Patents by Inventor Byoung-Seung Ham
Byoung-Seung Ham 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: 10750948Abstract: The present invention provides a method which can significantly increase the signal-to-noise ratio of an ultrasound-modulated optical signal by overcoming the shallow depth problem of in vivo optical imaging in existing optical imaging by use of a quantum optical phenomenon based on ultraslow light and nondegenerate phase conjugation and which can be applied directly not only to medical optical imaging, but also to medical photodynamic therapy, through slow light amplification of phase conjugate waves.Type: GrantFiled: August 26, 2016Date of Patent: August 25, 2020Assignee: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGYInventor: Byoung Seung Ham
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Publication number: 20170055838Abstract: The present invention provides a method which can significantly increase the signal-to-noise ratio of an ultrasound-modulated optical signal by overcoming the shallow depth problem of in vivo optical imaging in existing optical imaging by use of a quantum optical phenomenon based on ultraslow light and nondegenerate phase conjugation and which can be applied directly not only to medical optical imaging, but also to medical photodynamic therapy, through slow light amplification of phase conjugate waves.Type: ApplicationFiled: August 26, 2016Publication date: March 2, 2017Inventor: Byoung Seung HAM
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Patent number: 9500933Abstract: A system, method, and apparatus for delayed optical logic gates based on slow light and enhanced nondegenerate four-wave mixing processes, where a single or multiple delayed optical routers are utilized for dark resonance interactions in which two-color lasers interact with a three-level nonlinear optical medium comprised of two ground states and one excited state through the nondegenerate four-wave mixing processes. The delayed optical logic mechanism is based on combination of single or multiple dark resonance-induced two-photon coherence conversion via slow light phenomenon. The two-photon coherence induced on the ground states is optically detected via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to dark resonance or electromagnetically induced transparency. The delayed optical logic gates have potential to keep up ultra-high-bandwidth optical information processing using relatively slow electronic processing devices.Type: GrantFiled: June 3, 2015Date of Patent: November 22, 2016Assignees: GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGY, INHA INDUSTRY PARTNERSHIP INSTITUTEInventor: Byoung Seung Ham
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Publication number: 20150346581Abstract: A system, method, and apparatus for delayed optical logic gates based on slow light and enhanced nondegenerate four-wave mixing processes, where a single or multiple delayed optical routers are utilized for dark resonance interactions in which two-color lasers interact with a three-level nonlinear optical medium comprised of two ground states and one excited state through the nondegenerate four-wave mixing processes. The delayed optical logic mechanism is based on combination of single or multiple dark resonance-induced two-photon coherence conversion via slow light phenomenon. The two-photon coherence induced on the ground states is optically detected via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to dark resonance or electromagnetically induced transparency. The delayed optical logic gates have potential to keep up ultra-high-bandwidth optical information processing using relatively slow electronic processing devices.Type: ApplicationFiled: June 3, 2015Publication date: December 3, 2015Inventor: Byoung Seung HAM
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Patent number: 9075250Abstract: A system, method, and apparatus for delayed optical logic gates based on slow light and enhanced nondegenerate four-wave mixing processes, where a single or multiple delayed optical routers are utilized for dark resonance interactions in which two-color lasers interact with a three-level nonlinear optical medium comprised of two ground states and one excited state through the nondegenerate four-wave mixing processes. The delayed optical logic mechanism is based on combination of single or multiple dark resonance-induced two-photon coherence conversion via slow light phenomenon. The two-photon coherence induced on the ground states is optically detected via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to dark resonance or electromagnetically induced transparency. The delayed optical logic gates have potential to keep up ultra-high-bandwidth optical information processing using relatively slow electronic processing devices.Type: GrantFiled: July 27, 2012Date of Patent: July 7, 2015Assignees: INHA INDUSTRY PARTNERSHIP INSTITUTE, GWANGJU INSTITUTE OF SCIENCE AND TECHNOLOGYInventor: Byoung-Seung Ham
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Patent number: 8797621Abstract: Disclosed herein are atom phase-controlled double rephasing-based quantum memory and a double-rephased photon echo method therefor. The atom phase-controlled double rephasing-based quantum memory includes an optical medium and an optical pulse generation unit. The optical medium has three energy levels (|1>, |2> and |3>), receives one or more optical pulses from an optical pulse generation unit, and generates output light that satisfies phase matching conditions. The optical pulse generation unit generates at least five optical pulses that resonate among the energy levels of the optical medium.Type: GrantFiled: May 8, 2012Date of Patent: August 5, 2014Assignees: INHA Industry Partnership Institute, Gwangju Institute of Science and TechnologyInventor: Byoung Seung Ham
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Publication number: 20130182303Abstract: Disclosed herein are atom phase-controlled double rephasing-based quantum memory and a double-rephased photon echo method therefor. The atom phase-controlled double rephasing-based quantum memory includes an optical medium and an optical pulse generation unit. The optical medium has three energy levels (|1>, |2> and |3>), receives one or more optical pulses from an optical pulse generation unit, and generates output light that satisfies phase matching conditions. The optical pulse generation unit generates at least five optical pulses that resonate among the energy levels of the optical medium.Type: ApplicationFiled: May 8, 2012Publication date: July 18, 2013Applicant: INHA-INDUSTRY PARTNERSHIP INSTITUTEInventor: Byoung Seung HAM
