THz beam steering using femtosecond laser interference technique

Author

Uematsu, Koji ; Maki, Ken-ichiro ; Otani, Chiko

Author_Institution

Dept. of Phys., Tohoku Univ., Sendai, Japan

fYear

2011

fDate

2-7 Oct. 2011

Firstpage

1

Lastpage

2

Abstract

We present a THz beam steering method that is based on the generation of grating lobe(GL) radiation from linear array antenna and interference principle of femtosecond laser beam. THz GL radiation with the bandwidth of 110GHz was generated from a strip-line photoconductive antenna. As the pump beam two femtosecond laser beams were combined with finite angle and produced an interference pattern. We demonstrated that the THz GL radiation can be steered by adjusting the relative incidence angle between two pump beams. The direction of the THz beam was changed by 20 degrees when the incidence angle of one pump beam was only varied by 0.1 degrees.

Keywords

beam steering; high-speed optical techniques; laser beams; light interference; linear antenna arrays; optical pumping; strip lines; THz beam steering; THz grating lobe radiation generation; bandwidth 110 GHz; femtosecond laser beam; femtosecond laser interference; finite angle; interference pattern; linear array antenna; pump beam; relative incidence angle; strip-line photoconductive antenna; Imaging; Interference; Laser beams; Laser excitation; Measurement by laser beam; Pump lasers; Surface emitting lasers;

fLanguage

English

Publisher

ieee

Conference_Titel

Infrared, Millimeter and Terahertz Waves (IRMMW-THz), 2011 36th International Conference on

Conference_Location

Houston, TX

ISSN

2162-2027

Print_ISBN

978-1-4577-0510-6

Electronic_ISBN

2162-2027

Type

conf

DOI

10.1109/irmmw-THz.2011.6105014

Filename

6105014