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Slot-mode-coupled optomechanical crystals.

Marcelo Davanço1, Jasper Chan, Amir H Safavi-Naeini

  • 1Center for Nanoscale Science and Technology, National Institute of Standards and Technology, Gaithersburg, MD 20899-6203, USA. mdavanco@nist.gov

Optics Express
|November 29, 2012
PubMed
Summary
This summary is machine-generated.

We developed a novel cavity optomechanical system using separate nanobeams for flexible design. This system achieves strong coupling for advanced applications like optical frequency conversion.

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Area of Science:

  • Optomechanics
  • Nanophotonics
  • Cavity Optomechanical Systems

Background:

  • Cavity optomechanical systems couple mechanical and optical modes.
  • Achieving strong coupling is crucial for quantum technologies and signal processing.
  • Existing designs often face limitations in independent optimization of optical and mechanical components.

Purpose of the Study:

  • To present a flexible design methodology for cavity optomechanical systems.
  • To achieve strong optomechanical coupling using evanescently coupled nanobeam resonators.
  • To explore applications such as wide-band optical frequency conversion.

Main Methods:

  • Evanescent coupling of a GHz mechanical mode of a nanobeam resonator to an optical mode of a separate nanobeam cavity.
  • Utilizing a small gap (≈ 25 nm) to induce a slot mode effect.
  • Designing and analyzing systems in Silicon Nitride (Si3N4) and Silicon (Si).

Main Results:

  • Demonstrated a design methodology for cavity optomechanics with independent optical and mechanical optimization.
  • Achieved large zero-point optomechanical coupling strengths (g/2π > 300 kHz in Si3N4, g/2π ≈ 900 kHz in Si).
  • Showcased potential for wide-band optical frequency conversion between 1300 nm and 980 nm.

Conclusions:

  • The proposed separate nanobeam design offers significant flexibility and strong coupling.
  • Silicon Nitride's broad optical transparency makes it suitable for visible and near-infrared applications.
  • This platform enables advanced optomechanical functionalities, including efficient optical frequency conversion.