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Patent number: 8446658Abstract: An optical switch combining a Pockels cell and a metamaterial, wherein polarization of an incident light is controlled by a voltage on the Pockels cell to block or pass the incident light. The optical switch has advantages of small size, fast switching, simple structure, and high stability. A plasmonic-EIT kind of optical switch is based on plasmonic hybridization and a plasmonic interaction is controlled by altering a polarization state of the incident light. Therefore, the incident light can be selectively allowed to pass through or blocked according to the polarization thereof.Type: GrantFiled: February 9, 2011Date of Patent: May 21, 2013Assignee: Inha-Industry Partnership InstituteInventors: Byoung Seung Ham, Hua Xu
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Publication number: 20120307327Abstract: A system, method, and apparatus for delayed optical logic gates based on slow light and enhanced nondegenerate four-wave mixing processes, where a single or multiple delayed optical routers are utilized for dark resonance interactions in which two-color lasers interact with a three-level nonlinear optical medium comprised of two ground states and one excited state through the nondegenerate four-wave mixing processes. The delayed optical logic mechanism is based on combination of single or multiple dark resonance-induced two-photon coherence conversion via slow light phenomenon. The two-photon coherence induced on the ground states is optically detected via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to dark resonance or electromagnetically induced transparency. The delayed optical logic gates have potential to keep up ultra-high-bandwidth optical information processing using relatively slow electronic processing devices.Type: ApplicationFiled: July 27, 2012Publication date: December 6, 2012Inventor: Byoung-Seung Ham
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Patent number: 8259376Abstract: A system, method, and apparatus for delayed optical logic gates based on slow light and enhanced nondegenerate four-wave mixing processes, where a single or multiple delayed optical routers are utilized for dark resonance interactions in which two-color lasers interact with a three-level nonlinear optical medium comprised of two ground states and one excited state through the nondegenerate four-wave mixing processes. The delayed optical logic mechanism is based on combination of single or multiple dark resonance-induced two-photon coherence conversion via slow light phenomenon. The two-photon coherence induced on the ground states is optically detected via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to dark resonance or electromagnetically induced transparency.Type: GrantFiled: December 26, 2007Date of Patent: September 4, 2012Assignee: Inha-Industry Partnership InstituteInventor: Byoung-Seung Ham
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Patent number: 8259377Abstract: A system, method, and apparatus for delayed optical logic gates based on slow light and enhanced nondegenerate four-wave mixing processes, where a single or multiple delayed optical routers are utilized for dark resonance interactions in which two-color lasers interact with a three-level nonlinear optical medium comprised of two ground states and one excited state through the nondegenerate four-wave mixing processes. The delayed optical logic mechanism is based on combination of single or multiple dark resonance-induced two-photon coherence conversion via slow light phenomenon. The two-photon coherence induced on the ground states is optically detected via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to dark resonance or electromagnetically induced transparency. The delayed optical logic gates have potential to keep up ultra-high-bandwidth optical information processing using relatively slow electronic processing devices.Type: GrantFiled: January 26, 2011Date of Patent: September 4, 2012Assignee: Inha-Industry Partnership InstituteInventor: Byoung-Seung Ham
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Publication number: 20120120474Abstract: An optical switch combining a Pockels cell and a metamaterial, wherein polarization of an incident light is controlled by a voltage on the Pockels cell to block or pass the incident light. The optical switch has advantages of small size, fast switching, simple structure, and high stability. A plasmonic-EIT kind of optical switch is based on plasmonic hybridization and a plasmonic interaction is controlled by altering a polarization state of the incident light. Therefore, the incident light can be selectively allowed to pass through or blocked according to the polarization thereof.Type: ApplicationFiled: February 9, 2011Publication date: May 17, 2012Inventors: Byoung Seung Ham, Hua Xu
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Patent number: 8135277Abstract: A system, method, and apparatus for delayed optical router based on slow light and nondegenerate four-wave mixing processes are presented, in which three laser pulses interact with a three-level nonlinear optical medium composing two closely spaced ground states and an excited state. The delayed optical routing mechanism is based on a slow light phenomenon, in which a group velocity of an incoming input signal pulse is slowed down due to quantum coherence induced refractive index change. The two-photon coherence induced on the ground states via electromagnetically induced transparency is optically recovered via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to absorption cancellation. In this case, the individual pulse switching/routing time is limited by the coherence decay time that is much faster than population decay time, where the population decay-time is a limiting factor of conventional switching devices.Type: GrantFiled: December 26, 2007Date of Patent: March 13, 2012Assignee: INHA-Industry Partnership InstituteInventor: Byoung-Seung Ham
