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Optical Pulling Using Chiral Metalens as a Photonic Probe.

Miao Peng1, Hui Luo1, Zhaojian Zhang2

  • 1College of Advanced Interdisciplinary Studies, National University of Defense Technology, Changsha 410073, China.

Nanomaterials (Basel, Switzerland)
|December 24, 2021
PubMed
Summary

Researchers developed a chiral metalens to generate optical pulling forces, enabling tunable manipulation of objects. This breakthrough offers new possibilities for contactless fabrication and advanced optical control.

Keywords:
broadband spectrumchiral metalenscircular dichroismoptical pulling forcesphotonic probe

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Area of Science:

  • Photonics and Nanotechnology
  • Optical Manipulation

Background:

  • Optical pulling forces can manipulate objects towards the light source.
  • Conventional methods using lenses or prisms are too large for microscale manipulation.
  • Tailoring electromagnetic fields, environments, or particle properties are current approaches.

Purpose of the Study:

  • To design a chiral metalens as a photonic probe for generating optical pulling forces.
  • To achieve robust optical pulling forces with a broadband spectrum.
  • To investigate the tunability of optical forces via polarization control.

Main Methods:

  • Designing and fabricating a chiral metalens.
  • Characterizing the induced optical pulling force over a broadband spectrum (1.517–2.117 μm).
  • Analyzing the longitudinal optical force response under different circular polarization states.

Main Results:

  • A robust optical pulling force was generated by the chiral metalens.
  • The force was characterized over a 0.6 μm bandwidth, reaching -83.76 pN/W.
  • A circular dichroism response was observed, allowing tunable optical forces from pulling to pushing by controlling polarization.

Conclusions:

  • A chiral metalens enables effective optical pulling force generation and manipulation.
  • The polarization-dependent response allows flexible control over optical forces.
  • This technique has potential applications in contactless fabrication, cell assembly, and spacecraft control.