Broadband chirality-coded meta-aperture for photon-spin resolving

Luping Du, Shan Shan Kou, Eugeniu Balaur, Jasper J. Cadusch, Ann Roberts, Brian Abbey, Xiao-Cong Yuan (), Dingyuan Tang () and Jiao Lin ()
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Luping Du: Nanophotonics Research Centre, Shenzhen University & Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University
Shan Shan Kou: School of Physics, The University of Melbourne, Tin Alley, Melbourne, Victoria 3010, Australia
Eugeniu Balaur: La Trobe Institute for Molecular Science (LIMS), La Trobe University
Jasper J. Cadusch: School of Physics, The University of Melbourne, Tin Alley, Melbourne, Victoria 3010, Australia
Ann Roberts: School of Physics, The University of Melbourne, Tin Alley, Melbourne, Victoria 3010, Australia
Brian Abbey: La Trobe Institute for Molecular Science (LIMS), La Trobe University
Xiao-Cong Yuan: Nanophotonics Research Centre, Shenzhen University & Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University
Dingyuan Tang: School of Electrical and Electronic Engineering, Nanyang Technological University
Jiao Lin: Nanophotonics Research Centre, Shenzhen University & Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University

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

Abstract: Abstract The behaviour of light transmitted through an individual subwavelength aperture becomes counterintuitive in the presence of surrounding ‘decoration’, a phenomenon known as the extraordinary optical transmission. Despite being polarization-sensitive, such an individual nano-aperture, however, often cannot differentiate between the two distinct spin-states of photons because of the loss of photon information on light-aperture interaction. This creates a ‘blind-spot’ for the aperture with respect to the helicity of chiral light. Here we report the development of a subwavelength aperture embedded with metasurfaces dubbed a ‘meta-aperture’, which breaks this spin degeneracy. By exploiting the phase-shaping capabilities of metasurfaces, we are able to create specific meta-apertures in which the pair of circularly polarized light spin-states produces opposite transmission spectra over a broad spectral range. The concept incorporating metasurfaces with nano-apertures provides a venue for exploring new physics on spin-aperture interaction and potentially has a broad range of applications in spin-optoelectronics and chiral sensing.

Date: 2015
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DOI: 10.1038/ncomms10051

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