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公开(公告)号：US20240429680A1
公开(公告)日：2024-12-26
申请号：US18829861
申请日：2024-09-10
Applicant: KYOTO UNIVERSITY , STANLEY ELECTRIC CO., LTD.
Inventor： Susumu NODA , Yoshinori TANAKA , Menaka DE ZOYSA , Kenji ISHIZAKI , Tomoaki KOIZUMI , Kei EMOTO
Abstract: A surface emitting laser element includes a substrate and a hexagonal semiconductor structure layer formed on the substrate which emits a light from an upper surface side or a bottom surface side The semiconductor structure layer includes a first clad layer of a first conductivity type, a first guide layer of the first conductivity type having a photonic crystal layer and a first embedding layer, a second embedding layer, an active layer, second guide layer, and a second clad layer of a second conductivity type. The photonic crystal layer has a plurality of voids disposed having two-dimensional periodicity when viewed from above. The first embedding layer is formed on an upper side of the photonic crystal layer and closes openings of the voids. And an oxygen concentration of the second embedding layer is less than an oxygen concentration of the first embedding layer.
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公开(公告)号：US20210328406A1
公开(公告)日：2021-10-21
申请号：US17272385
申请日：2019-08-29
Applicant: KYOTO UNIVERSITY , STANLEY ELECTRIC CO., LTD.
Inventor： Susumu NODA , Yoshinori TANAKA , Menaka DE ZOYSA , Kenji ISHIZAKI , Tomoaki KOIZUMI , Kei EMOTO
Abstract: A surface emitting laser element formed of a group III nitride semiconductor, comprising: a first clad layer of a first conductivity type; a first guide layer of the first conductivity type having a photonic crystal layer formed on the first clad layer including voids disposed having two-dimensional periodicity in a surface parallel to the layer and a first embedding layer formed on the photonic crystal layer; a second embedding layer formed on the first embedding layer by crystal growth; an active layer formed on the second embedding layer; a second guide layer formed on the active layer; and a second clad layer of a second conductivity type formed on the second guide layer, the second conductivity type being a conductivity type opposite to the first conductivity type. The first embedding layer has a surface including pits disposed at surface positions corresponding to the voids.
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公开(公告)号：US20230361530A1
公开(公告)日：2023-11-09
申请号：US17908202
申请日：2021-03-17
Applicant: KYOTO UNIVERSITY , MITSUBISHI ELECTRIC CORPORATION
Inventor： Susumu NODA , Menaka DE ZOYSA , Kenji ISHIZAKI , Wataru KUNISHI , Kentaro ENOKI
CPC classification number: H01S5/11 , H01S5/04256 , H01S5/2027 , H01S5/3095 , H01S5/04254 , H01S5/34313
Abstract: A two-dimensional photonic-crystal laser includes: a substrate made of an n-type semiconductor; a p-type cladding layer on an upper side of the substrate made of a p-type semiconductor; an active layer on an upper side of the cladding layer; a two-dimensional photonic-crystal layer on an upper side of the active layer including a plate-shaped base body made of an n-type semiconductor wherein modified refractive index areas whose refractive index differs from the base body are arranged; a first tunnel layer between the substrate and cladding layer made of an n-type semiconductor having a carrier density higher than the substrate's; a second tunnel layer between the first tunnel and cladding layers, made of a p-type semiconductor having a carrier density higher than the p-type semiconductor layer's; a first electrode on a lower side of or in the substrate; and a second electrode on an upper side of the two-dimensional photonic-crystal layer.
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公开(公告)号：US20240170917A1
公开(公告)日：2024-05-23
申请号：US18281791
申请日：2022-03-04
Applicant: Sumitomo Electric Industries, Ltd. , Kyoto University
Inventor： Naoki FUJIWARA , Naoya KONO , Akira FURUYA , Yuki ITO , Susumu NODA , Takuya INOUE , Kenji ISHIZAKI
CPC classification number: H01S5/11 , H01S5/04254 , H01S5/04256 , H01S5/06226 , H01S5/18 , H01S5/2086
Abstract: A photonic crystal surface-emitting laser includes a light emitting region from which light is emitted in a direction crossing an in-plane direction, and a current blocking region that is adjacent to the light emitting region in the in-plane direction and in which current is less likely to flow than in the light emitting region. The light emitting region and the current blocking region each include a photonic crystal layer. The photonic crystal layer has a first region and second regions periodically arranged in the first region. A refractive index of each of the second regions is different from that of the first region. The light emitting region includes a first semiconductor layer, an active layer, and a second semiconductor layer. The first semiconductor layer, the active layer, and the second semiconductor layer are sequentially stacked on top of one another in an emission direction of the light.
