Comprehensive theoretical study of optical, thermophysical and acoustic properties of surface nanostructures with metallic nanoparticles for fiber-optic photoacoustic ultrasound transducers

Current state of the research on optoacoustic fiber-optic ultrasonic transducers based on thermoelastic effect and fiber-optic interferometric receivers

“…The optoacoustic response is experimentally observed in the frequency range of 10 -18 MHz for surface nanostructure with average size of nanoparticles of 35 nm, RMS size variation of 12 nm and surface occupation density of 3.8 % [170]. This is in a good agreement with theoretical results.…”

“…The following experimental procedure illustrates example of optoacoustic response measurement [170]. Silver NPs monolayer has been deposited on the optical fiber edge using pulsed laser deposition method [169].…”

Thermophysical and mechanical properties of active membranes for photoacoustic generators of forced acoustic oscillations

“…Very promising ultrasound sources for the purpose of acoustic imaging are photoacoustic generators [7][8][9]. Fiber optic ultrasound transmitters possess a number of benefits: wide band of working frequencies, dielectric implementation, low weight and size [2,10].…”

“…For an absorptive structure exposed to intensitymodulated laser beam, when the characteristic time of absorption comes out to be considerably lower than the modulation period, a change in its size causes a forced acoustic oscillation with a frequency defined by the laser beam modulation frequency [9,10]. It is suggested to implement imaging with the use of photoacoustic generators based on forced oscillations, where bandwidth of the generated signal is completely defined by the laser beam modulation [8,10,11].…”

“…The dependence of heat release volume power is dived into N steps (typically N > 2 8 ), and at each time step the heat release problem is solved for the whole structure. In this case after each of N three-dimensional temperature distributions is calculated, the problem of structural analysis is solved to obtain three-dimensional distribution of stress, pressure in the structure, i. e. a model of structure is formed for the next time step.…”