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Graphene coated on the micro-grooves in the cladding was used as plasma material to introduce tunability. The dispersion relation, mode coupling, and sensing characteristics of the fiber were studied using the finite element method. Ultrahigh sensitivity of 2.014 THz\/RIU and 0.734 GHz\/\u00b0C were obtained for analytes with refractive index in the range of 1.33 to 1.4 and environment temperature in the range of 10\u201360 \u00b0C, respectively. Refractive index resolution can reach the order of 10\u22125. The dual parameter simultaneous detection, dynamic tunable characteristics, and working in the low-frequency range of terahertz enable the designed photonic crystal fiber to have application prospects in the field of biosensing.<\/jats:p>","DOI":"10.3390\/s24196225","type":"journal-article","created":{"date-parts":[[2024,9,26]],"date-time":"2024-09-26T08:20:52Z","timestamp":1727338852000},"page":"6225","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":9,"title":["Terahertz Refractive Index and Temperature Dual-Parameter Sensor Based on Surface Plasmon Resonance in Two-Channel Photonic Crystal Fiber"],"prefix":"10.3390","volume":"24","author":[{"given":"Doudou","family":"Wang","sequence":"first","affiliation":[{"name":"College of Sciences, Xi\u2019an University of Science and Technology, Xi\u2019an 710054, China"}]},{"ORCID":"https:\/\/orcid.org\/0009-0007-6475-5276","authenticated-orcid":false,"given":"Wenchuan","family":"Guo","sequence":"additional","affiliation":[{"name":"College of Sciences, Xi\u2019an University of Science and Technology, Xi\u2019an 710054, China"}]},{"given":"Yizu","family":"Zou","sequence":"additional","affiliation":[{"name":"College of Sciences, Xi\u2019an University of Science and Technology, Xi\u2019an 710054, China"}]},{"given":"Tian","family":"Ma","sequence":"additional","affiliation":[{"name":"College of Safety Science and Engineering, Xi\u2019an University of Science and Technology, Xi\u2019an 710054, China"}]},{"given":"Weifeng","family":"Wang","sequence":"additional","affiliation":[{"name":"College of Safety Science and Engineering, Xi\u2019an University of Science and Technology, Xi\u2019an 710054, China"}]},{"given":"Guoxiang","family":"Chen","sequence":"additional","affiliation":[{"name":"College of Sciences, Xi\u2019an Shiyou University, Xi\u2019an 710065, China"}]}],"member":"1968","published-online":{"date-parts":[[2024,9,26]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"528","DOI":"10.1007\/s00216-003-2101-0","article-title":"Present and future of surface plasmon resonance biosensors","volume":"377","author":"Homola","year":"2003","journal-title":"Anal. 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