Patents by Inventor Hiroaki Misawa
Hiroaki Misawa 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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Publication number: 20090091762Abstract: In a metallic structure including a metallic nano-chain with plasmon resonance absorption, a metallic nanoparticle forming the metallic nano-chain is formed in a circular, triangle, or rhomboid shape. The wavelength selectivity can be increased also by forming a closed region by mutually linking all of metallic nanoparticles that are mutually linked with bottlenecks. In a photodetector, a photodetection unit including a current detection probe, a nano-chain unit, and a current detection probe is arranged on a substrate. The nano-chain unit is a metallic structure with plasmon resonance absorption, where metallic nanoparticles are mutually linked with bottlenecks. Each current detection probe has a corner whose tip is formed with a predetermined angle, and this corner is arranged to face the tip of the nano-chain unit, i.e., a corner of the metallic nanoparticle. Photodetection with high wavelength selectivity is performed based on a change in the initial voltage of the current-voltage characteristic.Type: ApplicationFiled: September 2, 2008Publication date: April 9, 2009Applicants: ROHM CO., LTD., National University Corporation Hokkaido UniversityInventors: Kosei Ueno, Hiroaki Misawa, Dai Ohnishi, Takui Sakaguchi, Yoichi Mugino
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Publication number: 20090032735Abstract: There are provided a sensing device, a sensing apparatus, and a sensing method capable of realizing effective multi-photon absorption and local plasmon enhancement function. The sensing device can realize a high multi-photon excitation efficiency and selectivity by accurately controlling the material, shape, size, interval, and direction of metal particles arranged on a substrate. By employing the sensing device in various sensing apparatuses such as a fluorescent sensing apparatus, it is possible to realize sensing of detection object material with a high sensibility.Type: ApplicationFiled: March 17, 2006Publication date: February 5, 2009Inventors: Hiroaki Misawa, Kosei Ueno, Yasuyuki Tsuboi, Keiji Sasaki
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Patent number: 7486433Abstract: A high-luminance quantum correlation photon beam generator in which a laser light source (1) emits a laser pumped light and a parametric crystal (2) generates a pair of two photons of a signal photon and an idler photon on receiving the pumped light to emit two photon beams. Further, a beam splitter (5) splits a signal photon beam (6) from an idler photon beam (7), a mode inverter (10) rotates one of the signal photon beam, (6) and the idler photon beam (7) 180° around its geometric center, a phase adjusting means (8) adjusts phases of the signal photon beam (6) and the idler photon beam (7) based on an optical time delay, and a beam coupling means (14) overlays the signal photon beam (6) with the idler photon beam (7) in a common-line polarized annular shape by the mode inverter (10) to bring them into a quantum correlated state.Type: GrantFiled: September 30, 2005Date of Patent: February 3, 2009Assignee: Japan Science and Technology AgencyInventors: Vygandas Jarutis, Vygantas Mizeikis, Saulius Juodkazis, Hiroaki Misawa
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Publication number: 20080314883Abstract: A laser processing method and apparatus capable of forming an extremely minute modified area not exceeding half the diffraction limit value of the laser wavelength used for processing without causing plasma in a processing object such as a dielectric material substrate or semiconductor material substrate. In this technology, attention is paid to the fact that new damage is caused even at laser intensity that does not cause plasma at all, and a laser beam (1) that has lower laser intensity than the laser intensity threshold at which plasma occurs (for example, approximately 1/1.5 of that laser intensity threshold) is convergently radiated into a processing object (10) using an irradiation optical system (20) accuracy-designed so as not to cause a self-focusing effect at the convergence location (3).Type: ApplicationFiled: April 18, 2005Publication date: December 25, 2008Inventors: Saulius Juodkazis, Oleg Efimov, Hiroaki Misawa, Yasuyuki Tsuboi
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Publication number: 20080160287Abstract: A metal structure capable of significantly increasing wavelength selectivity and polarization electivity for an incident light, and a production method thereof. First, a solid transparent substrate (glass substrate) (10) is cleaned and dried (S100). The surface of the substrate (10) is spin-coated with a positive electron lithography-use resist solution and then baked, and the resist solution is removed to form a resist thin film (20) on the substrate (10) (S200). A specified pattern is drawn on the resist thin film (20) with an electron beam, and the film is developed, rinsed and dried (S300). Then, metals such as chromium and then gold are formed sequentially on the substrate (10) by sputtering (S400). And, excessive resist materials are removed from the surface of the substrate (10) (S500), whereby metal nano-rod array (40) is completed.Type: ApplicationFiled: February 16, 2006Publication date: July 3, 2008Inventors: Hiroaki Misawa, Kosei Ueno, Yasuyuki Tsuboi, Keiji Sasaki
