Paulo dos Santos, João Mendes, J. Pérez‐Juste, I. Pastoriza‐Santos, Jose Almeida, Luis Coelho
{"title":"From localized to propagating surface plasmon resonances in Au nanoparticle coated optical fiber sensors and its implications in biosensing","authors":"Paulo dos Santos, João Mendes, J. Pérez‐Juste, I. Pastoriza‐Santos, Jose Almeida, Luis Coelho","doi":"10.1364/prj.518181","DOIUrl":"https://doi.org/10.1364/prj.518181","url":null,"abstract":"","PeriodicalId":509469,"journal":{"name":"Photonics Research","volume":"46 14","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141663734","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Yanyan Zhang, Mingkun Li, Pan Zhang, Yueqing Du, Shibang Ma, Yuanshan Liu, Sida Xing, Shougang Zhang
{"title":"Two-octave frequency combs from an all-silica-fiber implementation","authors":"Yanyan Zhang, Mingkun Li, Pan Zhang, Yueqing Du, Shibang Ma, Yuanshan Liu, Sida Xing, Shougang Zhang","doi":"10.1364/prj.531386","DOIUrl":"https://doi.org/10.1364/prj.531386","url":null,"abstract":"","PeriodicalId":509469,"journal":{"name":"Photonics Research","volume":"117 36","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141665338","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hua Zhong, Yaroslav Kartashov, Yongdong Li, Ming Li, Yiqi Zhang
Topological insulators are most frequently constructed using lattices with specific degeneracies in their linear spectra, such as Dirac points. For a broad class of lattices, such as honeycomb ones, these points and associated Dirac cones generally appear in non-equivalent pairs. Simultaneous breakup of the time-reversal and inversion symmetry in systems based on such lattices may result in the formation of the unpaired Dirac cones in bulk spectrum, but the existence of topologically protected edge states in such structures remains an open problem. Here photonic Floquet insulator on honeycomb lattice with unpaired Dirac cones in its spectrum is introduced that can support unidirectional edge states appearing at the edge between two regions with opposite sublattice detuning. Topological properties of this system are characterized by the nonzero valley Chern number. Remarkably, edge states in this system can circumvent sharp corners without inter-valley scattering even though there is no total forbidden gap in the spectrum. Our results reveal unusual interplay between two different physical mechanisms of creation of topological edge states based on simultaneous breakup of different symmetries of the system.
{"title":"Topological edge states in photonic Floquet insulator with unpaired Dirac cones","authors":"Hua Zhong, Yaroslav Kartashov, Yongdong Li, Ming Li, Yiqi Zhang","doi":"10.1364/prj.524824","DOIUrl":"https://doi.org/10.1364/prj.524824","url":null,"abstract":"Topological insulators are most frequently constructed using lattices with specific degeneracies in their linear spectra, such as Dirac points. For a broad class of lattices, such as honeycomb ones, these points and associated Dirac cones generally appear in non-equivalent pairs. Simultaneous breakup of the time-reversal and inversion symmetry in systems based on such lattices may result in the formation of the unpaired Dirac cones in bulk spectrum, but the existence of topologically protected edge states in such structures remains an open problem. Here photonic Floquet insulator on honeycomb lattice with unpaired Dirac cones in its spectrum is introduced that can support unidirectional edge states appearing at the edge between two regions with opposite sublattice detuning. Topological properties of this system are characterized by the nonzero valley Chern number. Remarkably, edge states in this system can circumvent sharp corners without inter-valley scattering even though there is no total forbidden gap in the spectrum. Our results reveal unusual interplay between two different physical mechanisms of creation of topological edge states based on simultaneous breakup of different symmetries of the system.","PeriodicalId":509469,"journal":{"name":"Photonics Research","volume":" 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141676605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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