Group 3 Physical Acoustics PGP – General Physical Acoustics • phoxonics (simultaneous photonic and phononic Phenomena and theory of physical acoustics. crystals and structures) • Novel experimental methods and theory • Brillouin light scattering • New computational methods and visualizations • Interaction of photons and phonons • Picosecond acoustics and laser ultrasound PAT – Acoustic Tweezers and Particle Manipulation • Generation of sound by light (electrostriction, photo- Understanding and exploiting acoustic radiation force on acoustics) objects. • Optical interferometry for ultrasound metrology • Forces on particles, fluids and suspensions • Interactions of ultrasound with electromagnetic waves • Analytical and numerical force calculations • Experimental field and force measurements PMI – Modelling and Inversion • Acoustic streaming Numerical methods to simulate propagation of acoustic and • Devices exploiting the acoustic radiation force, elastic waves in heterogeneous media and structures, or to including: resonant devices, surface acoustic wave perform imaging and inversion on measured wave fields. devices, and acoustic beam and array tweezers • Model tailoring • Particle manipulation (sorting, trapping, patterning, • Coupled acoustic effects filtering, manufacturing and tissue engineering) • Parameter extraction • Acoustic levitation and manipulation in air • Compact modelling • Acousto-fluidics / acoustic microfluidics for lab-on-a- • Model validation chip applications • Imaging • Inverse problems PNL – Nonlinear Acoustics Nonlinear effects related to acoustic waves (bulk or guided) PPN – Phononics in the ultrasonics frequency regime, as well as applications Harnessing elastic and acoustic waves by engineering the of such effects or countermeasures to reduce them. structure of propagation media. • Nonlinear generation effects like harmonic or sub- • Phononic crystals, sonic crystals, and generally wave harmonic generation, intermodulations, etc. propagation in periodic media and structures • Nonlinear effects in oscillators / resonators, non- • Acoustic metamaterials, elastic metasolids, and destructive evaluation, acousto-fluidics, biological metasurfaces tissue, etc. • Micro- and nanoresonators • Acoustic imaging of nonlinear effects (e.g. nonlinear • Bulk, surface, and guided waves in the above media or bubble dynamics) structures • Nonlinear reflection / transmission, contact • Topological phononic insulators, non-reciprocal nonlinearities devices, acoustic diodes • Nonlinear material properties with relation to • Applications of phononics to waveguides, filters, ultrasound, and their physical origin (classical or non- resonators, imaging, acoustic or vibration insulation, classical nonlinearities) energy harvesting, and other functions • Nonlinear coupling of ultrasound to other degrees of • Theory and numerical methods for phononics freedom • Nonlinear waves (shock waves, solitons, etc.) PTF – Thin Films • Experimental techniques and theoretical methods for • Deposition techniques for piezoelectric, dielectric, and investigating and modelling nonlinear effects metallic films • Measurement of extrinsic (thickness, roughness, strain) PTE – High Power and Temperature effects and intrinsic properties (material parameters) Acoustic effects in materials and devices at high excitation • Novel materials in thin film form levels and/or at different temperatures or temperature • Fabricating acoustic devices in thin film form profiles, and the interaction of thermal and acoustic effects. • Analysis of heat dissipation PUM – Ultrasonic Motors & Actuators • Thermo-elastic interaction • Novel ultrasonic motors and actuation mechanisms • Effects of high excitation levels • Performance test and measurement • Design for high power operation • Analysis of mechanism • Thermal modelling and measurements • Modelling for simulation • Temperature dependence of material parameters • Characterization • Applications POA – Opto-Acoustics • Design methodology Physical studies regarding the interaction of sound with electromagnetic waves (e.g. light). PNR – Non-Reciprocal Acoustics • Acousto-optics (diffraction of light by sound) • … • Optomechanics .