Journal
COATINGS
Volume 11, Issue 5, Pages -Publisher
MDPI
DOI: 10.3390/coatings11050578
Keywords
metamaterials; liquid crystals; terahertz filters
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Funding
- Ministry of Science and Technology (MOST) of Taiwan [MOST 107-2112-M-029-005-MY3]
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The thickness of the liquid crystal (LC) layer plays a crucial role in its terahertz birefringence, with both too thick and too thin layers resulting in small birefringence. Research shows that at a specific thickness, the LC layer can exhibit a significant terahertz birefringence.
A liquid crystal (LC) layer that is too thick exhibits a small terahertz birefringence due to the limited long-range force of the alignment layers that exert on it. An LC layer that is too thin has a small terahertz birefringence due to its invisibility to incident terahertz waves. Therefore, an LC layer may have a large terahertz birefringence at a specific thickness. It is well known that the birefringence of an LC layer dominates the shift of the resonance frequency of the metamaterial imbedded into the LC layer. As a result, this work studies the effect of the thicknesses of LC layers on the shift of the resonance frequencies of metamaterials. LC layers with various thicknesses ranging from 310 mu m to 1487 mu m are deposited on terahertz metamaterials, and each of the layers is aligned by two polyimide layers that are rubbed in a direction. The terahertz metamaterials have a maximum frequency shifting range of 21 GHz as 710 mu m thick LC layers with mutually orthogonal rubbing directions are deposited on them. The maximum frequency shifting range arises from the competition between the long-range force of the polyimide layers and the interaction between the LC layers and their incident terahertz waves.
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