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

Authors

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

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

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25-28 June 2025, National Institute of Physics, University of the Philippines Diliman

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Article ID

SPP-2025-PA-25

Section

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

Published

2025-06-17

How to Cite

[1]

KJ Fernandez, H Bardolaza, RJ Chu, D Jung, JMS Arcilla, IC Verona, A Somintac, A Salvador, and E Estacio, Carrier dynamics of indium arsenide quantum dash photoconductive antennas under 1.55 μm photo-excitation , Proceedings of the Samahang Pisika ng Pilipinas 43, SPP-2025-PA-25 (2025). URL: https://proceedings.spp-online.org/article/view/SPP-2025-PA-25.