title: Broadband chirality-coded meta-aperture for photon-spin resolving.
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.
authors.affiliation: 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, Shenzhen 518060, China.|School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore.|School of Physics, The University of Melbourne, Tin Alley, Melbourne, Victoria 3010, Australia.
authors.forename: Luping
authors.initials: L
authors.lastname: Du
authors.affiliation: School of Physics, The University of Melbourne, Tin Alley, Melbourne, Victoria 3010, Australia.|Department of Chemistry and Physics, La Trobe Institute for Molecular Science (LIMS), La Trobe University, Melbourne, Victoria 3086, Australia.|Australian Research Council Centre of Excellence for Advanced Molecular Imaging, Australia.
authors.forename: Shan Shan
authors.initials: SS
authors.lastname: Kou
authors.affiliation: Department of Chemistry and Physics, La Trobe Institute for Molecular Science (LIMS), La Trobe University, Melbourne, Victoria 3086, Australia.|Australian Research Council Centre of Excellence for Advanced Molecular Imaging, Australia.
authors.forename: Eugeniu
authors.initials: E
authors.lastname: Balaur
authors.affiliation: School of Physics, The University of Melbourne, Tin Alley, Melbourne, Victoria 3010, Australia.
authors.forename: Jasper J
authors.initials: JJ
authors.lastname: Cadusch
authors.affiliation: School of Physics, The University of Melbourne, Tin Alley, Melbourne, Victoria 3010, Australia.
authors.forename: Ann
authors.initials: A
authors.lastname: Roberts
authors.affiliation: Department of Chemistry and Physics, La Trobe Institute for Molecular Science (LIMS), La Trobe University, Melbourne, Victoria 3086, Australia.|Australian Research Council Centre of Excellence for Advanced Molecular Imaging, Australia.
authors.forename: Brian
authors.initials: B
authors.lastname: Abbey
authors.affiliation: 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, Shenzhen 518060, China.
authors.forename: Xiao-Cong
authors.initials: XC
authors.lastname: Yuan
authors.affiliation: School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore.
authors.forename: Dingyuan
authors.initials: D
authors.lastname: Tang
authors.affiliation: 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, Shenzhen 518060, China.|School of Physics, The University of Melbourne, Tin Alley, Melbourne, Victoria 3010, Australia.|School of Electrical and Computer Engineering, RMIT University, Melbourne, Victoria 3001, Australia.
authors.forename: Jiao
authors.initials: J
authors.lastname: Lin