title: Interferometric detection of extensional modes of GaN nanorods array.
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.
authors.affiliation: Department of Physics, School of Science, Guangdong University of Petrochemical Technology, Maoming, Guangdong 525000, China.
authors.forename: Pierre-Adrien
authors.initials: PA
authors.lastname: Mante
authors.forename: Cheng-Ying
authors.initials: CY
authors.lastname: Ho
authors.forename: Li-Wei
authors.initials: LW
authors.lastname: Tu
authors.forename: Chi-Kuang
authors.initials: CK
authors.lastname: Sun
mesh_terms: D005708:Gallium / Q000737:chemistry*; D007368:Interferometry / Q000379:methods*; D008422:Materials Testing / Q000379:methods; D043942:Nanotubes / Q000737:chemistry*; D013057:Spectrum Analysis / Q000379:methods*
chemical_list: C473348:gallium nitride; D005708:Gallium