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Related Concept Videos

Standing Waves in a Cavity01:28

Standing Waves in a Cavity

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A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
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Related Experiment Video

Updated: Sep 21, 2025

Fabrication of Surface Acoustic Wave Devices on Lithium Niobate
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Exploring Low-Loss Surface Acoustic Wave Devices on Heterogeneous Substrates.

Jinbo Wu, Shibin Zhang, Liping Zhang

    IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
    |June 2, 2022
    PubMed
    Summary

    This study introduces shear horizontal surface acoustic wave (SH-SAW) devices on lithium tantalate-on-sapphire (LTOS) substrates, demonstrating superior temperature stability and low loss for radio frequency (RF) applications. These devices maintain performance up to 150 °C, outperforming lithium tantalate-on-insulator (LTOI) alternatives.

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    Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations

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    Area of Science:

    • Materials Science
    • Electrical Engineering
    • Acoustics

    Background:

    • Surface Acoustic Wave (SAW) devices are crucial for radio frequency (RF) filtering and sensing.
    • Temperature stability and low insertion loss are critical performance metrics for SAW devices in wireless communications.
    • Lithium tantalate (LiTaO3) is a common piezoelectric material, but its performance can be substrate-dependent.

    Purpose of the Study:

    • To develop and characterize shear horizontal surface acoustic wave (SH-SAW) devices utilizing ultrathin Y42-cut lithium tantalate on sapphire (LTOS) substrates.
    • To evaluate the temperature stability and insertion loss of SH-SAW devices on LTOS compared to LiTaO3-on-insulator (LTOI) substrates.
    • To demonstrate the potential of LTOS-based SH-SAW devices for demanding RF applications.

    Main Methods:

    • Fabrication of SH-SAW resonators and filters on Y42-cut LiTaO3 film grown on sapphire substrates.
    • Electrical and acoustic characterization of devices, including resonance frequency, electromechanical coupling, quality factor (Bode-Q), fractional bandwidth (FBW), and insertion loss (IL).
    • Comparative analysis of device performance (CPW and SH-SAW) on LTOS and LTOI substrates across a temperature range of 25 °C to 150 °C.

    Main Results:

    • Demonstrated SH-SAW resonators with scalable resonances (1.76–3.17 GHz), effective electromechanical coupling (5.1%–7.6%), and high quality factors (419–3019).
    • Developed a 3.26 GHz filter with suppressed spurious passband, 3% FBW, and low IL of 2.39 dB.
    • LTOS devices exhibited significantly better temperature stability, with maintained IL and impedance ratio up to 150 °C, unlike deteriorating LTOI devices.

    Conclusions:

    • Ultrathin Y42-cut LiTaO3 on sapphire (LTOS) enables high-performance SH-SAW devices with excellent temperature stability and low loss.
    • The high resistivity of sapphire and stable LiTaO3/sapphire interface are key to the superior RF performance of LTOS substrates at elevated temperatures.
    • LTOS-based SAW devices show great promise for temperature-sensitive, low-loss RF wireless communication applications.