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Updated: Jul 13, 2026
Fabrication of 1-D Photonic Crystal Cavity on a Nanofiber Using Femtosecond Laser-induced Ablation
Published on: February 25, 2017
Selective optical generation of coherent acoustic nanocavity modes
M F Pascual Winter1, G Rozas, A Fainstein
1Centro Atómico Bariloche and Instituto Balseiro, C.N.E.A., 8400 S. C. de Bariloche, R.N., Argentina and Institut des Nanosciences de Paris, CNRS, Universités Paris 6 et 7, Campus Boucicaut, 140 Rue de Lourmel, 75015 Paris, France.
Abstract:
Femtosecond pump-probe experiments on a Ga0.85In0.15As nanocavity enclosed by two Ga(0.85)In(0.15)As/AlAs phonon Bragg mirrors reveal selective generation of terahertz confined acoustic modes and regular folded phonons. Selective generation of the confined modes alone is achievable for laser excitation at certain energies below the mirror absorption edges, corresponding to electronic transitions within the cavity layer only. Calculations based on the photoelastic effect explain the experimental results. Decay times of cavity and regular modes evidence longer decay times and anharmonic effects for the cavity mode.
