Terahertz Circular Dichroism Spectroscopy of 3D Chiral Metallic Microstructures Fabricated Using High Precision CNC Machining
Recent advancements in terahertz wave applications for sensing, imaging, and high-speed communication have spurred a substantial demand for low-cost, easily accessible optical components capable of manipulating terahertz wave polarization. In this study, terahertz circular dichroism spectroscopic me...
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IEEE
2025-01-01
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| Series: | IEEE Journal of Microwaves |
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| Online Access: | https://ieeexplore.ieee.org/document/10815599/ |
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| author | Atsushi Ouchi Saroj R. Tripathi |
| author_facet | Atsushi Ouchi Saroj R. Tripathi |
| author_sort | Atsushi Ouchi |
| collection | DOAJ |
| description | Recent advancements in terahertz wave applications for sensing, imaging, and high-speed communication have spurred a substantial demand for low-cost, easily accessible optical components capable of manipulating terahertz wave polarization. In this study, terahertz circular dichroism spectroscopic measurements of micrometer-sized metallic chiral helix arrays, fabricated using computer numerical control (CNC) machining, are presented. Experimental results demonstrate a giant circular dichroism of ±0.6 in an axial mode of operation for left- and right-handed arrays within a sub-terahertz frequency range. The helix array converts linearly polarized light into circularly polarized light from 120 GHz to 200 GHz, with a 3 dB axial ratio relative bandwidth approaching 50%. The polarization extinction ratio is in excess of 20 dB. These outstanding features, combined with their low cost, high accessibility, as well as their potential for mass production, pave the way for development of diverse range of optical components such as polarizers, filters, absorbers, and isolators operating in the terahertz frequency region. |
| format | Article |
| id | doaj-art-32cc0ef4e6f4452f980907ae15ff0ea1 |
| institution | Kabale University |
| issn | 2692-8388 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Journal of Microwaves |
| spelling | doaj-art-32cc0ef4e6f4452f980907ae15ff0ea12025-01-15T00:04:06ZengIEEEIEEE Journal of Microwaves2692-83882025-01-015110811510.1109/JMW.2024.350718810815599Terahertz Circular Dichroism Spectroscopy of 3D Chiral Metallic Microstructures Fabricated Using High Precision CNC MachiningAtsushi Ouchi0https://orcid.org/0009-0002-8947-5151Saroj R. Tripathi1https://orcid.org/0000-0002-5690-8654Department of Mechanical Engineering, Shizuoka University, Hamamatsu, JapanDepartment of Mechanical Engineering, Shizuoka University, Hamamatsu, JapanRecent advancements in terahertz wave applications for sensing, imaging, and high-speed communication have spurred a substantial demand for low-cost, easily accessible optical components capable of manipulating terahertz wave polarization. In this study, terahertz circular dichroism spectroscopic measurements of micrometer-sized metallic chiral helix arrays, fabricated using computer numerical control (CNC) machining, are presented. Experimental results demonstrate a giant circular dichroism of ±0.6 in an axial mode of operation for left- and right-handed arrays within a sub-terahertz frequency range. The helix array converts linearly polarized light into circularly polarized light from 120 GHz to 200 GHz, with a 3 dB axial ratio relative bandwidth approaching 50%. The polarization extinction ratio is in excess of 20 dB. These outstanding features, combined with their low cost, high accessibility, as well as their potential for mass production, pave the way for development of diverse range of optical components such as polarizers, filters, absorbers, and isolators operating in the terahertz frequency region.https://ieeexplore.ieee.org/document/10815599/Chiral metamaterialscircular polarizerdichroismoptical componentsspectroscopysub-terahertz |
| spellingShingle | Atsushi Ouchi Saroj R. Tripathi Terahertz Circular Dichroism Spectroscopy of 3D Chiral Metallic Microstructures Fabricated Using High Precision CNC Machining IEEE Journal of Microwaves Chiral metamaterials circular polarizer dichroism optical components spectroscopy sub-terahertz |
| title | Terahertz Circular Dichroism Spectroscopy of 3D Chiral Metallic Microstructures Fabricated Using High Precision CNC Machining |
| title_full | Terahertz Circular Dichroism Spectroscopy of 3D Chiral Metallic Microstructures Fabricated Using High Precision CNC Machining |
| title_fullStr | Terahertz Circular Dichroism Spectroscopy of 3D Chiral Metallic Microstructures Fabricated Using High Precision CNC Machining |
| title_full_unstemmed | Terahertz Circular Dichroism Spectroscopy of 3D Chiral Metallic Microstructures Fabricated Using High Precision CNC Machining |
| title_short | Terahertz Circular Dichroism Spectroscopy of 3D Chiral Metallic Microstructures Fabricated Using High Precision CNC Machining |
| title_sort | terahertz circular dichroism spectroscopy of 3d chiral metallic microstructures fabricated using high precision cnc machining |
| topic | Chiral metamaterials circular polarizer dichroism optical components spectroscopy sub-terahertz |
| url | https://ieeexplore.ieee.org/document/10815599/ |
| work_keys_str_mv | AT atsushiouchi terahertzcirculardichroismspectroscopyof3dchiralmetallicmicrostructuresfabricatedusinghighprecisioncncmachining AT sarojrtripathi terahertzcirculardichroismspectroscopyof3dchiralmetallicmicrostructuresfabricatedusinghighprecisioncncmachining |