Singular Points of Polarizations in the Momentum Space of Photonic Crystal Slabs
Bound states in the continuum (BICs), circularly polarized states (C points) and degenerate states are all of three types of singular points of polarization in the momentum space. For photonic crystal slabs (PhCSs) with linearly polarized far fields, BICs were found to be the centers of polarization...
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Veröffentlicht in: | Physical review letters 2020-04, Vol.124 (15), p.153904-153904, Article 153904 |
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creator | Ye, Weimin Gao, Yang Liu, Jianlong |
description | Bound states in the continuum (BICs), circularly polarized states (C points) and degenerate states are all of three types of singular points of polarization in the momentum space. For photonic crystal slabs (PhCSs) with linearly polarized far fields, BICs were found to be the centers of polarization vortices and attracted more attention in the previous studies. Here, we theoretically demonstrate that the far fields of PhCSs can exhibit remarkably diverse polarizations due to the robust existences of C points in the continuum. Only a pair of C points with identical handedness and opposite topological charge can be annihilated together. Continuously fine tuning of the structure parameters of PhCSs without breaking their symmetry, a pair of C points with identical topological charge and opposite handedness are able to merge into a BIC, then the BIC splits into C points again. Interestingly, a Dirac-degenerate BIC with one-half of topological charge is observed when two pairs of C points with identical topological charge from the upper and lower band, respectively, simultaneously merge at the Dirac-degenerate point. The law of topological charge conservation is verified to play an important role in the evolutions and interconversions between different types of polarization singularities. Our findings might shed light on the origin of singular points of polarization, could open a gateway towards the applications of them in the generation and manipulation of vector beams. |
doi_str_mv | 10.1103/physrevlett.124.153904 |
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For photonic crystal slabs (PhCSs) with linearly polarized far fields, BICs were found to be the centers of polarization vortices and attracted more attention in the previous studies. Here, we theoretically demonstrate that the far fields of PhCSs can exhibit remarkably diverse polarizations due to the robust existences of C points in the continuum. Only a pair of C points with identical handedness and opposite topological charge can be annihilated together. Continuously fine tuning of the structure parameters of PhCSs without breaking their symmetry, a pair of C points with identical topological charge and opposite handedness are able to merge into a BIC, then the BIC splits into C points again. Interestingly, a Dirac-degenerate BIC with one-half of topological charge is observed when two pairs of C points with identical topological charge from the upper and lower band, respectively, simultaneously merge at the Dirac-degenerate point. The law of topological charge conservation is verified to play an important role in the evolutions and interconversions between different types of polarization singularities. Our findings might shed light on the origin of singular points of polarization, could open a gateway towards the applications of them in the generation and manipulation of vector beams.</description><identifier>ISSN: 0031-9007</identifier><identifier>EISSN: 1079-7114</identifier><identifier>DOI: 10.1103/physrevlett.124.153904</identifier><identifier>PMID: 32357068</identifier><language>eng</language><publisher>United States: American Physical Society</publisher><subject>Circular polarization ; Linear polarization ; Momentum ; Photonic crystals ; Topology</subject><ispartof>Physical review letters, 2020-04, Vol.124 (15), p.153904-153904, Article 153904</ispartof><rights>Copyright American Physical Society Apr 17, 2020</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c405t-e9c23edceb601e21853a2fb201c5d66d5ac7f8231b3663a877f94dbc78961f293</citedby><cites>FETCH-LOGICAL-c405t-e9c23edceb601e21853a2fb201c5d66d5ac7f8231b3663a877f94dbc78961f293</cites><orcidid>0000-0001-5408-9934</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,2876,2877,27924,27925</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/32357068$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Ye, Weimin</creatorcontrib><creatorcontrib>Gao, Yang</creatorcontrib><creatorcontrib>Liu, Jianlong</creatorcontrib><title>Singular Points of Polarizations in the Momentum Space of Photonic Crystal Slabs</title><title>Physical review letters</title><addtitle>Phys Rev Lett</addtitle><description>Bound states in the continuum (BICs), circularly polarized states (C points) and degenerate states are all of three types of singular points of polarization in the momentum space. For photonic crystal slabs (PhCSs) with linearly polarized far fields, BICs were found to be the centers of polarization vortices and attracted more attention in the previous studies. Here, we theoretically demonstrate that the far fields of PhCSs can exhibit remarkably diverse polarizations due to the robust existences of C points in the continuum. Only a pair of C points with identical handedness and opposite topological charge can be annihilated together. Continuously