{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,23]],"date-time":"2026-03-23T10:08:04Z","timestamp":1774260484495,"version":"3.50.1"},"reference-count":14,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2018,9,22]],"date-time":"2018-09-22T00:00:00Z","timestamp":1537574400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003453","name":"Natural Science Foundation of Guangdong Province","doi-asserted-by":"publisher","award":["2016A030313670"],"award-info":[{"award-number":["2016A030313670"]}],"id":[{"id":"10.13039\/501100003453","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003453","name":"Natural Science Foundation of Guangdong Province","doi-asserted-by":"publisher","award":["2018A030307027"],"award-info":[{"award-number":["2018A030307027"]}],"id":[{"id":"10.13039\/501100003453","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["11747074"],"award-info":[{"award-number":["11747074"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["61705025"],"award-info":[{"award-number":["61705025"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100007162","name":"Guangdong Science and Technology Department","doi-asserted-by":"publisher","award":["2016A010103041"],"award-info":[{"award-number":["2016A010103041"]}],"id":[{"id":"10.13039\/501100007162","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100007162","name":"Guangdong Science and Technology Department","doi-asserted-by":"publisher","award":["2017A010103025"],"award-info":[{"award-number":["2017A010103025"]}],"id":[{"id":"10.13039\/501100007162","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Zhanjiang science and technology plan project","award":["2017A03021"],"award-info":[{"award-number":["2017A03021"]}]},{"name":"Special talents project of Lingnan Normal University","award":["ZL1617"],"award-info":[{"award-number":["ZL1617"]}]},{"name":"Major projects in guangdong province for basic and applied research of natural science","award":["2017"],"award-info":[{"award-number":["2017"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Fiber-optic surface plasmon resonance (SPR) sensors possess the advantages of small size, flexible, allowing for a smaller sample volume, easy to be integrated, and high sensitivity. They have been intensively developed in recent decades. However, the polarizing nature of the surface plasmon waves (SPWs) always hinders the acquisition of SPR spectrum with high signal-noise ratio in wavelength modulation unless a polarizer is employed. The addition of polarizer complicates the system and reduces the degree of compactness. In this work, we propose and demonstrate a novel, polarization-independent fiber-optic SPR sensor based on a BK7 bi-prism with two incident planes orthogonal to each other. In the bi-prism, TM-polarized components of non-polarized incident lights excite SPWs on the first sensing channel, meanwhile the TE components and the remaining TM components are reflected, then the reflected TE components serve as TM components of incident lights for the second sensing channel to excite SPWs. Simulations show the proposed SPR structure permit us to completely eliminate the polarization dependence of the plasmon excitation. Experimental results agree well with the simulations. This kind of devices can be considered an excellent option for development of simple and compact SPR chemical sensors.<\/jats:p>","DOI":"10.3390\/s18103204","type":"journal-article","created":{"date-parts":[[2018,9,24]],"date-time":"2018-09-24T10:38:49Z","timestamp":1537785529000},"page":"3204","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":16,"title":["A Polarization-Independent Fiber-Optic SPR Sensor"],"prefix":"10.3390","volume":"18","author":[{"given":"Songquan","family":"Li","sequence":"first","affiliation":[{"name":"College of physical Science &amp; Technology, Lingnan Normal University, Zhanjiang 524048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Laixu","family":"Gao","sequence":"additional","affiliation":[{"name":"College of physical Science &amp; Technology, Lingnan Normal University, Zhanjiang 524048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Changwei","family":"Zou","sequence":"additional","affiliation":[{"name":"College of physical Science &amp; Technology, Lingnan Normal University, Zhanjiang 524048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Wei","family":"Xie","sequence":"additional","affiliation":[{"name":"College of physical Science &amp; Technology, Lingnan Normal University, Zhanjiang 524048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yong","family":"Wei","sequence":"additional","affiliation":[{"name":"College of Electronic &amp; Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Canxin","family":"Tian","sequence":"additional","affiliation":[{"name":"College of physical Science &amp; Technology, Lingnan Normal University, Zhanjiang 524048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Zesong","family":"Wang","sequence":"additional","affiliation":[{"name":"College of physical Science &amp; Technology, Lingnan Normal University, Zhanjiang 