Patents by Inventor Han Cheol Ryu
Han Cheol Ryu 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: 9618823Abstract: Disclosed herein is a photomixer and method of manufacturing the photomixer which can fundamentally solve the existing restrictive factors of a PCA and a photomixer which are core parts of a conventional broadband terahertz spectroscopy system. The presented photomixer includes an active layer formed on a top surface of a substrate, the active layer being formed on an area on which light is incident, and a thermal conductive layer formed on the top surface of the substrate, the thermal conductive layer being formed on an area other than the area on which light is incident. The active layer is formed to have a mesa cross section, and the thermal conductive layer is regrown on an area other than the area on which light is incident using an MOCVD method, and has a flattened surface.Type: GrantFiled: September 17, 2013Date of Patent: April 11, 2017Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Kyung-Hyun Park, Nam-Je Kim, Hyun-Sung Ko, Dong-Hun Lee, Sang-Pil Han, Han-Cheol Ryu, Jeong-Woo Park, Ki-Won Moon, Dae-Yong Kim
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Patent number: 9553678Abstract: Disclosed herein is an interconnection apparatus and method using terahertz waves. The interconnection apparatus using terahertz waves according to the present invention includes a first terahertz wave generation unit for generating a first transmission terahertz wave, a center frequency of which is a first center frequency, using photomixing. A second terahertz wave generation unit generates a second transmission terahertz wave, a center frequency of which is a second center frequency different from the first center frequency. A first terahertz wave detection unit detects a first reception terahertz wave corresponding to the first transmission terahertz wave. A second terahertz wave detection unit detects a second reception terahertz wave corresponding to the second transmission terahertz wave.Type: GrantFiled: May 31, 2013Date of Patent: January 24, 2017Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Kyung-Hyun Park, Han-Cheol Ryu, Jeong-Woo Park, Sang-Pil Han, Nam-Je Kim
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Patent number: 9410851Abstract: The inventive concept relates to a beating signal monitoring module and a terahertz wave generation device and an optical signal monitoring device that including the beating signal monitoring module. The beating signal monitoring module includes a nonlinear unit generating an optical signal including a FWM light in response to a beating signal generated from a first light and a second light; a filter unit separating the FWM light from the optical signal and outputting the separated FWM light; and a monitoring unit monitoring the beating signal using the separated FWM light. The beating signal monitoring module and a terahertz wave generation device and an optical signal monitoring device that including the beating signal monitoring module can effectively monitor a beating signal being generated by two lasers using a Four Wave Mixing signal.Type: GrantFiled: September 10, 2013Date of Patent: August 9, 2016Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Namje Kim, Sang-Pil Han, Kyung Hyun Park, Han-Cheol Ryu, Hyunsung Ko, Jeong Woo Park
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Patent number: 9228826Abstract: A contactless thickness measuring apparatus is provided which includes an terahertz transmitter configured to receive the first optical path signal from the coupler and to generate a terahertz continuous wave using the first optical signal and an applied bias; an optical delay line configured to delay the second optical path signal output from the coupler; and an terahertz receiver configured to receive the terahertz continuous wave penetrating a sample and to detect an optical current using the terahertz continuous wave and the second optical path signal delayed. A thickness of the sample is a value corresponding to the optical current which phase value becomes a constant regardless of a plurality of measurement frequencies.Type: GrantFiled: March 13, 2013Date of Patent: January 5, 2016Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Han-Cheol Ryu, Namje Kim, Sang-Pil Han, Kyung Hyun Park, Hyunsung Ko, Jeong Woo Park
