Threshold for terahertz resonance of nanoparticles in water

dc.contributor.authorXiang, Dao
dc.contributor.authorWu, Jian
dc.contributor.authorRottler, Jörg
dc.contributor.authorGordon, Reuven
dc.date.accessioned2023-04-27T21:54:42Z
dc.date.available2023-04-27T21:54:42Z
dc.date.copyright2016en_US
dc.date.issued2016-05-20
dc.description.abstractNanoparticle vibrations are coupled to light through electrostriction, which gives nonlinear optical scattering. We investigated the acoustic response of 2 nm gold nanoparticles using a nearly degenerate four-wave mixing experimental configuration and show that the nonlinear response suddenly turns on at low powers (<100 mW) for continuous-wave (CW) lasers. The observed nonlinear response is a million times larger than typical electronic nonlinearities. The threshold implies a dramatic change in the quality factor of the vibrating nanoparticles, 4 orders of magnitude larger than usual hydrodynamic theory predicts. It is as if the water is removed altogether, which we speculate is the result of the vibrating particle pushing away the water molecules to form a stable cavity. Because these acoustic vibrations extend to terahertz frequencies, there is potential to harness this effect for high speed optical data processing, as well as to probe the dynamics of proteins all having acoustic modes in this range.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipThe authors acknowledge funding from the Materials for Enhanced Energy Technologies NSERC CREATE program and the NSERC Discovery Grant program.en_US
dc.identifier.citationXiang, D., Wu, J., Rottler, J., & Gordon, R. (2016). Threshold for terahertz resonance of nanoparticles in water. Nano Letters, 16(6), 3638–3641. https://doi.org/10.1021/acs.nanolett.6b00770en_US
dc.identifier.urihttps://doi.org/10.1021/acs.nanolett.6b00770
dc.identifier.urihttp://hdl.handle.net/1828/15016
dc.language.isoenen_US
dc.publisherNano Lettersen_US
dc.subjectFour-wave mixingen_US
dc.subjectelectrostrictionen_US
dc.subjectterahertzen_US
dc.subjectacousticsen_US
dc.subjectcavitationen_US
dc.subjectnanoparticlesen_US
dc.titleThreshold for terahertz resonance of nanoparticles in wateren_US
dc.typePostprinten_US

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