention provides SAG biomarkers for predicting response to therapy for subjects having high grade glioma based on dividing the samples into high and low risk groups; diagnosing high grade glioma; monitoring progression of high grade glioma from one biological state to another; and determining efficacy of treatment for high grade gliomas.Type: GrantFiled: August 29, 2012Date of Patent: June 3, 2014Assignee: H. Lee Moffitt Cancer Center and Research Institute, Inc.Inventors: Domenico Coppola, Dung-Tsa Chen, Steven Brem
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Publication number: 20140053864Abstract: This present application relates to a system for delivering megasonic energy to a liquid, involving one or more megasonic transducers, each transducer having a single operating frequency within an ultrasound bandwidth and comprising two or more groups of piezoelectric elements arranged in one or more rows, and a megasonic generator means for driving the one or more transducers at frequencies within the bandwidth, the generator means being adapted for changing the voltage applied to each group of piezoelectric elements so as to achieve substantially the same maximum acoustic pressure for each group of piezoelectric elements. The generator means and transducers being constructed and arranged so as to produce ultrasound within the liquid. Such a system may be part of an apparatus for cleaning a surface of an article such as a semiconductor wafer or a medical implant.Type: ApplicationFiled: August 15, 2013Publication date: February 27, 2014Applicant: IMECInventors: Steven Brems, Paul Mertens
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Publication number: 20120322687Abstract: The present invention relates to biomarkers for neoplasias such as high grade gliomas. The inventors have discovered that the overexpression of senescence associated genes (SAG) is associated with a poor prognosis in subjects with high grade gliomas. The present invention provides SAG biomarkers for predicting response to therapy for subjects having high grade glioma based on dividing the samples into high and low risk groups; diagnosing high grade glioma; monitoring progression of high grade glioma from one biological state to another; and determining efficacy of treatment for high grade gliomas.Type: ApplicationFiled: August 29, 2012Publication date: December 20, 2012Applicant: H. Lee Moffitt Cancer Center and Research Institute, Inc.Inventors: Domenico Coppola, Dung-Tsa Chen, Steven Brem
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Publication number: 20120266912Abstract: The present invention is related to a method and apparatus for cleaning a substrate, in particular a semiconductor substrate such as a silicon wafer. The substrate is placed in a tank containing a cleaning liquid, at an angle with respect to acoustic waves produced in said liquid. The angle corresponds to the angle of transmission, i.e. the angle at which waves are not reflected off the substrate surface. A damping material is provided in the tank, arranged to absorb substantially all waves thus transmitted through the substrate. A significant improvement in terms of cleaning efficiency is obtained by the method of the invention.Type: ApplicationFiled: April 23, 2012Publication date: October 25, 2012Applicants: Katholieke Universiteit Leuven, K.U. Leuven R&D, IMECInventors: Paul Mertens, Steven Brems, Elisabeth Camerotto, Marc Hauptmann
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Publication number: 20120227775Abstract: Methods and apparatuses for cleaning a surface of a substrate are presented. The method comprises positioning a substrate at a controllable distance from a piezoelectric transducer, supplying a cleaning liquid between the substrate and the transducer, applying an oscillating acoustic force to the cleaning liquid by actuating the transducer, and moving the transducer relative to the substrate. The method further comprises, while moving the transducer relative to the substrate, measuring a value that indicates a distance between a surface of the substrate and the transducer, comparing the measured value to a desired value, and adjusting the distance between the surface and the transducer so that the measured value is maintained substantially equal to the desired value. The measured value may be the distance between the surface of the substrate and the transducer or a phase shift between an alternating current and voltage applied to the transducer.Type: ApplicationFiled: May 25, 2012Publication date: September 13, 2012Applicant: IMECInventors: Steven Brems, Paul Mertens
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Publication number: 20120172705Abstract: A method of optimizing pre-operative procedures in the field of neurosurgery. The method facilitates the identification of essential fiber tract pathways that must be avoided when planning and performing an operation, thereby increasing surgical safety and avoiding complications. The method includes the combined use of four variables in Diffusion Tensor Imaging (DTI)-Fiber Tracking (FT) of projection fibers in the brain. These variables include Jain-BremTM fractional anisotropy constant for tractography (JB-FACT), Jain-BremTM fiber length (JB-FL), subcentimeter size placement of regions of interest (ROI), and the placement of ROIs to cover the anatomical pathway of projection fibers. JB-FACT and JB-FL provide rapid, reproducible tracking for projection fibers in the brain.Type: ApplicationFiled: February 6, 2012Publication date: July 5, 2012Applicants: H. LEE MOFFITT CANCER CENTER AND RESEARCH INSTITUTE, INC., UNIVERSITY OF SOUTH FLORIDAInventors: Surbhi Jain, Steven Brem
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Patent number: 8197604Abstract: Methods and apparatuses for cleaning a surface of a substrate are presented. The method comprises positioning a substrate at a controllable distance from a piezoelectric transducer, supplying a cleaning liquid between the substrate and the transducer, applying an oscillating acoustic force to the cleaning liquid by actuating the transducer, and moving the transducer relative to the substrate. The method further comprises, while moving the transducer relative to the substrate, measuring a value that indicates a distance between a surface of the substrate and the transducer, comparing the measured value to a desired value, and adjusting the distance between the surface and the transducer so that the measured value is maintained substantially equal to the desired value. The measured value may be the distance between the surface of the substrate and the transducer or a phase shift between an alternating current and voltage applied to the transducer.Type: GrantFiled: June 30, 2010Date of Patent: June 12, 2012Assignee: IMECInventors: Steven Brems, Paul Mertens
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Publication number: 20110088719Abstract: Disclosed are systems and methods for cleaning semiconductor substrates, wherein a nucleation structure having nucleation sites is mounted facing a surface of the substrate to be cleaned. The substrate and structure are brought into contact with a cleaning liquid, which is subsequently subjected to acoustic waves of a given frequency. The nucleation template features easier nucleation formation than the surface that needs to be cleaned by, for example, causing the template to have a higher contact angle when in contact with the liquid than the substrate surface to be clean. Therefore, bubbles nucleate on the structure and not on the surface to be cleaned.Type: ApplicationFiled: October 20, 2010Publication date: April 21, 2011Applicant: IMECInventors: Paul Mertens, Steven Brems
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Publication number: 20110000504Abstract: Methods and apparatuses for cleaning a surface of a substrate are presented. The method comprises positioning a substrate at a controllable distance from a piezoelectric transducer, supplying a cleaning liquid between the substrate and the transducer, applying an oscillating acoustic force to the cleaning liquid by actuating the transducer, and moving the transducer relative to the substrate. The method further comprises, while moving the transducer relative to the substrate, measuring a value that indicates a distance between a surface of the substrate and the transducer, comparing the measured value to a desired value, and adjusting the distance between the surface and the transducer so that the measured value is maintained substantially equal to the desired value. The measured value may be the distance between the surface of the substrate and the transducer or a phase shift between an alternating current and voltage applied to the transducer.Type: ApplicationFiled: June 30, 2010Publication date: January 6, 2011Applicant: IMECInventors: Steven Brems, Paul Mertens