The ubiquitous photonic wheel. (30th June 2016)
- Record Type:
- Journal Article
- Title:
- The ubiquitous photonic wheel. (30th June 2016)
- Main Title:
- The ubiquitous photonic wheel
- Authors:
- Aiello, Andrea
Banzer, Peter - Abstract:
- Abstract: A circularly polarized electromagnetic plane wave carries an electric field that rotates clockwise or counterclockwise around the propagation direction of the wave. According to the handedness of this rotation, its longitudinal spin angular momentum (AM) density is either parallel or antiparallel to the propagation of light. However, there are also light waves that are not simply plane and carry an electric field that rotates around an axis perpendicular to the propagation direction, thus yielding transverse spin AM density. Electric field configurations of this kind have been suggestively dubbed 'photonic wheels'. It has been recently shown that photonic wheels are commonplace in optics as they occur in electromagnetic fields confined by waveguides, in strongly focused beams, in plasmonic and evanescent waves. In this work we establish a general theory of electromagnetic waves propagating along a well defined direction, and carrying transverse spin AM density. We show that depending on the shape of these waves, the spin density may be either perpendicular to the mean linear momentum (globally transverse spin) or to the linear momentum density (locally transverse spin). We find that the latter case generically occurs only for non-diffracting beams, such as the Bessel beams. Moreover, we introduce the concept of meridional Stokes parameters to operationally quantify the transverse spin density. To illustrate our theory, we apply it to the exemplary cases of BesselAbstract: A circularly polarized electromagnetic plane wave carries an electric field that rotates clockwise or counterclockwise around the propagation direction of the wave. According to the handedness of this rotation, its longitudinal spin angular momentum (AM) density is either parallel or antiparallel to the propagation of light. However, there are also light waves that are not simply plane and carry an electric field that rotates around an axis perpendicular to the propagation direction, thus yielding transverse spin AM density. Electric field configurations of this kind have been suggestively dubbed 'photonic wheels'. It has been recently shown that photonic wheels are commonplace in optics as they occur in electromagnetic fields confined by waveguides, in strongly focused beams, in plasmonic and evanescent waves. In this work we establish a general theory of electromagnetic waves propagating along a well defined direction, and carrying transverse spin AM density. We show that depending on the shape of these waves, the spin density may be either perpendicular to the mean linear momentum (globally transverse spin) or to the linear momentum density (locally transverse spin). We find that the latter case generically occurs only for non-diffracting beams, such as the Bessel beams. Moreover, we introduce the concept of meridional Stokes parameters to operationally quantify the transverse spin density. To illustrate our theory, we apply it to the exemplary cases of Bessel beams and evanescent waves. These results open a new and accessible route to the understanding, generation and manipulation of optical beams with transverse spin AM density. … (more)
- Is Part Of:
- Journal of optics. Volume 18:Number 8(2016:Aug.)
- Journal:
- Journal of optics
- Issue:
- Volume 18:Number 8(2016:Aug.)
- Issue Display:
- Volume 18, Issue 8 (2016)
- Year:
- 2016
- Volume:
- 18
- Issue:
- 8
- Issue Sort Value:
- 2016-0018-0008-0000
- Page Start:
- Page End:
- Publication Date:
- 2016-06-30
- Subjects:
- c lines -- polarization -- transverse spin of light
Optics -- Periodicals
535.05 - Journal URLs:
- http://www.iop.org/EJ/journal/2040-8986 ↗
http://ioppublishing.org/ ↗ - DOI:
- 10.1088/2040-8978/18/8/085605 ↗
- Languages:
- English
- ISSNs:
- 2040-8978
- Deposit Type:
- Legaldeposit
- View Content:
- Available online (eLD content is only available in our Reading Rooms) ↗
- Physical Locations:
- British Library DSC - BLDSS-3PM
British Library HMNTS - ELD Digital store - Ingest File:
- 15057.xml