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Publication number: 20150277208Abstract: Disclosed herein is a photomixer and method of manufacturing the photomixer which can fundamentally solve the existing restrictive factors of a PCA and a photomixer which are core parts of a conventional broadband terahertz spectroscopy system. The presented photomixer includes an active layer formed on a top surface of a substrate, the active layer being formed on an area on which light is incident, and a thermal conductive layer formed on the top surface of the substrate, the thermal conductive layer being formed on an area other than the area on which light is incident. The active layer is formed to have a mesa cross section, and the thermal conductive layer is regrown on an area other than the area on which light is incident using an MOCVD method, and has a flattened surface.Type: ApplicationFiled: September 17, 2013Publication date: October 1, 2015Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Kyung-Hyun Park, Nam-Je Kim, Hyun-Sung Ko, Dong-Hun Lee, Sang-Pil Han, Han-Cheol Ryu, Jeong-Woo Park, Ki-Won Moon, Dae-Yong Kim
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Patent number: 9136421Abstract: Provided is a broadband photomixer technology that is a core to generate continuous frequency variable and pulsed terahertz waves. It is possible to enhance light absorptance by applying the transmittance characteristic of a 2D light crystal structure and it is possible to increase the generation efficiency of terahertz waves accordingly. Moreover, it is possible to implement a wide area array type terahertz photomixer by applying an interdigit structure and spatially properly arranging a light crystal structure having various cycles. Accordingly, it is possible to solve difficulty in thermal characteristic and light alignment by mitigating the high light density of a light absorption unit and low photoelectric conversion efficiency is drastically improved. In addition, the radiation pattern of terahertz waves may be electrically controlled through the present invention.Type: GrantFiled: January 14, 2014Date of Patent: September 15, 2015Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Kiwon Moon, Han-Cheol Ryu, Sang-Pil Han, Kyung Hyun Park
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Patent number: 9130082Abstract: Provided is a terahertz wave generating/detecting apparatus and a method for manufacturing the same. The terahertz wave generating/detecting apparatus includes; a substrate having an active region and a transmitting region; a lower metal layer extending in a first direction on the active region and the transmitting region of the substrate; a graphene layer disposed on the lower metal layer on the active region; and upper metal layers extending in the first direction on the graphene layer of the active region and the substrate in the transmission region, wherein a terahertz wave is generated or amplified by a surface plasmon polariton that is induced on a boundary surface between the graphene layer and the lower metal layer by beated laser light applied to the graphene layer and the metal layer.Type: GrantFiled: October 25, 2013Date of Patent: September 8, 2015Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Kyung Hyun Park, Sang-Pil Han, Jeong Woo Park, Han-Cheol Ryu, Kiwon Moon, Namje Kim, Hyunsung Ko
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Patent number: 9035251Abstract: A terahertz wave generating module includes a bidirectional light source which provides a first dual-mode beam in a first direction and a second dual-mode beam in a second direction; a forward lens unit which focuses the first dual-mode beam; a photomixer unit which converts the first dual-mode beam focused by the forward lens unit into a terahertz wave; a backward lens unit which focuses the second dual-mode beam; and a light output unit which uses the second dual-mode beam focused by the backward lens unit as a light signal, wherein the bidirectional light source, the forward lens unit, the photomixer unit, the backward lens unit, and the light output unit are integrated in a housing.Type: GrantFiled: October 8, 2013Date of Patent: May 19, 2015Assignee: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Sang-Pil Han, Kyung Hyun Park, Namje Kim, Han-Cheol Ryu, Jeong Woo Park, Hyunsung Ko, Kiwon Moon
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Patent number: 8957441Abstract: The exemplary embodiments of the present invention include forming a photoconductor thin film on a front surface of a substrate; forming a photoconductor thin film pattern by patterning the photoconductor thin film; and forming a metal electrode on the photoconductor thin film pattern.Type: GrantFiled: November 8, 2011Date of Patent: February 17, 2015Assignee: Intellectual Discovery Co., Ltd.Inventors: Dong Suk Jun, Kwang-Yong Kang, Sungil Kim, Mun Cheol Paek, Han-Cheol Ryu, Min Hwan Kwak, Seung Beom Kang