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Patent number: 8094367Abstract: Disclosed herein is an optically locked photon echo apparatus and method, which can solve the problem of limited echo efficiency and can overcome constraints on the conventional storage time being limited to the spin dephasing time. The optically locked photon echo apparatus of the present invention includes a nonlinear optical medium and an optical pulse generation unit. The nonlinear optical medium is provided with three energy levels |1>, |2>, and |3>, and is configured to receive optical pulses from an optical pulse generation unit and generate output light (E) which satisfies a phase matching condition. The optical pulse generation unit is configured to generate five or more optical pulses which resonate between the energy levels of the optical medium.Type: GrantFiled: August 16, 2010Date of Patent: January 10, 2012Assignee: INHA-Industry Partnership InstituteInventor: Byoung Seung Ham
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Publication number: 20110222387Abstract: Disclosed herein is an optically locked photon echo apparatus and method, which can solve the problem of limited echo efficiency and can overcome constraints on the conventional storage time being limited to the spin dephasing time. The optically locked photon echo apparatus of the present invention includes a nonlinear optical medium and an optical pulse generation unit. The nonlinear optical medium is provided with three energy levels |1>, |2>, and |3>, and is configured to receive optical pulses from an optical pulse generation unit and generate output light (E) which satisfies a phase matching condition. The optical pulse generation unit is configured to generate five or more optical pulses which resonate between the energy levels of the optical medium.Type: ApplicationFiled: August 16, 2010Publication date: September 15, 2011Inventor: Byoung Seung HAM
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Patent number: 7952796Abstract: The present invention provides a quantum optical data storage protocol, whose storage time is lengthened by spin population decay time from several minutes to several hours.Type: GrantFiled: November 20, 2008Date of Patent: May 31, 2011Assignee: Inha-Industry Partnership InstituteInventor: Byoung-Seung Ham
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Publication number: 20110116144Abstract: A system, method, and apparatus for delayed optical logic gates based on slow light and enhanced nondegenerate four-wave mixing processes, where a single or multiple delayed optical routers are utilized for dark resonance interactions in which two-color lasers interact with a three-level nonlinear optical medium comprised of two ground states and one excited state through the nondegenerate four-wave mixing processes. The delayed optical logic mechanism is based on combination of single or multiple dark resonance-induced two-photon coherence conversion via slow light phenomenon. The two-photon coherence induced on the ground states is optically detected via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to dark resonance or electromagnetically induced transparency.Type: ApplicationFiled: January 26, 2011Publication date: May 19, 2011Inventor: Byoung-Seung Ham
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Publication number: 20100232792Abstract: A system, method, and apparatus for delayed optical router based on slow light and nondegenerate four-wave mixing processes are presented, in which three laser pulses interact with a three-level nonlinear optical medium composing two closely spaced ground states and an excited state. The delayed optical routing mechanism is based on a slow light phenomenon, in which a group velocity of an incoming input signal pulse is slowed down due to quantum coherence induced refractive index change. The two-photon coherence induced on the ground states via electromagnetically induced transparency is optically recovered via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to absorption cancellation. In this case, the individual pulse switching/routing time is limited by the coherence decay time that is much faster than population decay time, where the population decay-time is a limiting factor of conventional switching devices.Type: ApplicationFiled: December 26, 2007Publication date: September 16, 2010Applicant: INHA-INDUSTRY PARTNERSHIP INSTITUTEInventor: Byoung-Seung Ham
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Publication number: 20100232001Abstract: A system, method, and apparatus for delayed optical logic gates based on slow light and enhanced nondegenerate four-wave mixing processes, where a single or multiple delayed optical routers are utilized for dark resonance interactions in which two-color lasers interact with a three-level nonlinear optical medium comprised of two ground states and one excited state through the nondegenerate four-wave mixing processes. The delayed optical logic mechanism is based on combination of single or multiple dark resonance-induced two-photon coherence conversion via slow light phenomenon. The two-photon coherence induced on the ground states is optically detected via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to dark resonance or electromagnetically induced transparency.Type: ApplicationFiled: December 26, 2007Publication date: September 16, 2010Applicant: INHA-INDUSTRY PARTNERSHIP INSTITUTEInventor: Byoung-Seung Ham
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Patent number: 7755821Abstract: A system, method, and apparatus for photon logic gates based on quantum switch, where a single or multiple quantum switches are utilized for dark resonance interactions in which three-color lasers interact with a four-level or five-level nonlinear optical medium composed of three ground states and one or two excited states through nondegenerate four-wave mixing processes. The photon logic mechanism is based on combination of single or multiple dark resonance-induced two-photon coherence swapping among the three closely spaced ground states through optical transitions via a common excited state. The two-photon coherence induced on the ground states is optically detected via nondegenerate four-wave mixing processes. The nondegenerate four-wave mixing generation is enhanced owing to dark resonance or electromagnetically induced transparency.Type: GrantFiled: March 7, 2007Date of Patent: July 13, 2010Assignee: INHA-Industry Partnership InstituteInventor: Byoung Seung Ham