{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,4,9]],"date-time":"2026-04-09T06:05:58Z","timestamp":1775714758224,"version":"3.50.1"},"reference-count":40,"publisher":"MDPI AG","issue":"10","license":[{"start":{"date-parts":[[2023,5,9]],"date-time":"2023-05-09T00:00:00Z","timestamp":1683590400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100004504","name":"Research Council of Lithuania (LMTLT)","doi-asserted-by":"publisher","award":["S-MIP-22-76"],"award-info":[{"award-number":["S-MIP-22-76"]}],"id":[{"id":"10.13039\/501100004504","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>We report on the experimental evidence of thermal terahertz (THz) emission tailored by magnetic polariton (MP) excitations in entirely GaAs-based structures equipped with metasurfaces. The n-GaAs\/GaAs\/TiAu structure was optimized using finite-difference time-domain (FDTD) simulations for the resonant MP excitations in the frequency range below 2 THz. Molecular beam epitaxy was used to grow the GaAs layer on the n-GaAs substrate, and a metasurface, comprising periodic TiAu squares, was formed on the top surface using UV laser lithography. The structures exhibited resonant reflectivity dips at room temperature and emissivity peaks at T=390 \u00b0C in the range from 0.7 THz to 1.3 THz, depending on the size of the square metacells. In addition, the excitations of the third harmonic were observed. The bandwidth was measured as narrow as 0.19 THz of the resonant emission line at 0.71 THz for a 42 \u03bcm metacell side length. An equivalent LC circuit model was used to describe the spectral positions of MP resonances analytically. Good agreement was achieved among the results of simulations, room temperature reflection measurements, thermal emission experiments, and equivalent LC circuit model calculations. Thermal emitters are mostly produced using a metal-insulator-metal (MIM) stack, whereas our proposed employment of n-GaAs substrate instead of metal film allows us to integrate the emitter with other GaAs optoelectronic devices. The MP resonance quality factors obtained at elevated temperatures (Q\u22483.3to5.2) are very similar to those of MIM structures as well as to 2D plasmon resonance quality at cryogenic temperatures.<\/jats:p>","DOI":"10.3390\/s23104600","type":"journal-article","created":{"date-parts":[[2023,5,10]],"date-time":"2023-05-10T01:57:51Z","timestamp":1683683871000},"page":"4600","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":6,"title":["Narrowband Thermal Terahertz Emission from Homoepitaxial GaAs Structures Coupled with Ti\/Au Metasurface"],"prefix":"10.3390","volume":"23","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8383-3427","authenticated-orcid":false,"given":"Ignas","family":"Grigelionis","sequence":"first","affiliation":[{"name":"Center for Physical Sciences and Technology, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-1781-4660","authenticated-orcid":false,"given":"Vladislovas","family":"\u010ci\u017eas","sequence":"additional","affiliation":[{"name":"Center for Physical Sciences and Technology, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3629-4798","authenticated-orcid":false,"given":"Mindaugas","family":"Karali\u016bnas","sequence":"additional","affiliation":[{"name":"Center for Physical Sciences and Technology, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9468-8691","authenticated-orcid":false,"given":"Vytautas","family":"Jak\u0161tas","sequence":"additional","affiliation":[{"name":"Center for Physical Sciences and Technology, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2165-3866","authenticated-orcid":false,"given":"K\u0229stutis","family":"Ikamas","sequence":"additional","affiliation":[{"name":"Center for Physical Sciences and Technology, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"},{"name":"Institute of Applied Electrodynamics and Telecommunications, Vilnius University, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-2769-452X","authenticated-orcid":false,"given":"Andrzej","family":"Urbanowicz","sequence":"additional","affiliation":[{"name":"Center for Physical Sciences and Technology, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5050-0615","authenticated-orcid":false,"given":"Marius","family":"Treideris","sequence":"additional","affiliation":[{"name":"Center for