Triple-helical nanowires by tomographic rotatory growth for chiral photonics

Marco Esposito, Vittorianna Tasco (), Francesco Todisco, Massimo Cuscunà, Alessio Benedetti, Daniele Sanvitto and Adriana Passaseo
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Marco Esposito: National Nanotechnology Laboratory-NNL, CNR-IMIP
Vittorianna Tasco: National Nanotechnology Laboratory-NNL, CNR-IMIP
Francesco Todisco: National Nanotechnology Laboratory-NNL, CNR-IMIP
Massimo Cuscunà: National Nanotechnology Laboratory-NNL, CNR-IMIP
Alessio Benedetti: Università di Roma La Sapienza, Dip. SBAI
Daniele Sanvitto: National Nanotechnology Laboratory-NNL, CNR-IMIP
Adriana Passaseo: National Nanotechnology Laboratory-NNL, CNR-IMIP

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract Three dimensional helical chiral metamaterials resulted in effective manipulation of circularly polarized light in the visible infrared for advanced nanophotonics. Their potentialities are severely limited by the lack of full rotational symmetry preventing broadband operation, high signal-to-noise ratio and inducing high optical activity sensitivity to structure orientation. Complex intertwined three dimensional structures such as multiple-helical nanowires could overcome these limitations, allowing the achievement of several chiro-optical effects combining chirality and isotropy. Here we report three dimensional triple-helical nanowires, engineered by the innovative tomographic rotatory growth, on the basis of focused ion beam-induced deposition. These three dimensional nanostructures show up to 37% of circular dichroism in a broad range (500–1,000 nm), with a high signal-to-noise ratio (up to 24 dB). Optical activity of up to 8° only due to the circular birefringence is also shown, tracing the way towards chiral photonic devices that can be integrated in optical nanocircuits to modulate the visible light polarization.

Date: 2015
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DOI: 10.1038/ncomms7484

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