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Publication number: 20080099444Abstract: A micro-fabrication method characterized by comprising the steps of applying a pulse laser beam to a plastic material to be processed exhibiting a glass phase transition by heating and having a heat-shrinkage to form laser-processed patterns on the surface of or in the above plastic material to be processed, and then heat-treating the plastic material to be processed at a temperature not lower than a glass transition temperature Tg to fine the formed patterns by heat-shrinkage.Type: ApplicationFiled: January 17, 2005Publication date: May 1, 2008Inventors: Hiroaki Misawa, Saulius Juodkazis
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Publication number: 20080049302Abstract: A high-luminance quantum correlation photon beam generator a photon beam of a quantum correlated pair characterized by includes: a laser light source (1) operable to emit a laser pumped light; a parametric crystal (2) operable to generate a pair of two photons of a signal photon and an idler photon on receiving the pumped light from the laser light source (1) to emit two photon beams along two non-concentric cones; a beam splitting means (5) operable to split a signal photon beam (6) from an idler photon beam (7); a mode inverter (10) operable to rotate one of the annular signal photon beam (6) and the idler photon beam (7) 180° around its geometric center; a phase adjusting means (8) operable to adjust phases of the signal photon beam (6) and the idler photon beam (7) based on an optical time delay; and a beam coupling means (14) operable to overlay the signal photon beam (6) with the idler photon beam (7) in a common-line polarized annular shape by the mode inverter (10) to bring them into a quantum correlaType: ApplicationFiled: September 30, 2005Publication date: February 28, 2008Inventors: Vygandas Jarutis, Vygantas Mizeikis, Saulius Juodkazis, Hiroaki Misawa
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Publication number: 20060044639Abstract: A method of 3D holographic recording by using a very simple optical system comprises: dividing a femto-second laser pulse into a plurality of light beams by a diffraction beam splitter (3), focusing four light beams selected from the divided plurality of light beam, and further focusing these four light beams into a sample (7) comprised of a photosensitive material capable of multi-photon exposure so that the photosensitive material is exposed to the interference among the four light beams and multi-photon absorption in the sample (7) is induced, thus recording a 3D phase hologram on the irradiated portion of the sample (7).Type: ApplicationFiled: September 26, 2003Publication date: March 2, 2006Inventors: Hiroaki Misawa, Saulius Juodkazis, Shigeki Matsuo, Toshiaki Kondo
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Publication number: 20050232116Abstract: A method of 3D holographic recording by using a very simple optical system comprises: dividing a femto-second laser pulse into a plurality of light beams by a diffraction beam splitter (3), focusing four light beams selected from the divided plurality of light beam, controlling each optical phase of the selected four light beams by a phase retarder (8). and further focusing these four light beams into a sample (7?) comprised of a photosensitive material capable of multi-photon exposure so that the photosensitive material is exposed to the interference among the four light beams and multi-photon absorption in the sample (7?) is induced, thus recording a 3D phase hologram on the irradiated portion of the sample (7?).Type: ApplicationFiled: April 15, 2005Publication date: October 20, 2005Inventors: Hiroaki Misawa, Saulius Juodkazis, Shigeki Matsuo, Toshiaki Kondo
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Patent number: 6086724Abstract: Particulates are trapped by laser beam and brought into contact with electrodes to electrochemically and spectroscopically measure the reaction process thereof.Precise measurement of the process of chemical reactions such as electrochemical and photochemical ones of a single particulate is made possible.Type: GrantFiled: May 30, 1995Date of Patent: July 11, 2000Assignee: Research Development Corporation of JapanInventors: Kiyoharu Nakatani, Hiroaki Misawa, Noboru Kitamura, Tatsuya Uchida
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Patent number: 5694249Abstract: The invention relates to a three-dimensional optical memory element. This element is made of glass and includes: a glass matrix which has a first refractive index; and a plurality of spots which are three-dimensionally distributed in the glass matrix and each of which has a second refractive index different from the first refractive index. The element is prepared by condensing a pulsed laser beam to focal points in the element so as to prepare, at the focal points, the spots corresponding to the focal points. Each focal point has a diameter which is approximately equal to a wavelength of the pulsed laser beam. The element has a sufficient weatherability and a sufficient resistance to heat and light. It is possible to write information at each spot having a diameter equal to or shorter than the wavelength of the laser beam, with high density and good contrast.Type: GrantFiled: October 3, 1995Date of Patent: December 2, 1997Assignee: Central Glass Company, LimitedInventor: Hiroaki Misawa