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Publication number: 20140197425Abstract: Provided is a broadband photomixer technology that is a core to generate continuous frequency variable and pulsed terahertz waves. It is possible to enhance light absorptance by applying the transmittance characteristic of a 2D light crystal structure and it is possible to increase the generation efficiency of terahertz waves accordingly. Moreover, it is possible to implement a wide area array type terahertz photomixer by applying an interdigit structure and spatially properly arranging a light crystal structure having various cycles. Accordingly, it is possible to solve difficulty in thermal characteristic and light alignment by mitigating the high light density of a light absorption unit and low photoelectric conversion efficiency is drastically improved. In addition, the radiation pattern of terahertz waves may be electrically controlled through the present invention.Type: ApplicationFiled: January 14, 2014Publication date: July 17, 2014Applicant: Electronics and Telecommunications Research InstituteInventors: Kiwon MOON, Han-Cheol RYU, Sang-Pil HAN, Kyung Hyun PARK
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Patent number: 8772725Abstract: An optical device may include first and second lasers generating first and second laser beams; and a photo detector detecting the first and second laser beams. The optical detector comprises a substrate, a first impurity layer on the substrate, an absorption layer on the first impurity layer and a second impurity layer on the absorption layer. The absorption layer generates a terahertz by a beating of the first and second laser beams and has a thickness of less than 0.2 ?m.Type: GrantFiled: March 15, 2013Date of Patent: July 8, 2014Assignee: Electronics and Telecommunications Research InstituteInventors: Jeong Woo Park, Kyung Hyun Park, Han-Cheol Ryu, Dong-Hun Lee, Sang-Pil Han, Hyunsung Ko, Namje Kim
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Publication number: 20140183441Abstract: Provided is a terahertz wave generating/detecting apparatus and a method for manufacturing the same. The terahertz wave generating/detecting apparatus includes; a substrate having an active region and a transmitting region; a lower metal layer extending in a first direction on the active region and the transmitting region of the substrate; a graphene layer disposed on the lower metal layer on the active region; and upper metal layers extending in the first direction on the graphene layer of the active region and the substrate in the transmission region, wherein a terahertz wave is generated or amplified by a surface plasmon polariton that is induced on a boundary surface between the graphene layer and the lower metal layer by beated laser light applied to the graphene layer and the metal layer.Type: ApplicationFiled: October 25, 2013Publication date: July 3, 2014Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Kyung Hyun PARK, Sang-Pil HAN, Jeong Woo PARK, Han-Cheol RYU, Kiwon MOON, Namje KIM, Hyunsung KO
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Publication number: 20140175306Abstract: The inventive concept relates to a beating signal monitoring module and a terahertz wave generation device and an optical signal monitoring device that including the beating signal monitoring module. The beating signal monitoring module includes a nonlinear unit generating an optical signal including a FWM light in response to a beating signal generated from a first light and a second light; a filter unit separating the FWM light from the optical signal and outputting the separated FWM light; and a monitoring unit monitoring the beating signal using the separated FWM light. The beating signal monitoring module and a terahertz wave generation device and an optical signal monitoring device that including the beating signal monitoring module can effectively monitor a beating signal being generated by two lasers using a Four Wave Mixing signal.Type: ApplicationFiled: September 10, 2013Publication date: June 26, 2014Applicant: Electronics and Telecommunications Research InstituteInventors: Namje KIM, Sang-Pil HAN, Kyung Hyun PARK, Han-Cheol RYU, Hyunsung KO, Jeong Woo PARK
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Publication number: 20140166881Abstract: A terahertz wave generating module includes a bidirectional light source which provides a first dual-mode beam in a first direction and a second dual-mode beam in a second direction; a forward lens unit which focuses the first dual-mode beam; a photomixer unit which converts the first dual-mode beam focused by the forward lens unit into a terahertz wave; a backward lens unit which focuses the second dual-mode beam; and a light output unit which uses the second dual-mode beam focused by the backward lens unit as a light signal, wherein the bidirectional light source, the forward lens unit, the photomixer unit, the backward lens unit, and the light output unit are integrated in a housing.Type: ApplicationFiled: October 8, 2013Publication date: June 19, 2014Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Sang-Pil HAN, Kyung Hyun PARK, Namje KIM, Han-Cheol RYU, Jeong Woo PARK, Hyunsung KO, Kiwon MOON
