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Improving optical-to-THz conversion efficiency using a binary phase mask

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Abstract

We demonstrate efficient generation of quasi-single-cycle THz pulses using an interdigitated GaAs Large Area Photoconductive Antenna LAPCA with a binary phase mask. The binary phase mask results in a time-delayed excitation of the GaAs antenna, which allows subsequent antennas to produce an additive field. The resulting of this additive field is the generation of a quasi single cycle Thz pulse. We demonstrate control over the temporal profile of the THz waveform to maximize optical-to-THz conversion efficiency, and investigate temporal shaping of the THz field using different phase masks.

© 2011 Optical Society of America

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