Patents by Inventor Ivan Celanovic
Ivan Celanovic 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: 10073191Abstract: A filter to transmit incident radiation at a predetermined incidence angle includes a plurality of photonic crystal structures disposed substantially along a surface normal direction of the filter. The photonic crystal structure includes a multilayer cell that comprises a first layer having a first dielectric permittivity, and a second layer having a second dielectric permittivity different from the first dielectric permittivity. The first layer and the second layer define a Brewster angle substantially equal to the predetermined incidence angle based on the first dielectric permittivity and the second permittivity. Each photonic crystal structure in the plurality of photonic crystal structures defines a respective bandgap, and the respective bandgaps of the plurality of photonic crystal structures, taken together, cover a continuous spectral region of about 50 nm to about 100 mm.Type: GrantFiled: February 24, 2015Date of Patent: September 11, 2018Assignee: Massachusetts Institute of TechnologyInventors: Yichen Shen, Dexin Ye, Ivan Celanovic, Steven G. Johnson, John D. Joannopoulos, Marin Soljacic
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Publication number: 20180159460Abstract: An apparatus for generating electricity via thermophotovoltaic (TPV) energy conversion includes a metallic combustor to convert fuel into heat. The apparatus also includes a metallic photonic crystal to emit electromagnetic radiation within a predetermined wavelength band in response to receiving the heat from the combustor. A brazing layer is disposed between the combustor and the photonic crystal to couple the combustor with the photonic crystal. The apparatus also includes a photovoltaic cell, in electromagnetic communication with the photonic crystal, to convert the electromagnetic radiation emitted by the photonic crystal into electricity.Type: ApplicationFiled: December 6, 2017Publication date: June 7, 2018Inventors: Walker Chan, Ivan Celanovic, John D. Joannopoulos, Marin Soljacic, Veronika Stelmakh
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Patent number: 9929690Abstract: A solar thermal photovoltaic device, and method of forming same, includes a solar absorber and a spectrally selective emitter formed on either side of a thermally conductive substrate. The solar absorber is configured to absorb incident solar radiation. The solar absorber and the spectrally selective emitter are configured with an optimized emitter-to-absorber area ratio. The solar thermal photovoltaic device also includes a photovoltaic cell in thermal communication with the spectrally selective emitter. The spectrally selective emitter is configured to permit high emittance for energies above a bandgap of the photovoltaic cell and configured to permit low emittance for energies below the bandgap.Type: GrantFiled: October 31, 2014Date of Patent: March 27, 2018Assignee: Massachusetts Institute of TechnologyInventors: Andrej Lenert, David Bierman, Walker Chan, Ivan Celanovic, Marin Soljacic, Evelyn N. Wang, Young Suk Nam, Kenneth McEnaney, Daniel Kraemer, Gang Chen
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Publication number: 20160252652Abstract: A filter to transmit incident radiation at a predetermined incidence angle includes a plurality of photonic crystal structures disposed substantially along a surface normal direction of the filter. The photonic crystal structure includes a multilayer cell that comprises a first layer having a first dielectric permittivity, and a second layer having a second dielectric permittivity different from the first dielectric permittivity. The first layer and the second layer define a Brewster angle substantially equal to the predetermined incidence angle based on the first dielectric permittivity and the second permittivity. Each photonic crystal structure in the plurality of photonic crystal structures defines a respective bandgap, and the respective bandgaps of the plurality of photonic crystal structures, taken together, cover a continuous spectral region of about 50 nm to about 100 mm.Type: ApplicationFiled: February 24, 2015Publication date: September 1, 2016Applicant: MASSACHUSETTS INSTITUTE OF TECHNOLOGYInventors: Yichen Shen, Dexin Ye, Ivan Celanovic, Steven G. Johnson, John D. Joannopoulos, Marin Soljacic
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Publication number: 20160164451Abstract: A solar thermal photovoltaic device, and method of forming same, includes a solar absorber and a spectrally selective emitter formed on either side of a thermally conductive substrate. The solar absorber is configured to absorb incident solar radiation. The solar absorber and the spectrally selective emitter are configured with an optimized emitter-to-absorber area ratio. The solar thermal photovoltaic device also includes a photovoltaic cell in thermal communication with the spectrally selective emitter. The spectrally selective emitter is configured to permit high emittance for energies above a bandgap of the photovoltaic cell and configured to permit low emittance for energies below the bandgap.Type: ApplicationFiled: October 31, 2014Publication date: June 9, 2016Inventors: Andrej Lenert, David Bierman, Walker Chan, Ivan Celanovic, Marin Soljacic, Evelyn N. Wang, Young Suk Nam, Kenneth McEnaney, Daniel Kraemer, Gang Chen
