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| (left): Schematic representation of twisted hollow-core fibre exhibiting helical dichroism. When launching vortex beams of topological charge l=±1 into the waveguide, the transmission strongly depends on the sign of l. Figure 2 (right): Measured transmission for excitation of the fundamental mode (FM, l=0) and for vortex beams coupled into the twisted hollow-core fiber (square/star markers for s=±1). © MPL / ACS Photonics. |
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