Generation of acoustic terahertz waves in hybrid InGaN/GaN quantum wells

ORAL

Abstract

We have carried out differential transmission measurements on InGaN/ GaN quantum wells with Au nanoparticles inserted inside V-pits with high filling fraction. We have observed acoustic wave packets generated with multiple THz frequencies as 0.12 THz from GaN buffer layer, 0.22 THz from Au-InGaN multiple quantum wells region, 0.07 THz from sapphire substrate, and 0.17 THz mixed signals from the sample. These THz wave packets are observed as a result of generation of coherent acoustic phonons propagating in hybrid Au-InGaN quantum wells. The study of these acoustic THz wave generation is crucial for the imaging of nanostructures.

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Authors

  • Meg Mahat

    • Department of Physics, University of North Texas, Denton, TX 76203
    • University of North Texas

  • Antonia Llopis

    • Department of Electrical and Computer Engineering, Duke University, Durham, NC 27708

  • Tae Youl Choi

    • Department of Mechanical and Energy Engineering, University of North Texas, Denton, TX 76203

  • Sergio Periera

    • CICECO, Universidade de Aveiro, 3810-193 Aveiro, Portugal

  • Ian Watson

    • SUPA, Institute of Photonics, University of Strathclyde, Glasgow, UK

  • Arup Neogi

    • Department of Physics, University of North Texas, Denton, TX 76203