Interferometric detection of extensional modes of GaN nanorods array Pierre-Adrien Mante1
Journal
Optics Express
Journal Volume
20
Journal Issue
17
Pages
18717-18722
Date Issued
2012
Author(s)
Abstract
Femtosecond pump probe spectroscopy experiments were carried out to observe extensional modes of GaN nanorods. Different orders of extensional modes were generated and observed following the absorption of femtosecond light pulses. This observation confirms that with a diameter on the order of 100 nm, no mechanical change is expected compared to bulk GaN. We propose and demonstrate that the detection of these modes is achieved through the modulation of the Fabry-Pérot cavity formed by the nanorod array. The extensional modes change the nanorods length and thus modify the reflectivity of the rod-array cavity.
Type
journal article