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Patent number: 9116537Abstract: Inventive systems and methods for the generation of energy using thermophotovoltaic cells are described. Also described are systems and methods for selectively emitting electromagnetic radiation from an emitter for use in thermophotovoltaic energy generation systems. In at least some of the inventive energy generation systems and methods, a voltage applied to the thermophotovoltaic cell (e.g., to enhance the power produced by the cell) can be adjusted to enhance system performance. Certain embodiments of the systems and methods described herein can be used to generate energy relatively efficiently.Type: GrantFiled: May 20, 2011Date of Patent: August 25, 2015Assignee: Massachusetts Institute of TechnologyInventors: Ivan Celanovic, Walker Chan, Peter Bermel, Adrian Y. X. Yeng, Christopher Marton, Michael Ghebrebrhan, Mohammad Araghchini, Klavs F. Jensen, Marin Soljacic, John D. Joannopoulos, Steven G. Johnson, Robert Pilawa-Podgurski, Peter Fisher
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Patent number: 9057830Abstract: The present invention provides systems, articles, and methods for discriminating electromagnetic radiation based upon the angle of incidence of the electromagnetic radiation. In some cases, the materials and systems described herein can be capable of inhibiting reflection of electromagnetic radiation (e.g., the materials and systems can be capable of transmitting and/or absorbing electromagnetic radiation) within a given range of angles of incidence at a first incident surface, while substantially reflecting electromagnetic radiation outside the range of angles of incidence at a second incident surface (which can be the same as or different from the first incident surface). A photonic material comprising a plurality of periodically occurring separate domains can be used, in some cases, to selectively transmit and/or selectively absorb one portion of incoming electromagnetic radiation while reflecting another portion of incoming electromagnetic radiation, based upon the angle of incidence.Type: GrantFiled: July 19, 2011Date of Patent: June 16, 2015Assignee: Massachusetts Institute of TechnologyInventors: Rafif E. Hamam, Peter Bermel, Ivan Celanovic, Marin Soljacic, Adrian Y. X. Yeng, Michael Ghebrebrhan, John D. Joannopoulos
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Patent number: 8823250Abstract: Incandescent lighting structure. The structure includes a thermal emitter that can, but does not have to, include a first photonic crystal on its surface to tailor thermal emission coupled to, in a high-view-factor geometry, a second photonic filter selected to reflect infrared radiation back to the emitter while passing visible light. This structure is highly efficient as compared to standard incandescent light bulbs.Type: GrantFiled: January 2, 2013Date of Patent: September 2, 2014Assignee: Massachusetts Institute of TechnologyInventors: Peter Bermel, Ognjen Ilic, Walker R. Chan, Ahmet Musabeyoglu, Aviv Ruben Cukierman, Michael Robert Harradon, Ivan Celanovic, Marin Soljacic
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Publication number: 20140042890Abstract: Incandescent lighting structure. The structure includes a thermal emitter that can, but does not have to, include a first photonic crystal on its surface to tailor thermal emission coupled to, in a high-view-factor geometry, a second photonic filter selected to reflect infrared radiation back to the emitter while passing visible light. This structure is highly efficient as compared to standard incandescent light bulbs.Type: ApplicationFiled: January 2, 2013Publication date: February 13, 2014Applicant: Massachusetts Institute of TechnologyInventors: Peter Bermel, Ognjen llic, Walker R. Chan, Ahmet Musabeyoglu, Aviv Ruben Cukieman, Michael Robert Harradon, Ivan Celanovic, Marin Soijacic
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Publication number: 20120037217Abstract: The present invention provides systems, articles, and methods for discriminating electromagnetic radiation based upon the angle of incidence of the electromagnetic radiation. In some cases, the materials and systems described herein can be capable of inhibiting reflection of electromagnetic radiation (e.g., the materials and systems can be capable of transmitting and/or absorbing electromagnetic radiation) within a given range of angles of incidence at a first incident surface, while substantially reflecting electromagnetic radiation outside the range of angles of incidence at a second incident surface (which can be the same as or different from the first incident surface). A photonic material comprising a plurality of periodically occurring separate domains can be used, in some cases, to selectively transmit and/or selectively absorb one portion of incoming electromagnetic radiation while reflecting another portion of incoming electromagnetic radiation, based upon the angle of incidence.Type: ApplicationFiled: July 19, 2011Publication date: February 16, 2012Applicant: Massachusetts Institute of TechnologyInventors: Rafif E. Hamam, Peter Bermel, Ivan Celanovic, Marin Soljacic, Adrian Y.X. Yeng, Michael Ghebrebrhan, John D. Joannopoulos