Physical Sciences and Technology, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-9456-9027","authenticated-orcid":false,"given":"Andrius","family":"Bi\u010di\u016bnas","sequence":"additional","affiliation":[{"name":"Center for Physical Sciences and Technology, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-5373-373X","authenticated-orcid":false,"given":"Domas","family":"Jokubauskis","sequence":"additional","affiliation":[{"name":"Center for Physical Sciences and Technology, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-1682-056X","authenticated-orcid":false,"given":"Renata","family":"Butkut\u0117","sequence":"additional","affiliation":[{"name":"Center for Physical Sciences and Technology, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"},{"name":"Institute of Photonics and Nanotechnology, Vilnius University, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-3831-8976","authenticated-orcid":false,"given":"Linas","family":"Minkevi\u010dius","sequence":"additional","affiliation":[{"name":"Center for Physical Sciences and Technology, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"},{"name":"Institute of Photonics and Nanotechnology, Vilnius University, Saul\u0117tekio Ave. 3, 10257 Vilnius, Lithuania"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2023,5,9]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"26","DOI":"10.1038\/nmat708","article-title":"Materials for terahertz science and technology","volume":"1","author":"Ferguson","year":"2002","journal-title":"Nat. Mater."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"9417","DOI":"10.1364\/OE.26.009417","article-title":"Twenty years of terahertz imaging","volume":"26","author":"Mittleman","year":"2018","journal-title":"Opt. Express"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Valu\u0161is, G., Lisauskas, A., Yuan, H., Knap, W., and Roskos, H.G. (2021). Roadmap of Terahertz Imaging 2021. Sensors, 21.","DOI":"10.3390\/s21124092"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"124","DOI":"10.1002\/lpor.201000011","article-title":"Terahertz spectroscopy and imaging\u2014Modern techniques and applications","volume":"5","author":"Jepsen","year":"2011","journal-title":"Laser Photonics Rev."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"19235","DOI":"10.1364\/OE.22.019235","article-title":"Antenna-coupled field-effect transistors for multi-spectral terahertz imaging up to 4.25 THz","volume":"22","author":"Bauer","year":"2014","journal-title":"Opt. Express"},{"key":"ref_6","doi-asserted-by":"crossref","unstructured":"Ka\u0161alynas, I., Venckevi\u010dius, R., Minkevi\u010dius, L., Se\u0161ek, A., Wahaia, F., Tamo\u0161i\u016bnas, V., Voisiat, B., Seliuta, D., Valu\u0161is, G., and \u0160vigelj, A. (2016). Spectroscopic Terahertz Imaging at Room Temperature Employing Microbolometer Terahertz Sensors and Its Application to the Study of Carcinoma Tissues. Sensors, 16.","DOI":"10.3390\/s16040432"},{"key":"ref_7","doi-asserted-by":"crossref","unstructured":"Tamo\u0161i\u016bnas, V., Minkevi\u010dius, L., Bu\u010dius, I., Jokubauskis, D., Redeckas, K., and Valu\u0161is, G. (2022). Design and Performance of Extraordinary Low-Cost Compact Terahertz Imaging System Based on Electronic Components and Paraffin Wax Optics. Sensors, 22.","DOI":"10.3390\/s22218485"},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"477","DOI":"10.1007\/s10762-019-00581-5","article-title":"Terahertz Diffractive Optics\u2014Smart Control over Radiation","volume":"40","author":"Siemion","year":"2019","journal-title":"J. Infrared Millim. Terahertz Waves"},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"689","DOI":"10.1007\/s10762-017-0382-1","article-title":"Influence of Field Effects on the Performance of InGaAs-Based Terahertz Radiation Detectors","volume":"38","author":"Kojelis","year":"2017","journal-title":"J. Infrared Millim. Terahertz Waves"},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"326","DOI":"10.1038\/s41377-022-01007-z","article-title":"Terahertz structured light: Nonparaxial Airy imaging using silicon diffractive optics","volume":"11","author":"Nacius","year":"2022","journal-title":"Light Sci. Appl."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"2795","DOI":"10.1364\/OL.43.002795","article-title":"Fibonacci terahertz imaging by silicon diffractive optics","volume":"43","author":"Jokubauskis","year":"2018","journal-title":"Opt. Lett."