All known methods for transverse confinement and guidan ceof light rely on modification of the refractive index, that is, on the scalar properties of electromagnetic radiation. Here, we disclose the concept of a dielectric waveguide that exploits vectorial spin–orbit interactions of light and the resulting geometric phases. The approach relies on the use of anisotropic media with an optic axis that lies orthogonal to the propagation direction but is spatially modulated, so that the refractive index remains constant everywhere. A spin-controlled cumulative phase distortion is imposed on the beam, balancing diffraction for a specific polarization. As well as theoretical analysis, we present an experimental demonstration of the guidance using a series of discrete geometric-phase lenses made from liquid crystal. Our findings show that geometric phases may determine the optical guiding behavior well beyond a Rayleigh length, paving the way to a new class of photonic devices. The concept is applicable to the whole electromagnetic spectrum.

Guiding light via geometric phases / Slussarenko, Sergei; Alberucci, Alessandro; Jisha, Chandroth P.; Piccirillo, Bruno; Santamato, Enrico; Assanto, Gaetano; Marrucci, Lorenzo. - In: NATURE PHOTONICS. - ISSN 1749-4885. - 10:9(2016), pp. 571-575. [10.1038/nphoton.2016.138]

Guiding light via geometric phases

SLUSSARENKO, SERGEI;PICCIRILLO, BRUNO;SANTAMATO, ENRICO;MARRUCCI, LORENZO
2016

Abstract

All known methods for transverse confinement and guidan ceof light rely on modification of the refractive index, that is, on the scalar properties of electromagnetic radiation. Here, we disclose the concept of a dielectric waveguide that exploits vectorial spin–orbit interactions of light and the resulting geometric phases. The approach relies on the use of anisotropic media with an optic axis that lies orthogonal to the propagation direction but is spatially modulated, so that the refractive index remains constant everywhere. A spin-controlled cumulative phase distortion is imposed on the beam, balancing diffraction for a specific polarization. As well as theoretical analysis, we present an experimental demonstration of the guidance using a series of discrete geometric-phase lenses made from liquid crystal. Our findings show that geometric phases may determine the optical guiding behavior well beyond a Rayleigh length, paving the way to a new class of photonic devices. The concept is applicable to the whole electromagnetic spectrum.
2016
Guiding light via geometric phases / Slussarenko, Sergei; Alberucci, Alessandro; Jisha, Chandroth P.; Piccirillo, Bruno; Santamato, Enrico; Assanto, Gaetano; Marrucci, Lorenzo. - In: NATURE PHOTONICS. - ISSN 1749-4885. - 10:9(2016), pp. 571-575. [10.1038/nphoton.2016.138]
File in questo prodotto:
File Dimensione Formato  
geolightguide_arXiv2_postprint.pdf

Open Access dal 02/02/2017

Descrizione: Postprint version of the final accepted manuscript
Tipologia: Documento in Post-print
Licenza: Dominio pubblico
Dimensione 3.52 MB
Formato Adobe PDF
3.52 MB Adobe PDF Visualizza/Apri

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/645949
Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 92
  • ???jsp.display-item.citation.isi??? 83
social impact