Improved terahertz generation from a photoconductive antenna with metal line arrays

Authors

Neil Irvin Cabello ⋅ PH National Institute of Physics, University of the Philippines Diliman
Hannah R. Bardolaza ⋅ PH National Institute of Physics, University of the Philippines Diliman
Ivan Cedrick Verona ⋅ PH National Institute of Physics, University of the Philippines Diliman
John Paul Ferrolino ⋅ PH Materials Science and Engineering Program, College of Science, University of the Philippines Diliman
Miguel Bacaoco ⋅ 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
Alexander De Los Reyes ⋅ PH National Institute of Physics, University of the Philippines Diliman
Elmer Estacio ⋅ PH National Institute of Physics, University of the Philippines Diliman

Abstract

Spiral-pattern photoconductive antennas (PCA) on semi-insulating GaAs substrate were fabricated via UV photolithography and electron beam deposition of Ni/Au layers. Micron-scale Ni/Au metal line arrays were fabricated on the terahertz (THz) emission side of a PCA. The THz emission intensity of the PCA with metal line arrays was measured using THz time-domain spectroscopy, and was compared with that of a reference spiral-pattern PCA having a bare emission side. An enhancement of 6 times in the THz peak-to-peak amplitude (and 42 times in the integrated FFT power) was observed at a fluence of ~1.2 mJ/cm² and 20 V_PP bias voltage. The dependence of the THz signal amplitudes with varying optical pump fluences and emitter bias voltages were investigated to characterize the fabricated PCA's and infer the THz emission mechanism of enhanced THz generation from a PCA integrated with subwavelength metal line arrays.

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Issue

2021: Proceedings of the 39th Samahang Pisika ng Pilipinas Physics Conference

Article ID

SPP-2021-1B-04

Section

Condensed Matter Physics and Materials Science

Published

2021-10-14

How to Cite

[1]

NI Cabello, HR Bardolaza, IC Verona, JP Ferrolino, M Bacaoco, A Somintac, A Salvador, A De Los Reyes, and E Estacio, Improved terahertz generation from a photoconductive antenna with metal line arrays, Proceedings of the Samahang Pisika ng Pilipinas 39, SPP-2021-1B-04 (2021). URL: https://proceedings.spp-online.org/article/view/SPP-2021-1B-04.