English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

The synthesis of ultra-long lived acoustic phonons in a variety of materialsand device geometries could enable a range of new coherent informationprocessing and sensing technologies; many forms of phonon dissipation pose abarrier to this goal. We explore linear and nonlinear contributions to phonondissipation in silica at cryogenic temperatures using fiber-optic structuresthat tightly confine both photons and phonons to the fiber-optic core. Whenimmersed in helium, this fiber system supports nearly perfect guidance of 9 GHzacoustic phonons; strong electrostrictively mediated photon-phonon coupling (orguided-wave stimulated Brillouin scattering) permits a flexible form oflaser-based phonon spectroscopy. Through linear and nonlinear phononspectroscopy, we isolate the effects of disorder-induced two-level tunnelingstates as a source of phononic dissipation in this system. We show that anensemble of such two-level tunneling states can be driven intotransparency--virtually eliminating this source of phonon dissipation over abroad range of frequencies. Experimental studies of phononic self-frequencysaturation show excellent agreement with a theoretical model accounting for thephonon coupling to an ensemble of two-level tunneling states. Extending theseresults, we demonstrate a general approach to suppress dissipation produced bytwo-level tunneling states via cross-saturation, where the lifetime of aphonons at one frequency can be extended by the presence of a high intensityacoustic beam at another frequency. Although these studies were carried out insilica, our findings are quite general, and can be applied to a range ofmaterials systems and device geometries.

Long-lived guided phonons in fiber by manipulating two-level systems