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Julio Andrés Iglesias Martínez receives the Best Student Award at IEEE Ultrasonic Symposium
His work consists in achieving three-dimensional phononic crystals at the micro-scale with record band-gap width.
The study of periodic artificial structures such as phononic crystals opens up the possibility for engineering effective mechanical and acoustical properties, as well as introducing bandgaps. Ultrasonics offers a wide range of potential applications, such as imaging techniques at frequencies from 1 to 15 MHz, typically. Thanks to additive manufacturing, the fabrication of complex structures such as 3D phononic crystals are now made possible. However, the limited resolution of conventional 3D printers, of the order of a few tens of micrometers, limits their working frequencies well below 1 MHz. That is a reason why three-dimensional phononic crystals operating at frequencies above 1 MHz remain elusive. In this work, we designed, fabricated, and characterized a 3D phononic crystal that has a wide band gap for frequencies extending from 0.6 MHz to 7.5 MHz, which sets a record in the field. The crystal samples are fabricated at the microscale using two-photon lithography, thanks to the facilities of the MIMENTO nanofabrication center of Institute FEMTO-ST.
 J.A. Iglesias Martínez, J. Moughames, G. Ulliac, M. Kadic and V. Laude, Presentation at the IEEE International Ultrasonic Symposium, Best Student Award in the category Physical Acoustics (September 2021).
 J.A. Iglesias Martínez, J. Moughames, G. Ulliac, M. Kadic and V. Laude, “Three-dimensional phononic crystal with ultra-wide bandgap at megahertz frequencies,” Applied Physics Letters 118 (6), 063507 (2021).