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Engineering tunability through electro-optic effects to manifest a multifunctional metadevice.

Taimoor Naeem1, Hafiz Saad Khaliq1, Muhammad Zubair1

  • 1NanoTech Lab, Department of Electrical Engineering, Information Technology University (ITU) of the Punjab Ferozepur Road Lahore 54600 Pakistan tauseef.tauqeer@itu.edu.pk qasim.mehmood@itu.edu.pk muhammad.zubair@itu.edu.pk.

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Summary

Researchers developed an electrically tunable meta-device using barium titanate for tunable photonic circuits. This device allows for ultrafast modulation of refractive index, enabling new possibilities in sensing and imaging applications.

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Area of Science:

  • Photonics and Materials Science
  • Nanotechnology and Metamaterials
  • Electro-optics

Background:

  • Silicon photonics lacks a strong electro-optic (EO) Pockels effect, limiting tunability in photonic circuits.
  • Ultrafast refractive index modulation is crucial for tunable photonic devices.
  • Limited space in data storage, sensing, and imaging drives the need for compact tunable meta-devices.

Purpose of the Study:

  • To propose and demonstrate an electrically tunable meta-device for visible light applications.
  • To achieve tunable resonance wavelength and focal length using applied electric fields.
  • To realize polarization-insensitive meta-holograms without relying on propagation or Pancharatnam-Berry (PB) phase.

Main Methods:

  • Fabrication of a meta-device using barium titanate (BTO) diffractive optical elements on indium titanium oxide electrodes with a SiO2 substrate.
  • Characterization of meta-device tunability through point spread function (PSF), full-width half-maximum (FWHM), and imaging bandwidth.
  • Demonstration of polarization-insensitive meta-holograms at 633 nm.

Main Results:

  • The meta-device exhibits tunable resonance wavelength and focal length in the visible range via electric field modulation.
  • Key performance metrics like PSF, FWHM, and imaging bandwidth confirm the device's tunability.
  • Successful realization of polarization-insensitive meta-holograms at 633 nm, bypassing conventional phase mechanisms.

Conclusions:

  • The proposed electrically tunable meta-device offers a promising solution for compact and versatile photonic applications.
  • The ability to tune optical properties using electric fields expands functionalities for on-chip devices.
  • Potential applications include machine vision, broadband microscopy, and spectroscopy.