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"18730","DOI":"10.1364\/OE.456801","article-title":"Terahertz Fresnel-zone-plate thin-film lens based on a high-transmittance double-layer metamaterial phase shifter","volume":"30","author":"Han","year":"2022","journal-title":"Opt. Express"},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"3281","DOI":"10.1109\/JSSC.2020.3018819","article-title":"A 64-Pixel 0.42-THz Source SoC with Spatial Modulation Diversity for Computational Imaging","volume":"55","author":"Jain","year":"2020","journal-title":"IEEE J. Solid-State Circuits"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Asada, M., and Suzuki, S. (2021). Terahertz Emitter Using Resonant-Tunneling Diode and Applications. Sensors, 21.","DOI":"10.3390\/s21041384"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"374001","DOI":"10.1088\/0022-3727\/47\/37\/374001","article-title":"A review of terahertz sources","volume":"47","author":"Lewis","year":"2014","journal-title":"J. Phys. D Appl. Phys."},{"key":"ref_16","doi-asserted-by":"crossref","unstructured":"Ikamas, K., But, D.B., Cesiul, A., Ko\u0142aci\u0144ski, C., Lisauskas, T., Knap, W., and Lisauskas, A. (2021). All-Electronic Emitter-Detector Pairs for 250 GHz in Silicon. Sensors, 21.","DOI":"10.3390\/s21175795"},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"118","DOI":"10.1515\/FREQ.2008.62.5-6.118","article-title":"Terahertz Sources Based on Frequency Multiplication and Their Applications","volume":"62","author":"Maestrini","year":"2008","journal-title":"Frequenz"},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1243","DOI":"10.1515\/nanoph-2020-0563","article-title":"THz spintronic emitters: A review on achievements and future challenges","volume":"10","author":"Papaioannou","year":"2021","journal-title":"Nanophotonics"},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2106172","DOI":"10.1002\/adma.202106172","article-title":"Generation and Control of Terahertz Spin Currents in Topology-Induced 2D Ferromagnetic Fe3GeTe2|Bi2Te3 Heterostructures","volume":"34","author":"Chen","year":"2022","journal-title":"Adv. Mater."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"201110","DOI":"10.1063\/1.4967998","article-title":"Plasmonic terahertz modulator based on a grating-coupled two-dimensional electron system","volume":"109","author":"Huang","year":"2016","journal-title":"Appl. Phys. Lett."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"2326","DOI":"10.1063\/1.114333","article-title":"Far-infrared emission spectroscopy of hot two-dimensional plasmons in Al0.3Ga0.7As\/GaAs heterojunctions","volume":"67","author":"Hirakawa","year":"1995","journal-title":"Appl. Phys. Lett."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"183104","DOI":"10.1063\/1.5118771","article-title":"Selective terahertz emission due to electrically excited 2D plasmons in AlGaN\/GaN heterostructure","volume":"126","author":"Shalygin","year":"2019","journal-title":"J. Appl. Phys."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"014001","DOI":"10.1117\/1.AP.2.1.014001","article-title":"Terahertz surface plasmonic waves: A review","volume":"2","author":"Zhang","year":"2020","journal-title":"Adv. Photonics"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"21025","DOI":"10.1364\/OE.20.021025","article-title":"Narrowband terahertz emitters using metamaterial films","volume":"20","author":"Alves","year":"2012","journal-title":"Opt. Express"},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"233102","DOI":"10.1063\/1.2938716","article-title":"Narrow-band, tunable infrared emission from arrays of microstrip patches","volume":"92","author":"Puscasu","year":"2008","journal-title":"Appl. Phys. Lett."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"2550","DOI":"10.1021\/acsphotonics.7b00838","article-title":"Midinfrared Ultrastrong Light\u2013Matter Coupling for THz Thermal Emission","volume":"4","author":"Askenazi","year":"2017","journal-title":"ACS Photonics"},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"123004","DOI":"10.1088\/1367-2630\/18\/12\/123004","article-title":"High performance 4.7 THz GaAs quantum cascade lasers based on four quantum wells","volume":"18","author":"Ohtani","year":"2016","journal-title":"New J. Phys."