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Inverse design and optical vortex manipulation for thin-film absorption enhancement.

Munseong Bae1,2, Jaegang Jo2, Myunghoo Lee3

  • 1Department of Mechanical Engineering, Massachusetts Institute of Technology (MIT), Cambridge, MA 02139, USA.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
Summary

This study reveals how optical vortices (OVs) enhance light absorption in nanostructures. High-circularity OVs are key for optimizing absorbers for sensing and communication applications.

Keywords:
absorptioninverse designmetasurfaceoptical vortex

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Area of Science:

  • Photonics and Nanotechnology
  • Optical Physics

Background:

  • Optical vortices (OVs) feature unique phase and energy circulation.
  • OVs offer potential in optical sensing, communication, and imaging.

Purpose of the Study:

  • To demonstrate the correlation between OVs and absorption enhancement in nanostructures.
  • To introduce a metric for evaluating OV contribution to absorption.

Main Methods:

  • Designed a 1D structure using two coherent light sources to manipulate OVs.
  • Applied inverse design to optimize 2D ultrathin absorbers.
  • Introduced and utilized OV circularity to quantify OV field properties.

Main Results:

  • The 1D structure exhibited a 6.05-fold absorption gap influenced by OVs and incidence angle.
  • Optimized 2D free-form and grating absorbers achieved 99.90% and 97.85% absorptance, respectively.
  • High OV circularity (up to 96.14%) was observed in optimized structures, correlating with absorption enhancement.

Conclusions:

  • High-circularity localized OVs play a crucial role in optimizing nano-structured absorbers.
  • The findings support the use of OVs in advanced optical sensing and communication devices.