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Ultrabroadband terahertz field detection by proton-bombarded InP photoconductive antennas

Tze-An Liu, Masahiko Tani, Makoto Nakajima, Masanori Hangyo, Kiyomi Sakai, Shin-ichi Nakashima, and Ci-Ling Pan

Open Access Open Access

Abstract

Photoconductive (PC) antennas fabricated on InP bombarded with 180 keV protons of different dosages (InP:H+) all exhibit a useful bandwidth of about 30 THz, comparable to that of the LT-GaAs PC antenna. The peak signal current of the best InP: H+ device (dosage of 1015 ions/cm2) is slightly higher than that of the LT-GaAs one, while the signal-to-noise ratio (SNR) of the former is about half of that of the latter due to lower resistivity. This suggests that InP: H+ can be a good substrate for THz PC antennas with proper annealing and/or implantation recipe.

©2004 Optical Society of America

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Figures (4)
Fig. 1.
Fig. 1. Current-voltage (I–V) measurement (a) without and (b) with optical illumination for InP: H+, doses of 1015 (square dot), 3×1015 (circle dot), 1016 (triangular dot), 3×1016 (diamond dot) ions/cm2 and LT-GaAs (open circle) PC antennas with 5 µm gap in the weak bias case.

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Fig. 2.
Fig. 2. Time-resolved ultrabroadband THz radiation waveforms detected by a PC antenna fabricated on InP: H+ at doses of (a) 1015, (b) 3×1015, (c) 1016, (d) 3×1016 ions/cm2 and (e) LT-GaAs.

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Fig. 3.
Fig. 3. Fourier transformed amplitude spectra of the PC-detected THz pulses shown in Fig. 2. Some spectra are enlarged for easier viewing.

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Fig. 4.
Fig. 4. Noise level of different InP: H+ samples and relative to that of a LT-GaAs PC antenna are plotted as a function of conductance. Circle dot is the data point, dashed line is the fitting curve.

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Tables (1)

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Table 1. Comparison of characteristics PC antenna detectors.

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