Enhanced efficiency of coherent acoustic phonon generation and detection using elliptical micropillars - CNRS - Centre national de la recherche scientifique Accéder directement au contenu
Communication Dans Un Congrès Année : 2024

Enhanced efficiency of coherent acoustic phonon generation and detection using elliptical micropillars

Résumé

Optophononic resonators based on GaAs/AlAs multilayer structures can confine near-infrared photons and subterahertz phonons. Previous works have studied the generation and detection of coherent acoustic phonons in planar and circular micropillar cavities. However, these structures exhibit only one optical cavity mode, which makes it challenging to reach the efficient generation and sensitive detection simultaneously in a standard pump-probe experiment. Here, we propose the use of elliptical micropillars to reach an improved condition of these two processes. The elliptical cross-section of the microcavity lifts the degeneracy of the fundamental optical modes, related to each of its major and minor axes. By tuning the pump pulses in resonance with one optical mode, the generation efficiency is enhanced by maximizing the electromagnetic field inside the cavity. Meanwhile, the probe pulses at the same wavelength and with orthogonal polarization detects phonons at the slope of the other mode, where it is sensitive to reflectivity changes. We experimentally demonstrated that the phonon amplitude is enhanced by introducing the ellipticity compared to the circular micropillar. This improvement is promising for future developments in constructing efficient phonon transducers.
Fichier principal
Vignette du fichier
SPIE_Micropillar_Chushuang.pdf (1.42 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04532319 , version 1 (04-04-2024)

Identifiants

  • HAL Id : hal-04532319 , version 1

Citer

Chushuang Xiang, Anne Rodriguez, Edson Cardozo de Oliveira, Luc Le Gratiet, Isabelle Sagnes, et al.. Enhanced efficiency of coherent acoustic phonon generation and detection using elliptical micropillars. SPIE Photonics Europe 2024, SPIE, Apr 2024, Strasbourg, France. ⟨hal-04532319⟩
49 Consultations
20 Téléchargements

Partager

Gmail Mastodon Facebook X LinkedIn More