skip to main content

SciTech ConnectSciTech Connect

Title: Constructive spin-orbital angular momentum coupling can twist materials to create spiral structures in optical vortex illumination

It was discovered that optical vortices twist isotropic and homogenous materials, e.g., azo-polymer films to form spiral structures on a nano- or micro-scale. However, the formation mechanism has not yet been established theoretically. To understand the mechanism of the spiral surface relief formation in the azo-polymer film, we theoretically investigate the optical radiation force induced in an isotropic and homogeneous material under irradiation using a continuous-wave optical vortex with arbitrary topological charge and polarization. It is revealed that the spiral surface relief formation in azo-polymer films requires the irradiation of optical vortices with a positive (negative) spin angular momentum and a positive (negative) orbital angular momentum (constructive spin-orbital angular momentum coupling), i.e., the degeneracy among the optical vortices with the same total angular momentum is resolved.
Authors:
 [1] ;  [2] ; ;  [3] ; ;  [3] ;  [4] ;  [1] ;  [5]
  1. Graduate School of Engineering, Utsunomiya University, Utsunomiya 321-8585 (Japan)
  2. (CORE), Utsunomiya University, Utsunomiya 321-8585 (Japan)
  3. Graduate School of Advanced Integration Science, Chiba University, Chiba 263-8522 (Japan)
  4. (Japan)
  5. Graduate School of Science, Tohoku University, Sendai 980-8578 (Japan)
Publication Date:
OSTI Identifier:
22489389
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 108; Journal Issue: 5; Other Information: (c) 2016 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; COUPLING; FILMS; ILLUMINANCE; IRRADIATION; MATERIALS; ORBITAL ANGULAR MOMENTUM; POLARIZATION; POLYMERS; SPIN; SURFACES; TOPOLOGY