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"115015","DOI":"10.1088\/0268-1242\/27\/11\/115015","article-title":"THz excitation spectra of AIIIBV semiconductors","volume":"27","author":"Arlauskas","year":"2012","journal-title":"Semicond. Sci. Technol."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"162101","DOI":"10.1063\/5.0022600","article-title":"Experimental evidence of temperature dependent effective mass in AlGaN\/GaN heterostructures observed via THz spectroscopy of 2D plasmons","volume":"117","author":"Pashnev","year":"2020","journal-title":"Appl. Phys. Lett."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1873","DOI":"10.1364\/OL.30.001873","article-title":"Planar heterogeneous structures for coherent emission of radiation","volume":"30","author":"Fu","year":"2005","journal-title":"Opt. Lett."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"16651","DOI":"10.1364\/OE.15.016651","article-title":"Dependence of the magnetic-resonance frequency on the cut-wire width of cut-wire pair medium","volume":"15","author":"Lam","year":"2007","journal-title":"Opt. Express"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"11328","DOI":"10.1364\/OE.16.011328","article-title":"Coherent thermal emission by excitation of magnetic polaritons between periodic strips and a metallic film","volume":"16","author":"Lee","year":"2008","journal-title":"Opt. Express"},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"251112","DOI":"10.1063\/1.2750394","article-title":"Exploring magnetic plasmon polaritons in optical transmission through hole arrays perforated in trilayer structures","volume":"90","author":"Li","year":"2007","journal-title":"Appl. Phys. Lett."},{"key":"ref_34","doi-asserted-by":"crossref","first-page":"023104","DOI":"10.1063\/1.2828178","article-title":"Dispersion of magnetic plasmon polaritons in perforated trilayer metamaterials","volume":"103","author":"Li","year":"2008","journal-title":"J. Appl. Phys."},{"key":"ref_35","doi-asserted-by":"crossref","first-page":"106788","DOI":"10.1016\/j.jqsrt.2019.106788","article-title":"Tailoring radiative properties with magnetic polaritons in deep gratings and slit arrays based on structural transformation","volume":"242","author":"Guo","year":"2020","journal-title":"J. Quant. Spectrosc. Radiat. Transf."},{"key":"ref_36","doi-asserted-by":"crossref","first-page":"2350","DOI":"10.1021\/acsphotonics.0c00768","article-title":"Inverse design of lightweight broadband reflector for relativistic lightsail propulsion","volume":"7","author":"Jin","year":"2020","journal-title":"ACS Photonics"},{"key":"ref_37","doi-asserted-by":"crossref","first-page":"3261","DOI":"10.1063\/1.349285","article-title":"Temperature dependence of optical properties of GaAs","volume":"70","author":"Yao","year":"1991","journal-title":"J. Appl. Phys."},{"key":"ref_38","doi-asserted-by":"crossref","first-page":"3620","DOI":"10.1364\/OL.31.003620","article-title":"Unifying approach to left-handed material design","volume":"31","author":"Zhou","year":"2006","journal-title":"Opt. Lett."},{"key":"ref_39","doi-asserted-by":"crossref","first-page":"121114","DOI":"10.1063\/1.5041977","article-title":"Highly efficient power extraction in terahertz quantum cascade laser via a grating coupler","volume":"113","author":"Yu","year":"2018","journal-title":"Appl. Phys. Lett."},{"key":"ref_40","doi-asserted-by":"crossref","first-page":"243509","DOI":"10.1063\/1.4884602","article-title":"Operation of resonant-tunneling diodes with strong back injection from the collector at frequencies up to 1.46 THz","volume":"104","author":"Feiginov","year":"2014","journal-title":"Appl. Phys. Lett."}],"container-title":["Sensors"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/1424-8220\/23\/10\/4600\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T19:32:15Z","timestamp":1760124735000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/1424-8220\/23\/10\/4600"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2023,5,9]]},"references-count":40,"journal-issue":{"issue":"10","published-online":{"date-parts":[[2023,5]]}},"alternative-id":["s23104600"],"URL":"https:\/\/doi.org\/10.3390\/s23104600","relation":{},"ISSN":["1424-8220"],"issn-type":[{"value":"1424-8220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2023,5,9]]}}}