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Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
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Switchable Induced-Transmission Filters Enabled by Vanadium Dioxide.

Chenghao Wan1,2, David Woolf3, Colin M Hessel3

  • 1Department of Electrical and Engineering, University of Wisconsin─Madison, Madison, Wisconsin 53706, United States.

Nano Letters
|December 27, 2021
PubMed
Summary
This summary is machine-generated.

Researchers developed a switchable mid-infrared induced-transmission filter (ITF) using vanadium dioxide (VO2). This tunable device modulates filter responses, enabling single-band to multiband functionality by switching the metallic layer on and off.

Keywords:
VO2phase-change materialsthin-film filterstunable filters

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Induced-transmission filters (ITFs) utilize ultrathin metallic layers in dielectric filters to isolate specific transmission bands.
  • Traditional ITFs offer fixed spectral selectivity, limiting their adaptability in dynamic optical systems.

Purpose of the Study:

  • To introduce a novel switchable mid-infrared ITF with dynamically controllable spectral characteristics.
  • To demonstrate the feasibility of integrating vanadium dioxide (VO2) for tunable filter applications.

Main Methods:

  • Fabrication of a subwavelength vanadium dioxide (VO2) film on a suspended membrane.
  • Integration of the VO2 film into a dielectric thin-film bandpass filter structure.
  • Characterization of the filter's response modulation via the insulator-to-metal phase transition of VO2.

Main Results:

  • Demonstrated a switchable mid-infrared ITF with the ability to transition between single-band and multiband transmission.
  • Achieved reversible modulation of filter response by leveraging the phase transition of VO2.
  • Established a fabrication process compatible with physical vapor deposition for tunable thin-film filters.

Conclusions:

  • The developed switchable ITF represents a generalization of traditional ITFs, creating a new class of tunable optical devices.
  • The VO2-based fabrication platform offers a versatile method for integrating tunable functionalities into various thin-film optical assemblies.