Observation of spin-polarized directive coupling of light at bound states in the continuum

Zito, Gianluigi; Romano, Silvia; Cabrini, Stefano; Calafiore, Giuseppe; De Luca, Anna Chiara; Penzo, Erika; Mocella, Vito

doi:10.1364/optica.6.001305

Title: Observation of spin-polarized directive coupling of light at bound states in the continuum

Abstract

Spin-polarized directive coupling of light associated with the photonic quantum spin-Hall effect (QSHE) is a nanoscale phenomenon based on strong spin–orbit interaction that has recently attracted significant attention. Herein, we discuss the experimental manifestation of QSHE intrinsic in the Bloch waves associated with a bound state in the continuum (BIC) of a dielectric photonic crystal metasurface (PhCM). We show numerically that BICs in nanoscale PhCMs have photonic spin angular momentum density transverse to the orbital momentum not only at the interfaces but also inside the confining dielectric medium. Then, we experimentally demonstrate that the fundamental Bloch waves of the BIC mode, macroscopically amplified on resonance, propagate along the symmetry axes of the PhCM obeying spin-momentum locking also at normal incidence, i.e., with no symmetry breaking. This BIC-enhanced spin-directive coupling of light may enable versatile implementations of spin-optical structures, paving the way for novel photonic spin multiplatform devices.

Authors:

^[1];

^[1]; Cabrini, Stefano ^[2]; Calafiore, Giuseppe ^[2]; De Luca, Anna Chiara ^[1]; Penzo, Erika ^[2]; Mocella, Vito ^[1]

National Research Council, Naples (Italy)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Publication Date:: Mon Sep 30 00:00:00 EDT 2019

Research Org.:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Org.:: USDOE Office of Science (SC), Basic Energy Sciences (BES); Ministry of Education, University and Research (MIUR)

OSTI Identifier:: 1597720

Grant/Contract Number:: AC02-05CH11231; PRIN 2017 0002501

Resource Type:: Accepted Manuscript

Journal Name:: Optica

Additional Journal Information:: Journal Volume: 6; Journal Issue: 10; Journal ID: ISSN 2334-2536

Publisher:: Optical Society of America

Country of Publication:: United States

Language:: English

Subject:: 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats


                    Zito, Gianluigi, Romano, Silvia, Cabrini, Stefano, Calafiore, Giuseppe, De Luca, Anna Chiara, Penzo, Erika, and Mocella, Vito. Observation of spin-polarized directive coupling of light at bound states in the continuum.  United States: N. p., 2019. 
Web.  doi:10.1364/optica.6.001305.

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                    Zito, Gianluigi, Romano, Silvia, Cabrini, Stefano, Calafiore, Giuseppe, De Luca, Anna Chiara, Penzo, Erika, & Mocella, Vito. Observation of spin-polarized directive coupling of light at bound states in the continuum.  United States.  https://doi.org/10.1364/optica.6.001305

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                    Zito, Gianluigi, Romano, Silvia, Cabrini, Stefano, Calafiore, Giuseppe, De Luca, Anna Chiara, Penzo, Erika, and Mocella, Vito. Mon .  
"Observation of spin-polarized directive coupling of light at bound states in the continuum".  United States.  https://doi.org/10.1364/optica.6.001305.  https://www.osti.gov/servlets/purl/1597720.

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@article{osti_1597720,

  title        = {Observation of spin-polarized directive coupling of light at bound states in the continuum},

  author       = {Zito, Gianluigi and Romano, Silvia and Cabrini, Stefano and Calafiore, Giuseppe and De Luca, Anna Chiara and Penzo, Erika and Mocella, Vito},

  abstractNote = {Spin-polarized directive coupling of light associated with the photonic quantum spin-Hall effect (QSHE) is a nanoscale phenomenon based on strong spin–orbit interaction that has recently attracted significant attention. Herein, we discuss the experimental manifestation of QSHE intrinsic in the Bloch waves associated with a bound state in the continuum (BIC) of a dielectric photonic crystal metasurface (PhCM). We show numerically that BICs in nanoscale PhCMs have photonic spin angular momentum density transverse to the orbital momentum not only at the interfaces but also inside the confining dielectric medium. Then, we experimentally demonstrate that the fundamental Bloch waves of the BIC mode, macroscopically amplified on resonance, propagate along the symmetry axes of the PhCM obeying spin-momentum locking also at normal incidence, i.e., with no symmetry breaking. This BIC-enhanced spin-directive coupling of light may enable versatile implementations of spin-optical structures, paving the way for novel photonic spin multiplatform devices.},

  doi          = {10.1364/optica.6.001305},

  journal      = {Optica},

  number       = 10,

  volume       = 6,

  place        = {United States},

  year         = {Mon Sep 30 00:00:00 EDT 2019},

  month        = {Mon Sep 30 00:00:00 EDT 2019}

}

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