| Autor: |
Rajour Tanyi Ako, Wendy S. L. Lee, Shaghik Atakaramians, Madhu Bhaskaran, Sharath Sriram, Withawat Withayachumnankul |
| Jazyk: |
angličtina |
| Rok vydání: |
2020 |
| Předmět: |
|
| Zdroj: |
APL Photonics, Vol 5, Iss 4, Pp 046101-046101-7 (2020) |
| Druh dokumentu: |
article |
| ISSN: |
2378-0967 |
| DOI: |
10.1063/1.5144115 |
| Popis: |
Polarization control is shown to enhance functionalities of terahertz waves in various applications. As a step toward introducing efficient practical devices operating in the terahertz band, we propose and experimentally validate a free-standing three-layer polarization converter operating in transmission. The device can efficiently convert a linearly polarized terahertz wave to its orthogonal counterpart. Our device comprises split-ring and H-shaped resonators inserted between two layers of orthogonal wire gratings. The sole dielectric material is a cyclic olefin copolymer (COC) that has exceptionally low-loss to terahertz waves. The measurement demonstrates a conversion efficiency of >80%, over 0.2–1.0 THz, giving an ultra-wide bandwidth of 133%. The wide bandwidth is attributed to multiple resonances of the two resonators in a unit cell. Importantly, an unconventional fabrication process yields a multi-layer low-loss COC that leads to high efficiency. The proposed design can also be tailored for practical applications across the electromagnetic spectrum. |
| Databáze: |
Directory of Open Access Journals |
| Externí odkaz: |
|
