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Manipulation enhancement of terahertz liquid crystal phase shifter magnetically induced by magnetic nanoparticles

Abstract

Ferromagnetic liquid crystals (FLCs), the suspensions of magnetic nanoparticle dispersed at different concentrations in liquid crystals (LCs), and its special magnetically induced birefringence characteristics have been investigated in the terahertz regime, mainly focusing on the interaction between magnetic cluster chains and LC molecules. We experimentally demonstrated the surface anchoring effect of the magnetic cluster chains on LC molecules in an mm-thick LC cell under an extremely weak external magnetic field (EMF), which leading to a uniform anchoring arrangement of the LC molecules in the entire LC cell. Unlike pure 5CB LCs, the phase shift range of the FLCs at 1.45 THz up to π (no to ne or ne to no) can achieve over the whole tunable range by simply changing the magnitude of the EMF without changing its direction, and the optical axis of LC molecules can be controlled to rotate by 90°, thereby realizing a tunable THz wave plate. This work provides a new way in the development of THz magneto-optic devices and phase devices.

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Publication details

The article was received on 16 Nov 2018, accepted on 13 Feb 2019 and first published on 13 Feb 2019


Article type: Paper
DOI: 10.1039/C8NR09259A
Citation: Nanoscale, 2019, Accepted Manuscript

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    Manipulation enhancement of terahertz liquid crystal phase shifter magnetically induced by magnetic nanoparticles

    Y. Ji, F. Fan, S. Xu, J. Yu and S. Chang, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR09259A

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