fine tuning of the structure parameters of PhCSs without breaking their symmetry, a pair of C points with identical topological charge and opposite handedness are able to merge into a BIC, then the BIC splits into C points again. Interestingly, a Dirac-degenerate BIC with one-half of topological charge is observed when two pairs of C points with identical topological charge from the upper and lower band, respectively, simultaneously merge at the Dirac-degenerate point. The law of topological charge conservation is verified to play an important role in the evolutions and interconversions between different types of polarization singularities. Our findings might shed light on the origin of singular points of polarization, could open a gateway towards the applications of them in the generation and manipulation of vector beams.</description><subject>Circular polarization</subject><subject>Linear polarization</subject><subject>Momentum</subject><subject>Photonic crystals</subject><subject>Topology</subject><issn>0031-9007</issn><issn>1079-7114</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2020</creationdate><recordtype>article</recordtype><recordid>eNpdkF1LwzAUhoMobk7_wgh4401nPtp8XMrwCyYOp9clTVNXaZPapIP5683c9MKrcw4878vhAWCK0QxjRK-79db3ZtOYEGaYpDOcUYnSIzDGiMuEY5wegzFCFCcSIT4CZ95_IIQwYeIUjCihGUdMjMFyVdv3oVE9XLraBg9dFbd4118q1M56WFsY1gY-udbYMLRw1SltfrC1C87WGs77rQ-qgatGFf4cnFSq8ebiMCfg7e72df6QLJ7vH-c3i0SnKAuJkZpQU2pTMIQNwSKjilQFQVhnJWNlpjSvBKG4oIxRJTivZFoWmgvJcEUknYCrfW_Xu8_B-JC3tdemaZQ1bvA5oZIzLjJCI3r5D_1wQ2_jdzsqlVQwsStke0r3zke3Vd71dav6bY5RvnOeL6PzF7NZROd5dJ7vncfg9FA_FK0p_2K_kuk3mlZ_0g</recordid><startdate>20200417</startdate><enddate>20200417</enddate><creator>Ye, Weimin</creator><creator>Gao, Yang</creator><creator>Liu, Jianlong</creator><general>American Physical Society</general><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>H8D</scope><scope>L7M</scope><scope>7X8</scope><orcidid>https://orcid.org/0000-0001-5408-9934</orcidid></search><sort><creationdate>20200417</creationdate><title>Singular Points of Polarizations in the Momentum Space of Photonic Crystal Slabs</title><author>Ye, Weimin ; Gao, Yang ; Liu, Jianlong</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c405t-e9c23edceb601e21853a2fb201c5d66d5ac7f8231b3663a877f94dbc78961f293</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2020</creationdate><topic>Circular polarization</topic><topic>Linear polarization</topic><topic>Momentum</topic><topic>Photonic crystals</topic><topic>Topology</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Ye, Weimin</creatorcontrib><creatorcontrib>Gao, Yang</creatorcontrib><creatorcontrib>Liu, Jianlong</creatorcontrib><collection>PubMed</collection><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Aerospace Database</collection><collection>Advanced Technologies Database with Aerospace</collection><collection>MEDLINE - Academic</collection><jtitle>Physical review letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Ye, Weimin</au><au>Gao, Yang</au><au>Liu, Jianlong</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Singular Points of Polarizations in the Momentum Space of Photonic Crystal Slabs</atitle><jtitle>Physical review letters</jtitle><addtitle>Phys Rev Lett</addtitle><date>2020-04-17</date><risdate>2020</risdate><volume>124</volume><issue>15</issue><spage>153904</spage><epage>153904</epage><pages>153904-153904</pages><artnum>153904</artnum><issn>0031-9007</issn><eissn>1079-7114</eissn><abstract>Bound states in the continuum (BICs), circularly polarized states (C points) and degenerate states are all of three types of singular points of polarization in the momentum space. For photonic crystal slabs (PhCSs) with linearly polarized far fields, BICs were found to be the centers of polarization vortices and attracted more attention in the previous studies. Here, we theoretically demonstrate that the far fields of PhCSs can exhibit remarkably diverse polarizations due to the robust existences of C points in the continuum. Only a pair of C points with identical handedness and opposite topological charge can be annihilated together. Continuously fine tuning of the structure parameters of PhCSs without breaking their symmetry, a pair of C points with identical topological charge and opposite handedness are able to merge into a BIC, then the BIC splits into C points again. Interestingly, a Dirac-degenerate BIC with one-half of topological charge is observed when two pairs of C points with identical topological charge from the upper and lower band, respectively, simultaneously merge at the Dirac-degenerate point. The law of topological charge conservation is verified to play an important role in the evolutions and interconversions between different types of polarization singularities. Our findings might shed light on the origin of singular points of polarization, could open a gateway towards the applications of them in the generation and manipulation of vector beams.</abstract><cop>United States</cop><pub>American Physical Society</pub><pmid>32357068</pmid><doi>10.1103/physrevlett.124.153904</doi><tpages>1</tpages><orcidid>https://orcid.org/0000-0001-5408-9934</orcidid></addata></record> |
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subjects | Circular polarization Linear polarization Momentum Photonic crystals Topology |
title | Singular Points of Polarizations in the Momentum Space of Photonic Crystal Slabs |
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