Observation of spin-polarized directive coupling of light at bound states in the continuum
- National Research Council, Naples (Italy)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
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.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); Ministry of Education, University and Research (MIUR)
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1597720
- Journal Information:
- Optica, Journal Name: Optica Journal Issue: 10 Vol. 6; ISSN 2334-2536
- Publisher:
- Optical Society of AmericaCopyright Statement
- Country of Publication:
- United States
- Language:
- English
Vectorial light–matter interaction: Exploring spatially structured complex light fields
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journal | October 2020 |
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