All Outputs (39)

Photoelastic properties of zinc-blende (AlGa)N in the UV: picosecond ultrasonic studies (2018)
Journal Article

Picosecond ultrasonics was used to study the photoelastic properties of zinc-blende (cubic) c-Al?Ga???N with x around 0.5 The velocities for longitudinal sound in the alloys were measured using ultrafast UV pump-probe experiments with (Al... Read More about Photoelastic properties of zinc-blende (AlGa)N in the UV: picosecond ultrasonic studies.

Generation of a localised microwave magnetic field by coherent phonons in a ferromagnetic grating (2018)
Journal Article

A high-amplitude microwave magnetic field localized at the nanoscale is a desirable tool for various applications within the rapidly developing field of nanomagnetism. Here, we drive magnetization precession by coherent phonons in a metal ferromagnet... Read More about Generation of a localised microwave magnetic field by coherent phonons in a ferromagnetic grating.

Phonon spectroscopy with chirped shear and compressive acoustic pulses (2017)
Journal Article

Picosecond duration compressive and shear phonon wave packets injected into (311) GaAs slabs transform after propagation through ?1??mm into chirped acoustic pulses with a frequency increasing in time due to phonon dispersion. By probing the temporal... Read More about Phonon spectroscopy with chirped shear and compressive acoustic pulses.

Acousto-optical nanoscopy of buried photonic nanostructures (2017)
Journal Article

We develop a nanoscopy method with in-depth resolution for layered photonic devices. Photonics often requires tailored light field distributions for the optical modes used, and an exact knowledge of the geometry of a device is crucial to assess its p... Read More about Acousto-optical nanoscopy of buried photonic nanostructures.

The effect of dynamical compressive and shear strain on magnetic anisotropy in a low symmetry ferromagnetic film (2017)
Journal Article

Dynamical strain generated upon excitation of a metallic film by a femtosecond laser pulse may become a versatile tool enabling control of magnetic state of thin _lms and nanostructures via inverse magnetostriction on a picosecond time scale. Here we... Read More about The effect of dynamical compressive and shear strain on magnetic anisotropy in a low symmetry ferromagnetic film.

Picosecond Control of Quantum Dot Laser Emission by Coherent Phonons (2017)
Journal Article

© 2017 American Physical Society. American Physical Society. A picosecond acoustic pulse can be used to control the lasing emission from semiconductor nanostructures by shifting their electronic transitions. When the active medium, here an ensemble o... Read More about Picosecond Control of Quantum Dot Laser Emission by Coherent Phonons.

Piezoelectric response to coherent longitudinal and transverse acoustic phonons in a semiconductor Schottky diode (2017)
Journal Article

We study the generation of microwave electronic signals by pumping a (311) GaAs Schottky diode with compressive and shear acoustic phonons, generated by femtosecond optical excitation of an Al _lm transducer and mode conversion at the Al-GaAs interfa... Read More about Piezoelectric response to coherent longitudinal and transverse acoustic phonons in a semiconductor Schottky diode.

Picosecond acoustics in single quantum wells of cubic GaN/(Al,Ga)N (2017)
Journal Article

A picosecond acoustic pulse is used to study the photoelastic interaction in single zinc-blende GaN/AlxGa1−xN quantum wells. We use an optical time-resolved pump-probe setup and demonstrate that tuning the photon energy to the quantum well’s lowest e... Read More about Picosecond acoustics in single quantum wells of cubic GaN/(Al,Ga)N.

Heterodyne mixing of millimetre electromagnetic waves and sub-THz sound in a semiconductor device (2016)
Journal Article

We demonstrate heterodyne mixing of a 94 GHz millimetre wave photonic signal, supplied by a Gunn diode oscillator, with coherent acoustic waves of frequency ~ 100 GHz, generated by pulsed laser excitation of a semiconductor surface. The mixing takes... Read More about Heterodyne mixing of millimetre electromagnetic waves and sub-THz sound in a semiconductor device.

Contributions from coherent and incoherent lattice excitations to ultrafast optical control of magnetic anisotropy of metallic films (2016)
Journal Article

Spin-lattice coupling is one of the most prominent interactions mediating response of spin ensemble to ultrafast optical excitation. Here we exploit optically generated coherent and incoherent phonons to drive coherent spin dynamics, i.e. precession,... Read More about Contributions from coherent and incoherent lattice excitations to ultrafast optical control of magnetic anisotropy of metallic films.

Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films (2016)
Journal Article

Ultrafast optical excitation of a metal ferromagnetic film results in a modification of the magnetocrystalline anisotropy and induces the magnetization precession. We consider two main contributions to these processes: an effect of noncoherent phonon... Read More about Ultrafast changes of magnetic anisotropy driven by laser-generated coherent and noncoherent phonons in metallic films.

Nanomechanical probing of the layer/substrate interface of an exfoliated InSe sheet on sapphire (2016)
Journal Article

Van der Waals (vdW) layered crystals and heterostructures have attracted substantial interest for potential applications in a wide range of emerging technologies. An important, but often overlooked, consideration in the development of implementable d... Read More about Nanomechanical probing of the layer/substrate interface of an exfoliated InSe sheet on sapphire.

Coherent acoustic phonons in colloidal semiconductor nanocrystal superlattices (2016)
Journal Article

Resonant driving of magnetization precession in a ferromagnetic layer by coherent monochromatic phonons (2015)
Journal Article

We realize resonant driving of the magnetization precession by monochromatic phonons in a thin ferromagnetic layer embedded into a phononic Fabry-Pérot resonator. A femtosecond laser pulse excites resonant phonon modes of the structure in the 10−40 G... Read More about Resonant driving of magnetization precession in a ferromagnetic layer by coherent monochromatic phonons.

Coherent phonon optics in a chip with an electrically controlled active device (2015)
Journal Article

Phonon optics concerns operations with high-frequency acoustic waves in solid media in a similar way to how traditional optics operates with the light beams (i.e. photons). Phonon optics experiments with coherent terahertz and sub-terahertz phonons p... Read More about Coherent phonon optics in a chip with an electrically controlled active device.

Lasing from active optomechanical resonators (2014)
Journal Article

Planar microcavities with distributed Bragg reflectors (DBRs) host, besides confined optical modes, also mechanical resonances due to stop bands in the phonon dispersion relation of the DBRs. These resonances have frequencies in the 10- to 100-GHz ra... Read More about Lasing from active optomechanical resonators.

High-frequency acousto-optic effects in Bragg reflectors (2014)
Journal Article

Picosecond acoustic interferometry was used to study the acousto-optic properties of a distributed Bragg reflector (DBR) manufactured from two immiscible polymers (cellulose acetate and polyvinylcarbyzole). Picosecond strain pulses were injected into... Read More about High-frequency acousto-optic effects in Bragg reflectors.

Dynamics of a vertical cavity quantum cascade phonon laser structure (2013)
Journal Article

Driven primarily by scientific curiosity, but also by the potential applications of intense sources of coherent sound, researchers have targeted the phonon laser (saser) since the invention of the optical laser over 50 years ago. Here we fabricate a... Read More about Dynamics of a vertical cavity quantum cascade phonon laser structure.

Terahertz sound lasers (sasers): recent developments and applications
Journal Article