TY - JOUR
T1 - Coherent Acoustic Phonons in Plasmonic Nanoparticles
T2 - Elastic Properties and Dissipation at Low Temperatures
AU - Boggiano, Hilario D.
AU - Possmayer, Thomas
AU - Morguet, Luis
AU - Nan, Lin
AU - Sortino, Luca
AU - Maier, Stefan A.
AU - Cortés, Emiliano
AU - Grinblat, Gustavo
AU - Bragas, Andrea V.
AU - de S. Menezes, Leonardo
N1 - Publisher Copyright:
© 2024 American Chemical Society.
PY - 2024/11/7
Y1 - 2024/11/7
N2 - We studied the frequency and quality factor of mechanical plasmonic nanoresonators as a function of temperature, ranging from ambient to 4 K. Our investigation focused on individual gold nanorods and nanodisks of various sizes. We observed that oscillation frequencies increase linearly as temperature decreases until saturation is reached at cryogenic temperatures. This behavior is explained by the temperature dependence of the elastic modulus, with a Debye temperature compatible with reported bulk values for gold. To describe the behavior of the quality factor, we developed a model considering the nanostructures as anelastic solids, identifying a dissipation peak around 150 K due to a thermally activated process, likely of the Niblett-Wilks mechanism type. Importantly, our findings suggest that external dissipation factors are more critical to improving quality factors than internal friction, which can be increased by modifying the nanoresonator’s environment. Our results enable the future design of structures with high vibration frequencies and quality factors by effectively controlling external losses.
AB - We studied the frequency and quality factor of mechanical plasmonic nanoresonators as a function of temperature, ranging from ambient to 4 K. Our investigation focused on individual gold nanorods and nanodisks of various sizes. We observed that oscillation frequencies increase linearly as temperature decreases until saturation is reached at cryogenic temperatures. This behavior is explained by the temperature dependence of the elastic modulus, with a Debye temperature compatible with reported bulk values for gold. To describe the behavior of the quality factor, we developed a model considering the nanostructures as anelastic solids, identifying a dissipation peak around 150 K due to a thermally activated process, likely of the Niblett-Wilks mechanism type. Importantly, our findings suggest that external dissipation factors are more critical to improving quality factors than internal friction, which can be increased by modifying the nanoresonator’s environment. Our results enable the future design of structures with high vibration frequencies and quality factors by effectively controlling external losses.
KW - coherent acoustic phonons
KW - dissipation mechanisms
KW - elastic modulus
KW - low temperature
KW - plasmonic nanoantennas
UR - http://www.scopus.com/inward/record.url?scp=85209590415&partnerID=8YFLogxK
U2 - 10.1021/acsnano.4c09193
DO - 10.1021/acsnano.4c09193
M3 - Article
AN - SCOPUS:85209590415
SN - 1936-0851
VL - 18
SP - 31903
EP - 31911
JO - ACS Nano
JF - ACS Nano
IS - 46
ER -