{"id":"https://openalex.org/A5061145232","orcid":null,"observed_orcids":[],"display_name":"Koji Hiraiwa","raw_author_names":["HIRAIWA, KOJI","K. Hiraiwa","Koji Hiraiwa","\u5e73\u5ca9 \u6d69\u4e8c","\u5e73\u5ca9\u6d69\u4e8c","\u6d69\u4e8c \u5e73\u5ca9"],"full_name":"Koji Hiraiwa","works_count":33,"cited_by_count":164,"summary_stats":{"2yr_mean_citedness":0.0,"h_index":7,"i10_index":5},"ids":{"openalex":"https://openalex.org/A5061145232","orcid":null,"observed_orcids":[]},"affiliations":[{"institution":{"id":"https://openalex.org/I4210157335","ror":"https://ror.org/05xe0se54","display_name":"Furukawa Electric (Japan)","country_code":"JP","type":"company","lineage":["https://openalex.org/I4210157335"]},"years":[2013,2012,2011,2010,2009,2002,1999,1997]},{"institution":{"id":"https://openalex.org/I4405273934","ror":"https://ror.org/00qshf138","display_name":"Furukawa Co., Ltd. (Japan)","country_code":"JP","type":"company","lineage":["https://openalex.org/I4405273934"]},"years":[2013,2012,2011,2010,2009,2002,1999]}],"last_known_institutions":[{"id":"https://openalex.org/I4210157335","ror":"https://ror.org/05xe0se54","display_name":"Furukawa Electric (Japan)","country_code":"JP","type":"company","lineage":["https://openalex.org/I4210157335"]},{"id":"https://openalex.org/I4405273934","ror":"https://ror.org/00qshf138","display_name":"Furukawa Co., Ltd. (Japan)","country_code":"JP","type":"company","lineage":["https://openalex.org/I4405273934"]}],"topics":[{"id":"https://openalex.org/T11429","display_name":"Semiconductor Lasers and Optical Devices","count":33,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10299","display_name":"Photonic and Optical Devices","count":31,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10022","display_name":"Semiconductor Quantum Structures and Devices","count":19,"subfield":{"id":"https://openalex.org/subfields/3107","display_name":"Atomic and Molecular Physics, and Optics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T14158","display_name":"Optical Systems and Laser Technology","count":7,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11637","display_name":"Advanced Semiconductor Detectors and Materials","count":3,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"topic_share":[{"id":"https://openalex.org/T10299","display_name":"Photonic and Optical Devices","value":0.0001015,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11429","display_name":"Semiconductor Lasers and Optical Devices","value":8.27e-05,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10022","display_name":"Semiconductor Quantum Structures and Devices","value":5.05e-05,"subfield":{"id":"https://openalex.org/subfields/3107","display_name":"Atomic and Molecular Physics, and Optics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T14158","display_name":"Optical Systems and Laser Technology","value":4.38e-05,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T12309","display_name":"solar cell performance optimization","value":1.77e-05,"subfield":{"id":"https://openalex.org/subfields/2208","display_name":"Electrical and Electronic Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"x_concepts":[{"id":"192562407","wikidata":"https://www.wikidata.org/wiki/Q228736","display_name":"Materials science","score":0.8413711786270142},{"id":"49040817","wikidata":"https://www.wikidata.org/wiki/Q193091","display_name":"Optoelectronics","score":0.7717156410217285},{"id":"41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","score":0.6234977841377258},{"id":"120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","score":0.5200866460800171},{"id":"121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","score":0.35492485761642456}],"counts_by_year":[{"year":1994,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1995,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1997,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":1999,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":2002,"works_count":5,"oa_works_count":0,"cited_by_count":0},{"year":2003,"works_count":1,"oa_works_count":0,"cited_by_count":0},{"year":2009,"works_count":7,"oa_works_count":0,"cited_by_count":0},{"year":2010,"works_count":4,"oa_works_count":0,"cited_by_count":0},{"year":2011,"works_count":6,"oa_works_count":0,"cited_by_count":0},{"year":2012,"works_count":5,"oa_works_count":0,"cited_by_count":25},{"year":2013,"works_count":1,"oa_works_count":0,"cited_by_count":17},{"year":2014,"works_count":0,"oa_works_count":0,"cited_by_count":20},{"year":2015,"works_count":0,"oa_works_count":0,"cited_by_count":17},{"year":2016,"works_count":0,"oa_works_count":0,"cited_by_count":4},{"year":2017,"works_count":0,"oa_works_count":0,"cited_by_count":12},{"year":2018,"works_count":0,"oa_works_count":0,"cited_by_count":13},{"year":2019,"works_count":0,"oa_works_count":0,"cited_by_count":4},{"year":2020,"works_count":0,"oa_works_count":0,"cited_by_count":2},{"year":2021,"works_count":0,"oa_works_count":0,"cited_by_count":7},{"year":2022,"works_count":0,"oa_works_count":0,"cited_by_count":1},{"year":2023,"works_count":0,"oa_works_count":0,"cited_by_count":2},{"year":2024,"works_count":0,"oa_works_count":0,"cited_by_count":3},{"year":2025,"works_count":0,"oa_works_count":0,"cited_by_count":2},{"year":2026,"works_count":0,"oa_works_count":0,"cited_by_count":4}],"display_name_alternatives":["HIRAIWA, KOJI","K. Hiraiwa","Koji Hiraiwa","\u5e73\u5ca9 \u6d69\u4e8c","\u5e73\u5ca9\u6d69\u4e8c","\u6d69\u4e8c \u5e73\u5ca9"],"block_key":"k hiraiwa","works_api_url":"https://api.openalex.org/works?filter=author.id:A5061145232","awards_count":0,"updated_date":"2026-11-08T12:57:04","created_date":"2016-06-24T00:00:00"}