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Publication number: 20110284059Abstract: Inventive systems and methods for the generation of energy using thermophotovoltaic cells are described. Also described are systems and methods for selectively emitting electromagnetic radiation from an emitter for use in thermophotovoltaic energy generation systems. In at least some of the inventive energy generation systems and methods, a voltage applied to the thermophotovoltaic cell (e.g., to enhance the power produced by the cell) can be adjusted to enhance system performance. Certain embodiments of the systems and methods described herein can be used to generate energy relatively efficiently.Type: ApplicationFiled: May 20, 2011Publication date: November 24, 2011Applicant: Massachusetts Institute of TechnologyInventors: Ivan Celanovic, Walker Chan, Peter Bermel, Adrian Y.X. Yeng, Christopher Marton, Michael Ghebrebrhan, Mohammad Araghchini, Klavs F. Jensen, Marin Soljacic, John D. Joannopoulos, Steven G. Johnson, Robert Pilawa-Podgurski, Peter Fisher
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Patent number: 7482610Abstract: A thermal emitter device includes a cavity structure that comprises an active medium for allowing thermal emissions to occur. A photonic crystal structure is positioned on one side of the cavity structure. The photonic crystal structure comprises alternating layers of high index and low index materials and acts as a first mirror for the cavity structure. A highly reflective mirror structure is positioned on another side of the cavity structure and acting as both the high-temperature source of radiation and a second mirror for the cavity structure.Type: GrantFiled: January 13, 2006Date of Patent: January 27, 2009Assignee: Massachusetts Institute of TechnologyInventors: Ivan Celanovic, John G. Kassakian, David J. Perrault
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Patent number: 7251402Abstract: Light transmission is maximized through the pass band of a photonic bandgap (PBG) crystal (having alternating high- and low-index material) while preserving high reflection for stop band. An anti-reflective coating (ARC) is used to coat the PBG crystal wherein the ARC material has a refractive index of n=(nairĂ—nhigh index material)1/2 and thickness around ?c/8 where ?c is center wavelength.Type: GrantFiled: August 23, 2005Date of Patent: July 31, 2007Assignee: Massachusetts Institute of TechnologyInventors: Shoji Akiyama, Ivan Celanovic, Natalija Z. Jovanovic, Francis O'Sullivan, Kazumi Wada
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Publication number: 20070053651Abstract: Light transmission is maximized through the pass band of a photonic bandgap (PBG) crystal (having alternating high- and low-index material) while preserving high reflection for stop band. An anti-reflective coating (ARC) is used to coat the PBG crystal wherein the ARC material has a refractive index of n=(nairĂ—nhigh index material)1/2 and thickness around ?c/8 where ?c is center wavelength.Type: ApplicationFiled: August 23, 2005Publication date: March 8, 2007Inventors: Shoji Akiyama, Ivan Celanovic, Natalija Jovanovic, Francis O'Sullivan, Kazumi Wada
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Publication number: 20060186357Abstract: A thermal emitter device includes a cavity structure that comprises an active medium for allowing thermal emissions to occur. A photonic crystal structure is positioned on one side of the cavity structure. The photonic crystal structure comprises alternating layers of high index and low index materials and acts as a first mirror for the cavity structure. A highly reflective mirror structure is positioned on another side of the cavity structure and acting as both the high-temperature source of radiation and a second mirror for the cavity structure.Type: ApplicationFiled: January 13, 2006Publication date: August 24, 2006Inventors: Ivan Celanovic, John Kassakian, David Perrault
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Patent number: RE47157Abstract: The present invention provides systems, articles, and methods for discriminating electromagnetic radiation based upon the angle of incidence of the electromagnetic radiation. In some cases, the materials and systems described herein can be capable of inhibiting reflection of electromagnetic radiation (e.g., the materials and systems can be capable of transmitting and/or absorbing electromagnetic radiation) within a given range of angles of incidence at a first incident surface, while substantially reflecting electromagnetic radiation outside the range of angles of incidence at a second incident surface (which can be the same as or different from the first incident surface). A photonic material comprising a plurality of periodically occurring separate domains can be used, in some cases, to selectively transmit and/or selectively absorb one portion of incoming electromagnetic radiation while reflecting another portion of incoming electromagnetic radiation, based upon the angle of incidence.Type: GrantFiled: June 12, 2017Date of Patent: December 11, 2018Assignee: Massachusetts Institute of TechnologyInventors: Rafif E. Hamam, Peter Bermel, Ivan Celanovic, Marin Soljacic, Adrian Y. X. Yeng, Michael Ghebrebrhan, John D. Joannopoulos