Graphene oxide (GO) is one of the most appealing bidimensional materials able to interact non-covalently with achiral molecules and to act as chiral inducers. Vortexes can tune chirality and, consequently transfer a specific handedness to non-covalent host molecules, either when dispersed in water or when deposited on a solid surface.
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Continuously tuneable single electrode pair liquid crystal optical vortex generators.
Nanophotonics
July 2024
Department of Engineering Science, University of Oxford, Oxford, UK.
In this work, we demonstrate the use of two-photon polymerization direct laser writing in the production of continuously tuneable optical vortex beam (OV) generators in a liquid crystal (LC) layer sandwiched between glass substrates. Results are presented that show how an OV generator can be inscribed into a 20 μm-thick LC layer and how the order of the OV beam can be tuned with the application of a voltage. Importantly, only a single pair of electrodes is needed to tune the order of the vortex as the required phase profile is generated through the 3D structuring of the polymer network using the laser writing process.
View Article and Find Full Text PDFQubit analog with polariton superfluid in an annular trap.
Sci Adv
October 2024
Key Laboratory for Quantum Materials of Zhejiang Province, Physics Department, Westlake University, 18 Shilongshan Rd, Hangzhou 310024, Zhejiang, China.
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National Center for Electron Microscopy, Molecular Foundry, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
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View Article and Find Full Text PDFElectrically Controlling Vortices in a Neutral Exciton-Polariton Condensate at Room Temperature.
Phys Rev Lett
September 2023
Department of Physics, School of Science, Tianjin University, Tianjin 300072, China.
Article Synopsis
- Manipulating bosonic condensates with electric fields is tough because the fields don't directly affect neutral particles, but this study presents a method to control exciton-polariton condensates using electric fields in liquid crystal microcavities.
- The researchers showed that by applying voltages between 1 to 10 V, they could create vortices with different topological charges in the condensates, utilizing the interplay of potential gradients and liquid crystal properties.
- This work not only enhances understanding of electric control in polariton systems at room temperature but also opens opportunities for developing micron-sized optical devices that can manipulate light for advanced information processing and photonic circuits.
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