{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,5,20]],"date-time":"2026-05-20T23:13:43Z","timestamp":1779318823101,"version":"3.51.4"},"reference-count":48,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2021,1,7]],"date-time":"2021-01-07T00:00:00Z","timestamp":1609977600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100002674","name":"Russian Academy of Sciences","doi-asserted-by":"publisher","award":["No. 007-GZ\/Ch3363\/26"],"award-info":[{"award-number":["No. 007-GZ\/Ch3363\/26"]}],"id":[{"id":"10.13039\/501100002674","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100006769","name":"Russian Science Foundation","doi-asserted-by":"publisher","award":["No. 20-69-47110"],"award-info":[{"award-number":["No. 20-69-47110"]}],"id":[{"id":"10.13039\/501100006769","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>In this paper, we have numerically investigated a metasurface based perfect absorber design, established on the impedance matching phenomena. The paper comprises of two parts. In the first part, the device performance of the perfect absorber\u2014which is composed of silicon nano-cylindrical meta-atoms, periodically arranged on a thin gold layer\u2014is studied. The device design is unique and works for both x-oriented and y-oriented polarized light, in addition to being independent of the angle of incidence. In the second part of the paper, a CO2 gas sensing application is explored by depositing a thin layer of functional host material\u2014a polyhexamethylene biguanide polymer\u2014on the metasurface. The refractive index of the host material decreases due to the absorption of the CO2 gas. As a result, the resonance wavelength of the perfect absorber performs a prominent blueshift. With the help of the proposed sensor design, based on metasurface, the CO2 gas concentration range of 0\u2013524 ppm was detected. A maximum sensitivity of 17.3 pm\/ppm was acquired for a gas concentration of 434 ppm. The study presented in this work explores the opportunity of utilizing the metasurface perfect absorber for gas sensing applications by employing functional host materials.<\/jats:p>","DOI":"10.3390\/s21020378","type":"journal-article","created":{"date-parts":[[2021,1,10]],"date-time":"2021-01-10T23:03:42Z","timestamp":1610319822000},"page":"378","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":86,"title":["Carbon Dioxide Gas Sensor Based on Polyhexamethylene Biguanide Polymer Deposited on Silicon Nano-Cylinders Metasurface"],"prefix":"10.3390","volume":"21","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-0180-7522","authenticated-orcid":false,"given":"Nikolay Lvovich","family":"Kazanskiy","sequence":"first","affiliation":[{"name":"Samara National Research University, 443086 Samara, Russia"},{"name":"Institute of RAS-Branch of the FSRC Crystallography and Photonics RAS, 443086 Samara, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-0829-4886","authenticated-orcid":false,"given":"Muhammad Ali","family":"Butt","sequence":"additional","affiliation":[{"name":"Samara National Research University, 443086 Samara, Russia"},{"name":"Institute of Microelectronics and Optoelectronics, Warsaw University of Technology, 00-662 Warsaw, Poland"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6765-4373","authenticated-orcid":false,"given":"Svetlana Nikolaevna","family":"Khonina","sequence":"additional","affiliation":[{"name":"Samara National Research University, 443086 Samara, Russia"},{"name":"Institute of RAS-Branch of the FSRC Crystallography and Photonics RAS, 443086 Samara, Russia"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,1,7]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"503002","DOI":"10.1088\/1361-6463\/aa94a8","article-title":"Theory of metasurface based perfect absorbers","volume":"50","author":"Alaee","year":"2017","journal-title":"J. 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