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Unveiling Local Optical Properties Using Nanoimaging Phase Mapping in High-Index Topological Insulator Bi2Se3

Sukanta Nandi1,2, Shany Z Cohen1,2, Danveer Singh1,2

  • 1Faculty of Engineering, Bar-Ilan University, Ramat Gan 5290002, Israel.

Nano Letters
|October 27, 2023
PubMed
Summary

Topological insulators like bismuth selenide nanobeams exhibit unique mid-infrared optical properties. These materials support Mie resonances and significant phase shifts, paving the way for advanced photonic devices.

Keywords:
Mie resonatorTopological insulatorbismuth selenidemid-infraredphase-mappings-SNOM

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanophotonics

Background:

  • Topological insulators possess insulating bulk and conductive surface states, ideal for quantum and optoelectronic applications.
  • Their mid-infrared (MIR) optical properties and photonic potential remain largely unexplored.
  • Bismuth selenide (Bi2Se3) is a well-known topological insulator with potential for novel optical applications.

Purpose of the Study:

  • To investigate the mid-infrared (MIR) optical properties of bismuth selenide (Bi2Se3) nanobeams (NBs).
  • To explore the potential of Bi2Se3 nanostructures in photonic and quantum device applications.

Main Methods:

  • Utilized a combination of far-field and near-field nanoscale imaging and spectroscopy.
  • Performed optical constant extraction for Bi2Se3 in the MIR spectrum.
  • Employed near-field reflection phase mapping and finite-difference time-domain (FDTD) simulations.

Main Results:

  • Extracted MIR optical constants for Bi2Se3, showing a high refractive index (n ~ 6.4).
  • Demonstrated that Bi2Se3 NBs support Mie resonances across the MIR spectrum.
  • Measured up to 2π phase shifts across resonances, matching FDTD simulation results.

Conclusions:

  • Bi2Se3 nanobeams exhibit significant potential for mid-infrared photonic applications.
  • The unique optical properties suggest applications in quantum circuitry, nonlinear optics, high-Q metaphotonics, and photodetectors.