Broadband metamaterial polarizers with high extinction ratio for high-precision terahertz spectroscopic polarimetry
The demand for precise polarizers is increasing to investigate the polarization characteristics of materials non-invasively in the terahertz region. Recently, to address the low extinction ratio and fragile nature of conventional wire-grid polarizers, plasmonic structures and metasurfaces have been...
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| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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AIP Publishing LLC
2024-11-01
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| Series: | APL Photonics |
| Online Access: | http://dx.doi.org/10.1063/5.0228119 |
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| author | H. Park H. Park J. Lee J. Shim H. Son J. Park S. Baek T.-T. Kim |
| author_facet | H. Park H. Park J. Lee J. Shim H. Son J. Park S. Baek T.-T. Kim |
| author_sort | H. Park |
| collection | DOAJ |
| description | The demand for precise polarizers is increasing to investigate the polarization characteristics of materials non-invasively in the terahertz region. Recently, to address the low extinction ratio and fragile nature of conventional wire-grid polarizers, plasmonic structures and metasurfaces have been proposed. However, the challenge of achieving low transmittance compared to a high extinction ratio, along with the bulky structure due to a thick substrate, remains to be addressed. Here, we present high-efficiency broadband metamaterial polarizers consisting of cross-aligned double-layers of subwavelength metallic slit arrays, leveraging the extraordinary optical transmission and funneling effects. We obtained extinction ratios exceeding 70 dB over a broad frequency range, from 0.2 to 2.5 THz, reaching a maximum extinction ratio of ∼90 dB at 0.7 THz. To investigate the influence of high extinction ratio polarizers on actual measurement results, we measured a non-Hermitian metasurface with asymmetric polarization conversion and analyzed them using the Jones matrix formalism. The results confirmed that the extinction ratio of the polarizer has a significant impact on precise polarization-dependent measurements, especially on cross-polarization measurements. The enhanced performance of our polarizers offers significant potential for sensitive THz systems, paving the way for advancements in polarization analysis of emerging materials and chiral sensing. |
| format | Article |
| id | doaj-art-be26319080e24def99631a5703a88c8d |
| institution | OA Journals |
| issn | 2378-0967 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | AIP Publishing LLC |
| record_format | Article |
| series | APL Photonics |
| spelling | doaj-art-be26319080e24def99631a5703a88c8d2025-08-20T02:35:54ZengAIP Publishing LLCAPL Photonics2378-09672024-11-01911110807110807-910.1063/5.0228119Broadband metamaterial polarizers with high extinction ratio for high-precision terahertz spectroscopic polarimetryH. Park0H. Park1J. Lee2J. Shim3H. Son4J. Park5S. Baek6T.-T. Kim7Department of Physics, University of Ulsan, Ulsan 44610, Republic of KoreaDepartment of Physics, University of Ulsan, Ulsan 44610, Republic of KoreaDepartment of Physics, University of Ulsan, Ulsan 44610, Republic of KoreaDepartment of Physics, University of Ulsan, Ulsan 44610, Republic of KoreaDepartment of Physics, University of Ulsan, Ulsan 44610, Republic of KoreaDepartment of Electrical Engineering and Computer Sciences, University of California, Berkeley, California 94720, USADepartment of Electrical and Computer Engineering, University of California, San Diego, California 92093, USADepartment of Physics, University of Ulsan, Ulsan 44610, Republic of KoreaThe demand for precise polarizers is increasing to investigate the polarization characteristics of materials non-invasively in the terahertz region. Recently, to address the low extinction ratio and fragile nature of conventional wire-grid polarizers, plasmonic structures and metasurfaces have been proposed. However, the challenge of achieving low transmittance compared to a high extinction ratio, along with the bulky structure due to a thick substrate, remains to be addressed. Here, we present high-efficiency broadband metamaterial polarizers consisting of cross-aligned double-layers of subwavelength metallic slit arrays, leveraging the extraordinary optical transmission and funneling effects. We obtained extinction ratios exceeding 70 dB over a broad frequency range, from 0.2 to 2.5 THz, reaching a maximum extinction ratio of ∼90 dB at 0.7 THz. To investigate the influence of high extinction ratio polarizers on actual measurement results, we measured a non-Hermitian metasurface with asymmetric polarization conversion and analyzed them using the Jones matrix formalism. The results confirmed that the extinction ratio of the polarizer has a significant impact on precise polarization-dependent measurements, especially on cross-polarization measurements. The enhanced performance of our polarizers offers significant potential for sensitive THz systems, paving the way for advancements in polarization analysis of emerging materials and chiral sensing.http://dx.doi.org/10.1063/5.0228119 |
| spellingShingle | H. Park H. Park J. Lee J. Shim H. Son J. Park S. Baek T.-T. Kim Broadband metamaterial polarizers with high extinction ratio for high-precision terahertz spectroscopic polarimetry APL Photonics |
| title | Broadband metamaterial polarizers with high extinction ratio for high-precision terahertz spectroscopic polarimetry |
| title_full | Broadband metamaterial polarizers with high extinction ratio for high-precision terahertz spectroscopic polarimetry |
| title_fullStr | Broadband metamaterial polarizers with high extinction ratio for high-precision terahertz spectroscopic polarimetry |
| title_full_unstemmed | Broadband metamaterial polarizers with high extinction ratio for high-precision terahertz spectroscopic polarimetry |
| title_short | Broadband metamaterial polarizers with high extinction ratio for high-precision terahertz spectroscopic polarimetry |
| title_sort | broadband metamaterial polarizers with high extinction ratio for high precision terahertz spectroscopic polarimetry |
| url | http://dx.doi.org/10.1063/5.0228119 |
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