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Patent number: 5644588Abstract: A microfine light source is provided by a non-spherical particle containing a dye, which is irradiated with a laser beam under conditions that the particle emits light at a plurality of frequencies. A micromemory sensor which employs the light confinement properties of these non-spherical particles is also provided. The microfine light source is applicable to new physical and chemical processes, the processing and modification of particles, and to photon STM.Type: GrantFiled: March 27, 1995Date of Patent: July 1, 1997Assignee: Research Development Corporation of JapanInventor: Hiroaki Misawa
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Patent number: 5393957Abstract: The present invention provides microprocessing and the device therefor which is characterized by radiating proessing pulse laser together with trapping laser to perform the modification and processing of particles and micropcapsules.In the case of using such method for implosion, the reaction group is caused to be released by imploding the micro capsule with the reactive goup enclosed to implosion, permitting specified reaction and processing.Type: GrantFiled: December 9, 1992Date of Patent: February 28, 1995Assignees: Research Development Corporation of Japan, Masanori KoshiokaInventors: Hiroaki Misawa, Keiji Sasaki, Masanori Koshioka, Noboru Kitamura, Hiroshi Masuhara
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Patent number: 5367160Abstract: A method for forming a polymer particle is provided which involved irradiating a polymer solution with a laser beam. The polymer particle is formed at the focal area of the beam. The particle is reversible and disappears upon discontinuing the irradiation. Irreversible particles can be formed by including a reactive monomer in the solution. The particles are trapped by the beam and may be moved for processing and modification by moving the laser beam.Type: GrantFiled: March 1, 1993Date of Patent: November 22, 1994Assignee: Research Development Corporation of JapanInventors: Masazumi Ishikawa, Hiroaki Misawa, Noboru Kitamura
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Patent number: 5359615Abstract: A method for forming microilluminants, which comprises the steps of irradiating laser beam to microparticles doped with a laser pigment in a liquid medium, trapping the microparticles and causing these microparticles to emit light.According to this method, it is possible to form microilluminants, permitting application to new physical and chemical processes and to processing and modification of microparticles, and new developments such as optical STM.Type: GrantFiled: November 23, 1992Date of Patent: October 25, 1994Assignee: Research Development Corporation of JapanInventors: Keiji Sasaki, Hiroaki Misawa, Ryo Fujisawa, Noboru Kitamura
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Patent number: 5308976Abstract: Irradiating a plurality of laser beams onto different microparticles or different groups of microparticles, and trapping and/or manipulating these microparticles or groups of microparticles. This method permits manipulation of microparticles with a plurality of trapping laser beams not mutually interfering just as with two human hands. By coaxially introducing an excited laser beam, it is possible to induce chemical reactions for processing or assembling.Type: GrantFiled: May 29, 1992Date of Patent: May 3, 1994Assignee: Research Development Corp. of JapanInventors: Hiroaki Misawa, Keiji Sasaki, Nobura Kitamura
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Patent number: 5283417Abstract: The present invention provides microprocessing and the device therefor which is characterized by radiating proessing pulse laser together with trapping laser to perform the modification and processing of particles and microcapsules.In the case of using such method for implosion, the reaction group is caused to be released by imploding the microcapsule with the reactive goup enclosed to implosion, permitting specified reaction and processing.Type: GrantFiled: December 7, 1990Date of Patent: February 1, 1994Assignee: Research Development Corporation of JapanInventors: Hiroaki Misawa, Keiji Sasaki, Masanori Koshioka, Noboru Kitamura, Hiroshi Masuhara
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Patent number: 5212382Abstract: This invention provides laser trapping designed to trap a microparticle or a group of microparticles by scanning at least a focused laser beam at high speed.This laser trapping make it possible to control the formation of microparticles into a specified pattern according to the scanning form of the focused laser beam, fix and transport said pattern, and trap and manipulate the microparticles with lower index of refraction than that of a medium, or other photoreflective microparticles such as a metal. Consequently, with increasing degree of freedom of processing and modification on various microparticles, the field of application expands.Type: GrantFiled: December 13, 1991Date of Patent: May 18, 1993Inventors: Keiji Sasaki, Hiroaki Misawa, Noboru Kitamura