T-ray profile synthesis using photoconductive emitter array

被引：0
|
作者：
Hattori, Toshiaki [1 ]
Masuda, Masayoshi [1 ]
Sakamoto, Masaya [1 ]
Egawa, Kazuhiro [1 ]
Itatani, Taro [2 ]
Ohi, Akihiko [2 ]
机构：
[1] Univ Tsukuba, Inst Appl Phys, 1-1-1 Tennodai, Tsukuba, Ibaraki 3058573, Japan
[2] AIST, Tsukuba, Ibaraki 3058568, Japan
来源：
TERAHERTZ PHYSICS, DEVICES, AND SYSTEMS II | 2007年 / 6772卷
基金：
日本学术振兴会;
关键词：
THz waves; photoconductive antenna; antenna array; synthesis; real-time imaging; super-resolution;
D O I：
10.1117/12.733615
中图分类号：
O59 [应用物理学];
学科分类号：
摘要：
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 run 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.
引用
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页数：8
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