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Fiber-based angular filtering for high-resolution Brillouin spectroscopy in the 20-300 GHz frequency range.

A Rodriguez, P Priya, O Ortiz

    Optics Express
    |March 17, 2021
    PubMed
    Summary
    This summary is machine-generated.

    We developed a new Brillouin spectroscopy method for nanoscale imaging. This technique enhances phonon detection in semiconductor superlattices, offering high spectral resolution for optomechanics and stimulated Brillouin scattering studies.

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    Area of Science:

    • Optics and Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Brillouin spectroscopy is a valuable non-invasive technique for nanoscale imaging and sensing.
    • Semiconductor superlattices are crucial for enhancing phonon generation/detection at GHz frequencies.
    • Existing Brillouin spectrometers are complex and limited in wavelength tunability for semiconductor cavities.

    Purpose of the Study:

    • To develop a pragmatic Brillouin spectroscopy approach for semiconductor cavities.
    • To enable tunable excitation sources for broadband optical and acoustic frequency studies.
    • To enhance nanoscale imaging and sensing capabilities in optomechanical systems.

    Main Methods:

    • Implemented a fibered-based angular filtering system.
    • Utilized a rotating single etalon and double grating spectrometer for spectral filtering.
    • Developed a sequential reconstruction method for Brillouin spectra.
    • Integrated a widely tunable excitation source.

    Main Results:

    • Achieved probing of confined acoustic phonon modes in the 20-300 GHz range.
    • Demonstrated excellent laser rejection and high spectral resolution.
    • Observed improved angular filtering with decreasing phonon frequency via optical cavity excitation/collection.
    • Validated the scheme for broadband cavity optomechanics and stimulated Brillouin scattering.

    Conclusions:

    • The developed Brillouin spectroscopy method is suitable for semiconductor cavities and broadband studies.
    • This approach offers high spectral resolution and excellent laser rejection.
    • It advances nanoscale imaging and sensing for cavity optomechanics and stimulated Brillouin scattering.