Ultrafast opto-acoustics applied to the study of material nanostructures

Grimsley, T J; Yang, Fan; Che, Shan; Antonelli, G. A.; Maris, Humphrey J.; Nurmikko, A. V.

doi:10.1088/1742-6596/278/1/012037

Cited by 4 publications

(6 citation statements)

References 11 publications

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“…As discussed previously, 8,9 the optimization of the design for the cavity has to take into account several factors: 1) As far as the choice of materials is concerned, it is advantageous to choose all materials in the cavity structure with nearly the same acoustic impedance. This is to minimize reflection of sound at the interfaces.…”

Section: A) Scanning Microscope Designmentioning

confidence: 99%

A scanning acoustic microscope based on picosecond ultrasonics

et al. 2015

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We report on the development of a new type of scanning acoustic microscope. We use a femtosecond light pulse to generate a short sound pulse, and then focus this sound onto the sample by means of a specially designed and microfabricated acoustic lens of radius a few microns. The sound travels to the sample through a thin layer of water. The sound reflected from the sample is collected by the lens and then passes through a monolithically integrated optical resonant cavity. The induced change in the properties of this cavity are measured using a time-delayed probe light pulse. We describe some of the challenges involved in the construction and operation of this high-precision metrology apparatus and present some preliminary results.

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Section: A) Scanning Microscope Designmentioning

confidence: 99%

A scanning acoustic microscope based on picosecond ultrasonics

et al. 2015

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“…where the dressed states can be obtained by taking the eigenvector and eigenvalues of equation (13). In the absence of phonon coupling where W = 0, we obtain the familiar dressed state result of a CPT system [42] where the eigenvalues are  ( ) G 0, 2 and the eigenvectors are…”

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confidence: 99%

“…1 and ñ -ñ | | 3 1 transitions. This is possible with the advent of coherent phonon sources in defect-based systems [25][26][27], material systems [34][35][36][37] and nanofabricated systems [11,[13][14][15][16][17][18][19]. Last, our model only considered a single emitter to illustrate the physics of the system but a model that considers an ensemble of such emitters is necessary for feasible experimental realization [42].…”

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confidence: 99%

“…Development in active manipulation of electromagnetic waves through light-matter interaction have led to creation of nanoscale optical emitters 5 and gates 6 and similar progress have been made in controlling phonons using their interaction with matter especially in the realms of optomechanics 7 and phononic devices 8,9 . Phonons span a vast frequency range and while techniques to control and sense lower frequency coherent phonons have been well-developed [10][11][12][13][14][15][16][17][18][19] , heat carrying coherent terahertz acoustic phonons have been harder to measure directly due to the small wavelength and numerous scattering mechanism at these small wavelengths 20 . In the past, THz crystal phonons have been generated and detected in low temperature experiments with defect doped crystals [21][22][23][24] , with experimental evidence of coherent phonon generation [25][26][27] .…”

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confidence: 99%

“…Lastly, due to phase fluctuation, the coherent phonon field must carry the same phase fluctuation as the optical field, so we must generate the phonons in a coherent manner with the same laser field for the |2 − |1 and |3 − |1 transitions. This is possible with the advent of coherent phonon sources in defect-based systems [25][26][27] , material systems [34][35][36][37] and nanofabricated systems 11,[13][14][15][16][17][18][19] .…”

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See 2 more Smart Citations

Sensing coherent phonons with two-photon interference

Ding¹,

Yin²,

Li³

2018

New J. Phys.

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Detecting coherent phonons pose different challenges compared to coherent photons due to the much stronger interaction between phonons and matter. This is especially true for high frequency heat carrying phonons, which are intrinsic lattice vibrations experiencing many decoherence events with the environment, and are thus generally assumed to be incoherent. Two photon interference techniques, especially coherent population trapping (CPT) and electromagnetically induced transparency (EIT), have led to extremely sensitive detection, spectroscopy and metrology. Here, we propose the use of two photon interference in a three-level system to sense coherent phonons. Unlike prior works which have treated phonon coupling as damping, we account for coherent phonon coupling using a full quantum-mechanical treatment. We observe strong asymmetry in absorption spectrum in CPT and negative dispersion in EIT susceptibility in the presence of coherent phonon coupling which cannot be accounted for if only pure phonon damping is considered. Our proposal has application in sensing heat carrying coherent phonons effects and understanding coherent bosonic multi-pathway interference effects in three coupled oscillator systems.

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Understanding photon sideband statistics and correlation for determining phonon coherence

Ding

Yin

2018

Phys. Rev. B

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Ultrafast opto-acoustics applied to the study of material nanostructures

Cited by 4 publications

References 11 publications

A scanning acoustic microscope based on picosecond ultrasonics

A scanning acoustic microscope based on picosecond ultrasonics

Sensing coherent phonons with two-photon interference

Understanding photon sideband statistics and correlation for determining phonon coherence

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