524048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Feng","family":"Liang","sequence":"additional","affiliation":[{"name":"College of physical Science &amp; Technology, Lingnan Normal University, Zhanjiang 524048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yanxiong","family":"Xiang","sequence":"additional","affiliation":[{"name":"College of physical Science &amp; Technology, Lingnan Normal University, Zhanjiang 524048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Qian","family":"Yang","sequence":"additional","affiliation":[{"name":"College of physical Science &amp; Technology, Lingnan Normal University, Zhanjiang 524048, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2018,9,22]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Klantsataya, E., Jia, P., Ebendorff-Heidepriem, H., Monro, T.M., and Fran\u00e7ois, A. (2017). Plasmonic Fiber Optic Refractometric Sensors: From Conventional Architectures to Recent Design Trends. Sensors, 17.","DOI":"10.3390\/s17010012"},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"21841","DOI":"10.1364\/OE.25.021841","article-title":"Segmented detection SPR sensor based on seven-core fiber","volume":"25","author":"Wei","year":"2017","journal-title":"Opt. Express"},{"key":"ref_3","doi-asserted-by":"crossref","first-page":"24004","DOI":"10.1364\/OE.23.024004","article-title":"Compact distributed fiber SPR sensor based on TDM and WDM technology","volume":"23","author":"Liu","year":"2015","journal-title":"Opt. Express"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"2218","DOI":"10.1364\/OL.30.002218","article-title":"Tapered fiber optic surface plasmon resonance sensor for analyses of vapor and liquid phases","volume":"30","author":"Kim","year":"2005","journal-title":"Opt. Lett."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"206","DOI":"10.1016\/j.snb.2016.02.020","article-title":"Surface plasmon resonance refractive sensor based on silver-coated side-polished fiber","volume":"230","author":"Zhao","year":"2016","journal-title":"Sens. Actuators B Chem."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"26","DOI":"10.1016\/j.snb.2008.01.003","article-title":"Effects of gold film thickness on spectrum profile and sensitivity of a multimode-optical-fiber SPR sensor","volume":"132","author":"Suzuki","year":"2008","journal-title":"Sens. Actuators B Chem."},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"2988","DOI":"10.1364\/OL.30.002988","article-title":"Investigation of dual-channel fiber-optic surface plasmon resonance sensing for biological applications","volume":"30","author":"Peng","year":"2005","journal-title":"Opt. Lett."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"195","DOI":"10.1016\/j.snb.2010.02.036","article-title":"Refractive index sensing of aqueous media based on plasmonic resonance in tapered optical fibres operating in the 1.5 \u03bcm region","volume":"146","author":"Viegas","year":"2010","journal-title":"Sens. Actuators B Chem."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"7","DOI":"10.1007\/s11468-009-9108-0","article-title":"A polarization-independent SPR fiber sensor","volume":"5","author":"Navarrete","year":"2010","journal-title":"Plasmonics"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"161","DOI":"10.1016\/S0925-4005(97)00290-6","article-title":"A surface plasmon resonance sensor probe based on retro-reflection","volume":"45","author":"Cahill","year":"1997","journal-title":"Sens. Actuators B Chem."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"236","DOI":"10.1016\/S0925-4005(00)00690-0","article-title":"A surface plasmon resonance side active retro-reflecting sensor","volume":"73","author":"Jorgenson","year":"2001","journal-title":"Sens. Actuators B Chem"},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"258","DOI":"10.1016\/j.snb.2017.02.064","article-title":"A compact, flexible fiber-optic Surface Plasmon Resonance sensor with changeable sensor chips","volume":"246","author":"Michel","year":"2017","journal-title":"Sens. Actuators B Chem."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"4370","DOI":"10.1103\/PhysRevB.6.4370","article-title":"Optical constants of the noble metals","volume":"6","author":"Johnson","year":"1972","journal-title":"Phys. Rev. B"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Hjelme, D.R. (2017, January 24\u201327). A lower bound on the resolution limit of resonant refractive index sensors. Proceedings of the Advanced Photonics 2017 (IPR, NOMA, Sensors, Networks, SPPCom, PS), New Orleans, LA, USA.","DOI":"10.1364\/SENSORS.2017.SeM2E.2"}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/10\/3204\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T15:22:00Z","timestamp":1760196120000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/18\/10\/3204"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2018,9,22]]},"references-count":14,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2018,10]]}},"alternative-id":["s18103204"],"URL":"https:\/\/doi.org\/10.3390\/s18103204","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2018,9,22]]}}}