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Sound Waves: Resonance01:14

Sound Waves: Resonance

Resonance is produced depending on the boundary conditions imposed on a wave. Resonance can be produced in a string under tension with symmetrical boundary conditions (i.e., has a node at each end). A node is defined as a fixed point where the string does not move. The symmetrical boundary conditions result in some frequencies resonating and producing standing waves, while other frequencies interfere destructively. Sound waves can resonate in a hollow tube, and the frequencies of the sound...

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Optimized reflector stacks for solidly mounted bulk acoustic wave resonators.

Sumy Jose1, Andre B M Jansman, Raymond J E Hueting

  • 1MESA+ Institute for Nanotechnology, Semiconductor Components, University of Twente, The Netherlands. s.jose@utwente.nl

IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
|December 16, 2010
PubMed
Summary

This study enhances bulk acoustic wave resonators by optimizing acoustic mirrors to reflect both longitudinal and shear waves, significantly boosting resonator quality factor (Q). New optical design approaches improve resonator performance for advanced applications.

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Area of Science:

  • Materials Science
  • Acoustic Engineering
  • Optics

Background:

  • The quality factor (Q) of solidly mounted bulk acoustic wave resonators (SMRs) is typically limited by substrate losses.
  • Traditional acoustic mirrors are optimized solely for longitudinal wave reflection, neglecting shear waves.

Purpose of the Study:

  • To develop novel acoustic mirror designs for SMRs capable of reflecting both longitudinal and shear waves.
  • To enhance the quality factor (Q) of SMRs by minimizing substrate losses through improved acoustic mirror designs.

Main Methods:

  • Two optics-inspired design approaches were investigated: stopband theory and diffraction grating design.
  • Finite element modeling (FEM) was used to simulate and validate the acoustic mirror designs.
  • Experimental fabrication and characterization of shear-optimized SMR devices were performed.

Main Results:

  • The stopband theory approach achieved calculated minimum transmissions of 25 dB for longitudinal and 20 dB for shear waves.
  • The diffraction grating approach maintained near quarter-wave performance for longitudinal waves, with minimum transmission below 26 dB for shear waves.
  • Experimental results demonstrated a 1-D Q factor of approximately 3300 for the realized shear-optimized devices.

Conclusions:

  • The proposed optical design approaches effectively enhance acoustic mirror performance for SMRs.
  • Optimizing acoustic mirrors for both wave types significantly improves resonator quality factor (Q).
  • The developed SMRs show promise for applications requiring high-performance acoustic wave devices.