Investigation of terahertz emission characteristics of coherent InAs/InGaAs quantum-dash and quantum-dash-in-a-well

Authors

Jose Mari Sebastian C. Arcilla ⋅ 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
Horace Andrew F. Husay ⋅ PH National Institute of Physics, University of the Philippines Diliman
Kristiene Joy B. Fernandez ⋅ PH National Institute of Physics, University of the Philippines Diliman
Lourdes Nicole F. Dela Rosa ⋅ PH National Institute of Physics, University of the Philippines Diliman
Ivan Cedrick M. Verona ⋅ PH National Institute of Physics, University of the Philippines Diliman
Hannah R. Bardolaza ⋅ PH National Institute of Physics, University of the Philippines Diliman
Arnel A. Salvador ⋅ PH National Institute of Physics, University of the Philippines Diliman
Armando S. Somintac ⋅ PH National Institute of Physics, University of the Philippines Diliman
Elmer S. Estacio ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

The terahertz (THz) generation of molecular beam epitaxy (MBE) grown quantum dash (Qdash) and quantum dash-in-a-well (DWELL) were assessed through THz-Time-Domain Spectroscopy (TDS) measurements in reflection geometry. Samples were optically pumped using a 1550nm wavelength femtosecond laser, and detected using an optically gated photoconductive antenna (PCA). The measured peak-to-peak difference THz signal values for samples Qdash-1, Qdash-2, and DWELL were 11 pA, 13 pA, and 6 pA, respectively. Fast Fourier Transform (FFT) power spectra revealed that the center of frequency of the samples were 0.72 THz for Qdash-1, 0.72 THz for Qdash-2, and 0.65 THz for DWELL. Moreover, The differences in observed signals between Qdashes and DWELL were demonstrated, and was attributed to variations in carrier lifetime from different samples. Additionally, differing degree carrier confinement in Qdashes and DWELL were discussed in relation to THz generation capability.

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Published

2024-06-28

Issue

2024: Proceedings of the 42nd Samahang Pisika ng Pilipinas Physics Conference

Section

Poster Session F (High Energy Physics, Optics, and Physics Education)

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How to Cite

[1]

“Investigation of terahertz emission characteristics of coherent InAs/InGaAs quantum-dash and quantum-dash-in-a-well”, Proc. SPP, vol. 42, no. 1, p. SPP-2024-PF-18, Jun. 2024, Accessed: Apr. 12, 2026. [Online]. Available: https://proceedings.spp-online.org/article/view/SPP-2024-PF-18