{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,1,16]],"date-time":"2026-01-16T11:59:26Z","timestamp":1768564766057,"version":"3.49.0"},"reference-count":50,"publisher":"MDPI AG","issue":"18","license":[{"start":{"date-parts":[[2020,9,20]],"date-time":"2020-09-20T00:00:00Z","timestamp":1600560000000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100003706","name":"Korea Research Institute of Standards and Science","doi-asserted-by":"publisher","award":["KRISS-2020-GP2020-0011"],"award-info":[{"award-number":["KRISS-2020-GP2020-0011"]}],"id":[{"id":"10.13039\/501100003706","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003725","name":"National Research Foundation of Korea","doi-asserted-by":"publisher","award":["2018069993"],"award-info":[{"award-number":["2018069993"]}],"id":[{"id":"10.13039\/501100003725","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Asian Office of Aerospace Research and Development","award":["FA2386-18-1-4021"],"award-info":[{"award-number":["FA2386-18-1-4021"]}]},{"DOI":"10.13039\/100000181","name":"Air Force Office of Scientific Research","doi-asserted-by":"publisher","award":["FA2386-243 18-1-4104"],"award-info":[{"award-number":["FA2386-243 18-1-4104"]}],"id":[{"id":"10.13039\/100000181","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Infrared (IR) polarimetric imaging has attracted attention as a promising technology in many fields. Generally, superpixels consisting of linear polarizer elements at different angles plus IR imaging array are used to obtain the polarized target signature by using the detected polarization-sensitive intensities. However, the spatial arrangement of superpixels across the imaging array may lead to an incorrect polarimetric signature of a target, due to the range of angles from which the incident radiation can be collected by the detector. In this article, we demonstrate the effect of the incident angle on the polarization performance of an alternative structure where a dielectric layer is inserted between the nanoimprinted subwavelength grating layers. The well-designed spacer creates the Fabry\u2013Perot cavity resonance, and thereby, the intensity of transverse-magnetic I-polarized light transmitted through two metal grating layers is increased as compared with a single-layer metal grating, whereas transverse-electric (TE)-transmitted light intensity is decreased. TM-transmittance and polarization extinction ratio (PER) of normally incident light of wavelength 4.5 \u03bcm are obtained with 0.49 and 132, respectively, as the performance of the stacked subwavelength gratings. The relative change of the PERs for nanoimprint-lithographically fabricated double-layer grating samples that are less than 6% at an angle of incidence up to 25\u00b0, as compared to the normal incidence. Our work can pave the way for practical and efficient polarization-sensitive elements, which are useful for many IR polarimetric imaging applications.<\/jats:p>","DOI":"10.3390\/s20185382","type":"journal-article","created":{"date-parts":[[2020,9,20]],"date-time":"2020-09-20T21:20:28Z","timestamp":1600636828000},"page":"5382","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":3,"title":["Polarization-Sensitive and Wide Incidence Angle-Insensitive Fabry\u2013Perot Optical Cavity Bounded by Two Metal Grating Layers"],"prefix":"10.3390","volume":"20","author":[{"given":"Jehwan","family":"Hwang","sequence":"first","affiliation":[{"name":"Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science, Daejeon 34113, Korea"},{"name":"Department of Physics and Research Institute for Convergence of Basic Sciences, Hanyang University, Seoul 04763, Korea"}]},{"given":"Zahyun","family":"Ku","sequence":"additional","affiliation":[{"name":"Materials and Manufacturing Directorate, Air Force Research Laboratory, WPAFB, OH 45433, USA"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-8287-5473","authenticated-orcid":false,"given":"Jiyeon","family":"Jeon","sequence":"additional","affiliation":[{"name":"Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science, Daejeon 34113, Korea"},{"name":"Department of Electronic Engineering, Sejong University, Seoul 05006, Korea"}]},{"given":"Yeongho","family":"Kim","sequence":"additional","affiliation":[{"name":"Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science, Daejeon 34113, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2515-4984","authenticated-orcid":false,"given":"Deok-Kee","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Electronic Engineering, Sejong University, Seoul 05006, Korea"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-3373-963X","authenticated-orcid":false,"given":"Eun Kyu","family":"Kim","sequence":"additional","affiliation":[{"name":"Department of Physics and Research Institute for Convergence of Basic Sciences, Hanyang University, Seoul 04763, Korea"}]},{"given":"Sang Jun","family":"Lee","sequence":"additional","affiliation":[{"name":"Interdisciplinary Materials Measurement Institute, Korea Research Institute of Standards and Science, Daejeon 34113, Korea"}]}],"member":"1968","published-online":{"date-parts":[[2020,9,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"5453","DOI":"10.1364\/AO.45.005453","article-title":"Review of passive imaging polarimetry for remote sensing applications","volume":"45","author":"Tyo","year":"2006","journal-title":"Appl. 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