Electric field imaging using intense half-cycle terahertz pulses

被引：13

作者：

Rungsawang, R ^{[1
]}

Tukamoto, K ^{[1
]}

Hattori, T ^{[1
]}

机构：

[1] Univ Tsukuba, Inst Phys Appl, Tsukuba, Ibaraki 3058573, Japan

来源：

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS BRIEF COMMUNICATIONS & REVIEW PAPERS | 2005年 / 44卷 / 4A期

关键词：

terahertz imaging; half-cycle electric pulse; photoconductive antenna; phase-sensitive detection; frequency-resolved image;

D O I：

10.1143/JJAP.44.1771

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Characteristics of terahertz (THz) imaging using approximately half-cycle THz pulses were studied using a large-aperture biased photoconductive antenna which emits an intense THz field with a large THz beam. Studies of the dependence of the THz image quality on delay time show that real-time imaging is possible if the probe pulse is timed appropriately. The best images were observed at a time window when the THz field had a steep transient. This allows two-dimensional imaging in a fixed-time mode, which enables observation of a nonstationary object. Using phase-sensitive electrooptic detection and scanning a delay time, not only two-dimensional time-domain spectroscopy is possible, but frequency-resolved images are also available. Depending on the frequency, we found that images of the actual shape or the edge of an object were obtained.

引用

页码：1771 / 1776

页数：6

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