[20p-221B-1~11] 4.5 Nanocarbon and 2D Materials

▼ [20p-221B-8] Terahertz Emission from Photoconductive Antenna Devices with Well-aligned and Chirality-enriched (6,5) Carbon Nanotube Film as Base Material

〇(P)Filchito Bagsican¹, Iwao Kawayama¹, Kazunori Serita¹, Weilu Gao², Natsumi Komatsu², Hironaru Murakami¹, Frank A. Hegmann³, Junichiro Kono², Masayoshi Tonouchi¹ (1.Osaka Univ., 2.Rice Univ., 3.Univ. of Alberta)

Keywords:carbon nanotubes, terahertz emission, photoconductive antenna

We report on the terahertz emission properties of photoconductive antenna (PCA) switches with well-aligned and chirality-enriched (6,5) CNTs thin films as base materials. We observed that the polarity of the THz waveform changes with the direction of the applied bias across the PCA gap, a clear evidence that the emission is generated mainly by photocurrent driven by bias electric field. At a constant number of photons and external electric field across the dipole gap, the observed THz emission amplitude is proportional to the absorbance of CNT film at that excitation wavelength. This can be easily understood when one considers that the initial carrier concentration is dependent on the number of absorbed excitation photons. The dependence of THz emission on magnitude of applied bias, excitation power and polarization, and sample temperature will be also discussed.