Open AccessInterferometric detection of extensional modes of GaN nanorods array
Author(s) -
PierreAdrien Mante,
Cheng-Ying Ho,
LiWei Tu,
ChiKuang Sun
Publication year - 2012
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.018717
Subject(s) - nanorod , materials science , femtosecond , optics , interferometry , optoelectronics , extensional definition , birefringence , spectroscopy , laser , nanotechnology , physics , paleontology , quantum mechanics , biology , tectonics
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.