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

Taimoor Naeem, Hafiz Saad Khaliq, Muhammad Zubair, Tauseef Tauqeer, Muhammad Qasim Mehmood

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

Ultrafast modulation of the refractive index exhibits either linear or nonlinear electro-optic (EO) effect, which is extensively utilized in tunable photonic circuits. Silicon, a mature material for on-chip devices, lacks a strong electro-optic (EO) Pockels effect. Utilization of the Pockels effect alters the intrinsic property (refractive index) of the material that manifests tunability and offers expanded functionalities. Driven by the limited space constraints in data storage, sensing, and imaging applications, we propose an electrically tunable meta-device whose resonance wavelength and focal length can be tuned by varying applied electric fields in the visible range. The fundamental unit of a metalens is the barium titanate (BTO) diffractive optical element placed on indium titanium oxide (which serves as an electrode) with SiO2as the substrate. The metalens' tunability is characterized by point spread function (PSF), full-width half-maximum (FWHM), and imaging bandwidth that demonstrates the tuning of resonance wavelength and focal length. Moreover, polarization-insensitive meta-holograms are realized at a wavelength of 633 nm without utilizing propagation and Pancharatnam-Berry (PB) phase. The proposed study can find exciting applications in machine vision, broadband microscopy, and spectroscopy.
Original languageEnglish (US)
Pages (from-to)13220-13228
Number of pages9
JournalRSC ADVANCES
Volume11
Issue number22
DOIs
StatePublished - Apr 8 2021
Externally publishedYes

Bibliographical note

Generated from Scopus record by KAUST IRTS on 2023-09-20

ASJC Scopus subject areas

  • General Chemical Engineering
  • General Chemistry

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