Open AccessControlling the Quality Factor of a Single Acoustic Nanoresonator by Tuning its Morphology
Author(s) -
Fabio Medeghini,
Aurélien Crut,
Marco Gandolfi,
Francesco Rossella,
Paolo Maioli,
Fabrice Vallée,
Francesco Banfi,
Natalia Del Fatti
Publication year - 2018
Publication title -
nano letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 4.853
H-Index - 488
eISSN - 1530-6992
pISSN - 1530-6984
DOI - 10.1021/acs.nanolett.8b02096
Subject(s) - substrate (aquarium) , materials science , sapphire , aspect ratio (aeronautics) , morphology (biology) , vibration , spectroscopy , molecular vibration , resonator , q factor , optics , optoelectronics , molecular physics , chemistry , acoustics , physics , raman spectroscopy , laser , oceanography , quantum mechanics , biology , genetics , geology
The mechanical vibrations of individual gold nanodisks nanopatterned on a sapphire substrate are investigated using ultrafast time-resolved optical spectroscopy. The number and characteristics of the detected acoustic modes are found to vary with nanodisk geometry. In particular, their quality factors strongly depend on nanodisk aspect ratio (i.e., diameter over height ratio), reaching a maximal value of ≈70, higher than those previously measured for substrate-supported nano-objects. The peculiarities of the detected acoustic vibrations are confirmed by finite-element simulations, and interpreted as the result of substrate-induced hybridization between the vibrational modes of a nanodisk. The present findings demonstrate novel possibilities for engineering the vibrational modes of nano-objects.
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