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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
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Thermoplasmonic Controlled Optical Absorber Based on a Liquid Crystal Metasurface.

Francesca Petronella1, Tristan Madeleine2, Vincenzo De Mei3

  • 1National Research Council of Italy, Institute of Crystallography, CNR-IC, Rome Division, Area della Ricerca Roma 1 Strada Provinciale 35d, n. 9, 00010 Montelibretti (RM), Italy.

ACS Applied Materials & Interfaces
|October 10, 2023
PubMed
Summary
This summary is machine-generated.

This study introduces a novel metasurface optical absorber using silver nanocubes and liquid crystals. This innovative design achieves tunable light absorption in the near-infrared spectrum, paving the way for adaptive optical components.

Keywords:
active controlcolloidal nanoparticlesliquid crystalslithography-freemetasurfacethermoplasmonics

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Area of Science:

  • Nanophotonics and Metamaterials
  • Liquid Crystal Photonics
  • Optical Absorber Technology

Background:

  • Metasurfaces, composed of subwavelength elements, offer excellent optical properties but lack dynamic tunability.
  • Existing metasurfaces are limited in their ability to function as adaptive optical components.
  • There is a need for dynamically controlled optical devices utilizing metasurface technology.

Purpose of the Study:

  • To develop a tunable metasurface-based optical absorber.
  • To integrate nematic liquid crystals (NLCs) with a metasurface for dynamic control.
  • To demonstrate a light-controllable optical absorber with tunable absorption bands.

Main Methods:

  • Fabrication of a metasurface using self-assembled silver nanocubes (AgNCs) on a gold layer with a polyelectrolyte dielectric spacer.
  • Integration of the metasurface with a planarly aligned nematic liquid crystal (NLC) layer via photoaligned substrate.
  • Spectroscopic and thermographic investigations to characterize optical properties and tunability.

Main Results:

  • The fabricated optical absorbers exhibited a distinct reflection band in the near-infrared (750-770 nm).
  • High absorption efficiency (∼60%) at the resonant wavelength and significant photothermal efficiency (time constant 34 s) were observed.
  • The combined metasurface-NLC system demonstrated a photothermally tunable absorption band over approximately 46 nm.

Conclusions:

  • The developed metasurface-NLC hybrid structure provides a highly effective and tunable optical absorber.
  • This active metasurface exhibits extraordinary capability for light-controllable absorption.
  • The findings enable the development of a new generation of dynamically controlled adaptive optical components.