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Jet Lem

As seen in: Nature, Physical Review B
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Articles by Jet Lem

Dynamic diagnosis of metamaterials through laser-induced vibrational signatures - Nature

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By Yun Kai, Somayajulu Dhulipala, Rachel Sun, Jet Lem, Thomas Pezeril
| Nature Verified
Abstract Mechanical metamaterials at the microscale exhibit exotic static properties owing to their engineered building blocks1,2,3,4, but their dynamic properties have remained substantially less explored. Their design principles can target frequency-dependent properties5,6,7 and resilience under high-strain-rate deformation8,9, making them versatile materials for applications in lightweight impact resistance10,11,12, acoustic waveguiding7,13 or vibration damping14,15.
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Additive laser excitation of giant nonlinear surface acoustic wave pulses

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By Jude Deschamps, Yun Kai, Jet Lem, Ievgeniia Chaban
| Physical Review B
The technique of laser ultrasonics perfectly meets the need for noncontact, noninvasive, nondestructive mechanical probing of nanometer- to millimeter-size samples. However, this technique is limited to the excitation of low-amplitude strains, below the threshold for optical damage of the sample. In the context of strain engineering of materials, alternative optical techniques enabling the excitation of high-amplitude strains in a nondestructive optical regime are needed.
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Converging-diverging shock-driven instabilities along soft hydrogel surfaces

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By Daniel B. Pickard, Dmitro Martynowych, Jet Lem, Anwar Koshakji
| Physical Review B
Abstract Intense surface eruptions are observed along the curved surface of a confined cylindrical film of hydrogel subject to laser-induced converging-diverging shock loading. Detailed numerical simulations are used to identify the dominant mechanisms causing mechanical instability. The mechanisms that produce surface instability are found to be fundamentally different from both acoustic parametric instability and shock-driven Richtmyer-Meshkov instability.
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