All-optical dynamic focusing of light via coherent absorption in a plasmonic metasurface

Maria Papaioannou; Eric Plum; Edward TF Rogers; Nikolay I Zheludev

doi:10.1038/lsa.2017.157

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All-optical dynamic focusing of light via coherent absorption in a plasmonic metasurface

Original Articles

- All-optical dynamic focusing of light via coherent absorption in a plasmonic metasurface
- Light: Science & Applications Vol. 7, Issue 2, (2018)
- Affiliations：
  
  1.Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Highfield, Southampton SO17 1BJ, UK
  2.Institute for Life Sciences, University of Southampton, Highfield, Southampton SO17 1BJ, UK
  3.Centre for Disruptive Photonic Technologies, School of Physical and Mathematical Sciences and The Photonics Institute, Nanyang Technological University, Singapore 637371, Singapore
- Author bio：
  
  E Plum, Email: erp@orc.soton.ac.uk
  NI Zheludev, Email: niz@orc.soton.ac.uk
- Funds：
- DOI：10.1038/lsa.2017.157
  CLC：
- Published：2018，
  
  Published Online：23 March 2018，
  
  Received：15 August 2017，
  
  Revised：10 November 2017，
  
  Accepted：11 November 2017
- Accepted：
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Papaioannou, M. et al. All-optical dynamic focusing of light via coherent absorption in a plasmonic metasurface. Light: Science & Applications, 2, 17157 (2018).
DOI：

Papaioannou, M. et al. All-optical dynamic focusing of light via coherent absorption in a plasmonic metasurface. Light: Science & Applications, 2, 17157 (2018). DOI： 10.1038/lsa.2017.157.

摘要

Abstract

Vision

microscopy

imaging

optical data projection and storage all depend on focusing of light. Dynamic focusing is conventionally achieved with mechanically reconfigurable lenses

spatial light modulators or microfluidics. Here we demonstrate that dynamic control of focusing can be achieved through coherent interaction of optical waves on a thin beam splitter. We use a nanostructured plasmonic metasurface of subwavelength thickness as the beam splitter

allowing operation in the regimes of coherent absorption and coherent transparency. Focusing of light resulting from illumination of the plasmonic metasurface with a Fresnel zone pattern is controlled by another patterned beam projected on the same metasurface. By altering the control pattern

its phase

or its intensity

we switch the lens function on and off

and alter the focal spot's depth

diameter and intensity. Switching occurs as fast as the control beam is modulated and therefore tens of gigahertz modulation bandwidth is possible with electro-optical modulators

which is orders of magnitude faster than conventional dynamic focusing technologies.

关键词

Keywords

all-optical dynamic focusingcoherent controlcoherent perfect absorptionmetasurfaces

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