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Lithium niobate thin film electro-optic modulator.

Jikun Liu1, Lun Qu1, Wei Wu1

  • 1The Key Laboratory of Weak-Light Nonlinear Photonics, Ministry of Education, School of Physics and TEDA Applied Physics Institute, Nankai University, Tianjin 300071, People's Republic of China.

Nanophotonics (Berlin, Germany)
|December 16, 2024
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Summary

This study presents a new lithium niobate electro-optic modulator using a Fabry-Pérot resonator. It achieves efficient light modulation with a simpler fabrication process and larger amplitudes.

Keywords:
Fabry–Pérot resonancePockels effectelectro-optic modulatorlithium niobate film

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Area of Science:

  • Photonics and optical engineering
  • Materials science
  • Solid-state physics

Background:

  • The linear electro-optic effect enables light control via electric fields.
  • Lithium niobate (LN) is a key material for electro-optic modulators due to its properties.
  • Lithium niobate-on-insulator (LNOI) wafers facilitate compact photonic device development.

Purpose of the Study:

  • To develop a novel electro-optic modulator using LNOI.
  • To demonstrate efficient modulation of reflected light via spectral resonance shifts.
  • To offer a simpler fabrication process and enhanced modulation amplitude.

Main Methods:

  • Fabrication of a Fabry-Pérot resonator using a thin LN film and gold electrodes.
  • Application of an alternating voltage to induce spectral resonance shifts.
  • Measurement of modulation amplitude under applied electric fields.

Main Results:

  • Achieved a 2.3% modulation amplitude with ±10 V alternating voltage.
  • Demonstrated spectral resonance shifts in the Fabry-Pérot resonator.
  • Showcased a simpler fabrication process compared to metasurface modulators.

Conclusions:

  • The developed LNOI electro-optic modulator offers efficient light modulation.
  • The simpler fabrication and larger modulation amplitudes present advantages over existing technologies.
  • This work paves the way for compact electro-optic devices in beam steering, holography, and spatial light modulation.