Carrier dynamics of indium arsenide quantum dash photoconductive antennas under 1.55 μm photo-excitation

Authors

  • Kristiene Joy Fernandez Materials Science and Engineering Program, University of the Philippines Diliman
  • Hannah Bardolaza National Institute of Physics, University of the Philippines Diliman
  • Rafael Jumar Chu Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology
  • Daehwan Jung Center for Opto-Electronic Materials and Devices, Korea Institute of Science and Technology
  • Jose Mari Sebastian Arcilla National Institute of Physics, University of the Philippines Diliman
  • Ivan Cedrick Verona National Institute of Physics, University of the Philippines Diliman
  • Armando Somintac National Institute of Physics, University of the Philippines Diliman
  • Arnel Salvador National Institute of Physics, University of the Philippines Diliman
  • Elmer Estacio National Institute of Physics, University of the Philippines Diliman

Abstract

Indium arsenide (InAs) quantum dashes (QDash) grown on semi-insulating indium phosphide (SI-InP) wafers were fabricated into photoconductive antennas (PCAs) to investigate the effect of a varying number of QDash monolayers (ML) on the carrier dynamics. The samples were characterized using terahertz- time-domain spectroscopy (THz-TDS) with 1.55 μm excitation to isolate the THz emission of the QDashes from the bulk. A 90% THz intensity enhancement was observed from the sample with 7 MLs (QDash2) compared to the sample with 5 MLs (QDash1). This was attributed to its increased number of photocarriers and enhanced quantum confinement. Additionally, the QDash2 sample exhibited a wider bandwidth in the THz frequency spectra, presumably due to its short carrier lifetime and high velocity. Power dependence measurements further revealed that QDash2 has better optical-to-THz conversion efficiency and higher saturation power than QDash1 based on its steeper slope and fitted saturation value, respectively.

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Published

2025-06-17

Issue

2025: Proceedings of the 43rd Samahang Pisika ng Pilipinas Physics Conference

Section

Poster Session PA (Photonics, Condensed Matter, Materials and Quantum Science)

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How to Cite

[1]
“Carrier dynamics of indium arsenide quantum dash photoconductive antennas under 1.55 μm photo-excitation ”, Proc. SPP, vol. 43, no. 1, p. SPP-2025-PA-25, Jun. 2025, Accessed: Mar. 31, 2026. [Online]. Available: https://proceedings.spp-online.org/article/view/SPP-2025-PA-25