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Patent Agency Ranking
公开(公告)号：US20240047944A1
公开(公告)日：2024-02-08
申请号：US18266311
申请日：2021-10-29
Applicant: Sumitomo Electric Industries, Ltd. , Kyoto University
Inventor： Naoya KONO , Yuki ITO , Naoki FUJIWARA , Susumu NODA , Takuya INOUE , Menaka De ZOYSA , Kenji ISHIZAKI
CPC classification number: H01S5/11 , H01S5/185 , H01S5/04254 , H01S5/04253
Abstract: A photonic-crystal surface emitting laser includes a first semiconductor layer, a photonic crystal layer having a refractive index higher than a refractive index of the first semiconductor layer and provided on the first semiconductor layer, and an active layer provided opposite to the first semiconductor layer with respect to the photonic crystal layer. The photonic crystal layer has a first region and a plurality of second regions each having a refractive index different from a refractive index of the first region and periodically disposed in the first region in a plane of the photonic crystal layer. The second regions extend from the photonic crystal layer to the first semiconductor layer.
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公开(公告)号：US20240128717A1
公开(公告)日：2024-04-18
申请号：US18275963
申请日：2022-02-24
Applicant: KYOTO UNIVERSITY
Inventor： Susumu NODA , Menaka DE ZOYSA , Ryoichi SAKATA , Kenji ISHIZAKI , Takuya INOUE , Masahiro YOSHIDA
CPC classification number: H01S5/11 , H01S5/04256 , H01S5/18
Abstract: A two-dimensional photonic crystal laser includes: electrodes; an active layer; and a two-dimensional photonic crystal layer in which modified refractive index regions are disposed to be shifted by different shift amounts from respective lattice points or/and are disposed at the respective lattice points with different areas, the shift amount or/and the area is/are modified with a composite modulation period and expressed by a modulation phase Ψ(r↑) expressed using a vector r↑ indicating a position of each lattice point of the two-dimensional lattice, a vector kn↑ indicating a combination of an inclination angle and an azimuthal angle of each of n laser beams mutually differing in the inclination angle and/or the azimuthal angle, and an amplitude An and a phase exp(iαn) determined for each n and the amplitude An and/or the phase exp(iαn) for each value of n differ(s) from each other in at least two different values of n.
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公开(公告)号：US20240120710A1
公开(公告)日：2024-04-11
申请号：US18275821
申请日：2022-02-24
Applicant: KYOTO UNIVERSITY
Inventor： Susumu NODA , Takuya INOUE , Masahiro YOSHIDA , Kenji ISHIZAKI
Abstract: A two-dimensional photonic-crystal surface-emitting laser includes: a two-dimensional photonic-crystal layer; an active layer provided on one surface side of the two-dimensional photonic-crystal layer; and a reflection layer provided on the other surface side of the two-dimensional photonic-crystal layer or on a side opposite to the two-dimensional photonic-crystal layer so as to be spaced apart from the two-dimensional photonic-crystal layer, wherein a distance d between surfaces of the two-dimensional photonic-crystal layer and the reflection layer facing each other is set such that a radiation coefficient difference Δαv=(αv1−αv0), which is a value obtained by subtracting a radiation coefficient αv0 of a fundamental mode having the smallest loss from a radiation coefficient αv1 of a first higher order mode having the second smallest loss among the light amplified in the two-dimensional photonic-crystal layer, is 1 cm−1 or more.
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公开(公告)号：US20230163566A1
公开(公告)日：2023-05-25
申请号：US17916116
申请日：2021-03-30
Applicant: KYOTO UNIVERSITY
Inventor： Susumu NODA , Masahiro YOSHIDA , Menaka DE ZOYSA , Kenji ISHIZAKI
CPC classification number: H01S5/11 , H01S5/34313 , H01S5/04254 , H01S5/04256 , H01S2301/18
Abstract: A two-dimensional photonic-crystal laser formed by sandwiching, between a first electrode and a second electrode, a layered body including an active layer and a two-dimensional photonic-crystal layer in which modified refractive index areas having a refractive index different from a refractive index of a plate-shaped base body are periodically arranged two-dimensionally on the base body. The first electrode is divided into a plurality of partial electrodes, and the second electrode is a frame-shaped electrode including a frame-shaped portion made of a conductor, the second electrode having a window portion which is a space inside the frame-shaped portion being arranged to face a region enclosing a plurality of the partial electrodes. A lens provided on the side opposite to the layered body of the second electrode in a manner covering the entire window portion is included.
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公开(公告)号：US20220128696A1
公开(公告)日：2022-04-28
申请号：US17569922
申请日：2022-01-06
Applicant: ROHM CO., LTD. , KYOTO UNIVERSITY
Inventor： Susumu NODA , Takuya KUSHIMOTO , Menaka DE ZOYSA , Yoshinori TANAKA , Kenji ISHIZAKI , Eiji MIYAI , Wataru KUNISHI
IPC: G01S17/894 , G01S7/4865 , G01S7/48 , G01S7/484
Abstract: The 3D sensing system includes: a PC laser array in which PC laser elements are arranged on a plane; a control unit configured to control an operation mode of a laser light source; a driving unit configured to execute a drive control of the PC laser array in accordance with an operation mode controlled by the control unit; a light receiving unit configured to receive reflected light that is laser light emitted from the PC laser array and reflected from a measuring object; a signal processing unit configured to execute signal processing of the reflected light received by the light receiving unit in accordance with the operation mode; and a distance calculation unit configure to execute calculation processing of a distance to the measuring object with respect to a signal processed by the signal processing unit, in accordance with the operation mode, and to output distance data.
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