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[IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Terahertz Wave Generation Using Single or Few-cycle Laser Pulses in a Gaseous Medium
摘要： We perform theoretical calculations to demonstrate that single or few-cycle laser pulses (at the wavelength of 800 nm) can generate an intense terahertz emission by a directional current. Terahertz (THz) radiation exhibits a strong dependence on the carrier-envelope phase (CEP) of the driving laser pulse as the duration decreases. The strength of the THz radiation is pronounced at the CEP of 90 deg. The design of an experimental setup to demonstrate THz wave generation using single or few-cycle laser pulses in a gaseous medium is also demonstrated.
关键词： directional current,single or few-cycle laser pulses,Terahertz wave generation,carrier-envelope phase (CEP)
更新于2025-09-16 10:30:52
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Photoconductive antennas based on epitaxial films In <sub/>0.5</sub> Ga <sub/>0.5</sub> As on GaAs (1?1?1)A and (1?0?0)A substrates with a metamorphic buffer
摘要： The terahertz (THz) wave generation by the spiral photoconductive antennas fabricated on the low-temperature and high-temperature grown undoped and Si-doped In0.5Ga0.5As films is studied by the terahertz time-domain spectroscopy method. The In0.5Ga0.5As layers were grown by molecular beam epitaxy on GaAs substrates with (1 0 0) and (1 1 1) A crystallographic orientations utilizing step-graded InxGa1?xAs metamorphic buffer. The antennas are excited by radiation of Er3+-fiber laser at 1.56 μm wavelength in two regimes: with pulse durations of 2.5 ps or 100 fs. It is found that the THz wave generation is 3–4 times more effective in the case of InGaAs-based antennas on (1 1 1)A GaAs substrates as compared to the (1 0 0) substrates. Power-voltage characteristic of the LT-InGaAs antenna up to and beyond threshold breakdown voltage are reported.
关键词： time-domain spectroscopy,terahertz wave generation,photoconductive antenna,GaAs (1 1 1)A,InGaAs,molecular beam epitaxy
更新于2025-09-09 09:28:46