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Thermo-optic epsilon-near-zero effects.

Jiaye Wu1, Marco Clementi2, Chenxingyu Huang3,4

  • 1École Polytechnique Fédérale de Lausanne (EPFL), Photonic Systems Laboratory (PHOSL), STI-IEM, Station 11, Lausanne, CH-1015, Switzerland. jiaye.wu@epfl.ch.

Nature Communications
|January 26, 2024
PubMed
Summary
This summary is machine-generated.

This study reveals significant thermo-optic effects in epsilon-near-zero (ENZ) nanodevices, enhancing nonlinear optical properties. These findings are crucial for developing advanced integrated photonic circuits and nonlinear photonic applications.

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Area of Science:

  • Photonics and Nanotechnology
  • Materials Science

Background:

  • Nonlinear epsilon-near-zero (ENZ) nanodevices offer CMOS-compatible solutions for integrated systems-on-chips.
  • Heat generation in confined ENZ systems poses challenges for semiconductor-based performance.
  • The temperature sensitivity of ENZ optical properties lacks systematic investigation.

Purpose of the Study:

  • To experimentally investigate the linear and nonlinear thermo-optic effects in indium tin oxide (ITO) within ENZ conditions.
  • To characterize the temperature-dependent optical properties of ITO across telecommunication bands.
  • To quantify the enhancement of thermo-optic effects and group velocity dispersion due to ENZ conditions.

Main Methods:

  • Experimental characterization of temperature-dependent optical properties of ITO.
  • Analysis of linear and nonlinear thermo-optic effects at ENZ frequencies.
  • Measurement of group velocity dispersion and its temperature dependence.

Main Results:

  • Indium tin oxide exhibits significant linear and nonlinear thermo-optic effects at ENZ frequencies.
  • An unprecedented 660-955% enhancement in thermo-optic effect was observed across broadband frequencies.
  • ENZ-induced group velocity dispersion and its temperature dependence were reported for the first time, alongside a 1113-2866% enhancement in thermo-optic nonlinearity.

Conclusions:

  • The study provides critical data for designing packaged ENZ-enabled photonic integrated circuits.
  • A new platform for nonlinear photonic applications and emulations utilizing thermo-optic effects is presented.
  • Understanding thermo-optic properties is essential for optimizing performance in ENZ nanodevices.