Unidirectional propagation of coupled edge states in sandwich topological photonic crystals
Topological photonic crystals (PCs) with exotic optical properties such as helical edge states have tremendous potential applications in the fields of photonic integrated circuits. Here, we propose a sandwich PC structure based on trivial-nontrivial-trivial topology with a robust unidirectional ligh...
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| Veröffentlicht in: | Journal of applied physics 2018-12, Vol.124 (21) |
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| container_title | Journal of applied physics |
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| creator | Gao, Yong-Feng Jiang, Zhen Zhang, Lu-Lu He, Liu Zhao, Jian |
| description | Topological photonic crystals (PCs) with exotic optical properties such as helical edge states have tremendous potential applications in the fields of photonic integrated circuits. Here, we propose a sandwich PC structure based on trivial-nontrivial-trivial topology with a robust unidirectional light propagation through coupling of two helical edge states in the nontrivial topological region. We calculate dispersion relations of the sandwich structures and observe a robust unidirectional light propagation excited by an external point source with orbital angular momentum. To evaluate the stability of light flow, a Z-shaped corner is established and positions or radii of several cylinders are changed randomly. Results show that the unidirectional propagation remains stable in the imperfect structures. The configuration may find potential applications for the construction of nanophotonic circuits. |
| doi_str_mv | 10.1063/1.5047647 |
| format | Article |
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Here, we propose a sandwich PC structure based on trivial-nontrivial-trivial topology with a robust unidirectional light propagation through coupling of two helical edge states in the nontrivial topological region. We calculate dispersion relations of the sandwich structures and observe a robust unidirectional light propagation excited by an external point source with orbital angular momentum. To evaluate the stability of light flow, a Z-shaped corner is established and positions or radii of several cylinders are changed randomly. Results show that the unidirectional propagation remains stable in the imperfect structures. 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Here, we propose a sandwich PC structure based on trivial-nontrivial-trivial topology with a robust unidirectional light propagation through coupling of two helical edge states in the nontrivial topological region. We calculate dispersion relations of the sandwich structures and observe a robust unidirectional light propagation excited by an external point source with orbital angular momentum. To evaluate the stability of light flow, a Z-shaped corner is established and positions or radii of several cylinders are changed randomly. Results show that the unidirectional propagation remains stable in the imperfect structures. The configuration may find potential applications for the construction of nanophotonic circuits.</description><subject>Angular momentum</subject><subject>Applied physics</subject><subject>Cylinders</subject><subject>Flow stability</subject><subject>Integrated circuits</subject><subject>Optical properties</subject><subject>Photonic crystals</subject><subject>Propagation</subject><subject>Sandwich structures</subject><subject>Stability analysis</subject><subject>Topology</subject><issn>0021-8979</issn><issn>1089-7550</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2018</creationdate><recordtype>article</recordtype><recordid>eNp90E1LAzEQBuAgCtbqwX8Q8KSwNcnuJpujFL-g4MWePIR0km1T1s2apEr_vakVPQiehoFnhpkXoXNKJpTw8ppOalIJXokDNKKkkYWoa3KIRoQwWjRSyGN0EuOaEEqbUo7Qy7x3xgULyfled3gIftBLveuwbzH4zdBZg61ZWhyTTjZi1-Ooe_PhYIWTH3znlw52oyuffO8AQ9hm2sVTdNTmYs--6xjN726fpw_F7On-cXozK6BkIhWC2QU33JhGCy6lZAsqJLOWwYIyU2mhbcsa0Exqawgw2TJaSaNr0AKE5eUYXez35uPfNjYmtfabkL-JitE621LwJqvLvYLgYwy2VUNwrzpsFSVql52i6ju7bK_2NoJLX2H84HcffqEaTPsf_rv5Ew9_fz8</recordid><startdate>20181207</startdate><enddate>20181207</enddate><creator>Gao, Yong-Feng</creator><creator>Jiang, Zhen</creator><creator>Zhang, Lu-Lu</creator><creator>He, Liu</creator><creator>Zhao, Jian</creator><general>American Institute of Physics</general><scope>AAYXX</scope><scope>CITATION</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><orcidid>https://orcid.org/0000-0002-1049-5970</orcidid></search><sort><creationdate>20181207</creationdate><title>Unidirectional propagation of coupled edge states in sandwich topological photonic crystals</title><author>Gao, Yong-Feng ; Jiang, Zhen ; Zhang, Lu-Lu ; He, Liu ; Zhao, Jian</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c327t-72eb6d6dd8a769992b1792ee2cb12d4a7aef28ca29aed0c29f2149da5ca7c7e63</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2018</creationdate><topic>Angular momentum</topic><topic>Applied physics</topic><topic>Cylinders</topic><topic>Flow stability</topic><topic>Integrated circuits</topic><topic>Optical properties</topic><topic>Photonic crystals</topic><topic>Propagation</topic><topic>Sandwich structures</topic><topic>Stability analysis</topic><topic>Topology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Gao, Yong-Feng</creatorcontrib><creatorcontrib>Jiang, Zhen</creatorcontrib><creatorcontrib>Zhang, Lu-Lu</creatorcontrib><creatorcontrib>He, Liu</creatorcontrib><creatorcontrib>Zhao, Jian</creatorcontrib><collection>CrossRef</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Journal of applied physics</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Gao, Yong-Feng</au><au>Jiang, Zhen</au><au>Zhang, Lu-Lu</au><au>He, Liu</au><au>Zhao, Jian</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Unidirectional propagation of coupled edge states in sandwich topological photonic crystals</atitle><jtitle>Journal of applied physics</jtitle><date>2018-12-07</date><risdate>2018</risdate><volume>124</volume><issue>21</issue><issn>0021-8979</issn><eissn>1089-7550</eissn><coden>JAPIAU</coden><abstract>Topological photonic crystals (PCs) with exotic optical properties such as helical edge states have tremendous potential applications in the fields of photonic integrated circuits. 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| language | eng |
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| source | AIP Journals Complete; Alma/SFX Local Collection |
| subjects | Angular momentum Applied physics Cylinders Flow stability Integrated circuits Optical properties Photonic crystals Propagation Sandwich structures Stability analysis Topology |
| title | Unidirectional propagation of coupled edge states in sandwich topological photonic crystals |
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