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Patent number: 8610094Abstract: Disclosed is a terahertz wave generator which includes a first light source outputting a first light having a first frequency; a second light source outputting a second light having a second frequency different from the first frequency; a second harmonic generation unit performing second harmonic conversion on the first and second lights to generate a third light and a fourth light; and a photomixer converting a mixing light of the third and fourth lights into a terahertz wave alternating signal and outputting a terahertz wave.Type: GrantFiled: September 13, 2012Date of Patent: December 17, 2013Assignee: Electronics and Telecommunications Research InstituteInventors: Namje Kim, Kyung Hyun Park, Sang-Pil Han, Hyunsung Ko, Jeong Woo Park, Han-Cheol Ryu
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Publication number: 20130320215Abstract: Disclosed herein is an interconnection apparatus and method using terahertz waves. The interconnection apparatus using terahertz waves according to the present invention includes a first terahertz wave generation unit for generating a first transmission terahertz wave, a center frequency of which is a first center frequency, using photomixing. A second terahertz wave generation unit generates a second transmission terahertz wave, a center frequency of which is a second center frequency different from the first center frequency. A first terahertz wave detection unit detects a first reception terahertz wave corresponding to the first transmission terahertz wave. A second terahertz wave detection unit detects a second reception terahertz wave corresponding to the second transmission terahertz wave.Type: ApplicationFiled: May 31, 2013Publication date: December 5, 2013Inventors: Kyung-Hyun PARK, Han-Cheol RYU, Jeong-Woo PARK, Sang-Pil HAN, Nam-Je KIM
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Publication number: 20130161541Abstract: Disclosed is a terahertz wave generator which includes a first light source outputting a first light having a first frequency; a second light source outputting a second light having a second frequency different from the first frequency; a second harmonic generation unit performing second harmonic conversion on the first and second lights to generate a third light and a fourth light; and a photomixer converting a mixing light of the third and fourth lights into a terahertz wave alternating signal and outputting a terahertz wave.Type: ApplicationFiled: September 13, 2012Publication date: June 27, 2013Applicant: Electronics and Telecommunications Research InstitueInventors: Namje KIM, Kyung Hyun Park, Sang-Pil Han, Hyunsung Ko, Jeong Woo Park, Han-Cheol Ryu
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Publication number: 20120166144Abstract: A device characteristics measurement method using an all-optoelectronic terahertz photomixing system includes: calculating power of an antenna of a transmitter by adding a matching condition between output impedance of the photomixer and input impedance of the antenna of the transmitter to power of the photomixer of the transmitter; calculating power of an antenna of a receiver based on the power of the antenna of the transmitter; and outputting the power of the antenna of the transmitter and the power of the antenna of the receiver so as to analyze device characteristics of the photomixer and the antenna of the transmitter.Type: ApplicationFiled: October 21, 2011Publication date: June 28, 2012Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Han-Cheol Ryu, Min Hwan Kwak, Seung beom Kang, Sungil Kim, Dong Suk Jun, Mun Cheol Paek, Kwang Yong Kang
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Publication number: 20120112230Abstract: The exemplary embodiments of the present invention include forming a photoconductor thin film on a front surface of a substrate; forming a photoconductor thin film pattern by patterning the photoconductor thin film; and forming a metal electrode on the photoconductor thin film pattern.Type: ApplicationFiled: November 8, 2011Publication date: May 10, 2012Applicant: Electronics and Telecommunications Research InstituteInventors: Dong Suk JUN, Kwang-Yong KANG, Sungil KIM, Mun Cheol PAEK, Han-Cheol RYU, Min Hwan KWAK, Seung beom KANG
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Publication number: 20100134372Abstract: Provided is a folded dipole antenna including a meander line formed on a photoconductive substrate, characterized by an input impedance of several k?, which is much higher than that of a conventional dipole antenna, due to optimization of a horizontal length, a line interval, a width, and a line number of the meander line. Accordingly, use of the folded dipole antenna greatly improves an impedance matching characteristic between the antenna and a photomixer having an output impedance of 10 k? or more, and accordingly an output of a THz continuous wave.Type: ApplicationFiled: July 7, 2009Publication date: June 3, 2010Applicant: ELECTRONICS AND TELECOMMUNICATIONS RESEARCH INSTITUTEInventors: Han Cheol Ryu, Kwang Yong Kang, Min Hwan Kwak, Sung Il Kim