T-ray profile synthesis using photoconductive emitter array

Toshiaki Hattori; Masayoshi Masuda; Masaya Sakamoto; Kazuhiro Egawa; Taro Itatani; Akihiko Ohi

doi:10.1117/12.733615

26 September 2007 T-ray profile synthesis using photoconductive emitter array

Toshiaki Hattori, Masayoshi Masuda, Masaya Sakamoto, Kazuhiro Egawa, Taro Itatani, Akihiko Ohi

Proceedings Volume 6772, Terahertz Physics, Devices, and Systems II; 67720J (2007) https://doi.org/10.1117/12.733615
Event: Optics East, 2007, Boston, MA, United States

Abstract

We have observed coherent synthesis of spatial profiles of THz radiation emitted from a photoconductive antenna array. The antenna array is composed of seven independently addressable photoconductive antenna units having interdigitated electrodes. The antennas were pumped by amplified 800 nm femtosecond optical pulses. Emitted THz radiation was focused, and the time-resolved spatial profile of the THz radiation on the focal plane was observed using a newly developed real-time imaging apparatus, which can correct the terahertz field images for nonuniformity in birefringence of the EO crystal. By scanning the delay time, frequency-resolved images were also obtained, which exhibit frequency-dependent field profiles. Field profiles observed were coherent superpositions of terahertz waves emitted from the antenna units constituting the array. By inverting the bias voltage to the central unit of the emitter array, we observed super-resolution beam size of terahertz waves, which are smaller than the diffraction limit.

Citation Download Citation

Toshiaki Hattori, Masayoshi Masuda, Masaya Sakamoto, Kazuhiro Egawa, Taro Itatani, and Akihiko Ohi "T-ray profile synthesis using photoconductive emitter array", Proc. SPIE 6772, Terahertz Physics, Devices, and Systems II, 67720J (26 September 2007); https://doi.org/10.1117/12.733615

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