Wavelength dependent terahertz wave modulation based on preformed air plasma

Tong Wu; Liangliang Zhang; Shijing Zhang; Hang Zhao; Liquan Dong; Cunlin Zhang; Yuejin Zhao

doi:10.1117/12.2319819

14 September 2018 Wavelength dependent terahertz wave modulation based on preformed air plasma

Tong Wu, Liangliang Zhang, Shijing Zhang, Hang Zhao, Liquan Dong, Cunlin Zhang, Yuejin Zhao

Proceedings Volume 10756, Terahertz Emitters, Receivers, and Applications IX; 107560Q (2018) https://doi.org/10.1117/12.2319819
Event: SPIE Optical Engineering + Applications, 2018, San Diego, California, United States

Abstract

Terahertz wave generation from laser induced air plasma is widely used due to its high electric field and broad frequency bandwidth. For further understanding of the mechanism of the terahertz wave generation in laser-induced plasma as well as the terahertz modulator base on pre-formed air plasma, the generation of terahertz radiation using an effective wavelength scaling mechanism is examined when two-color laser fields are mixed in pre-formed plasma created by synchronized 800nm laser pulse. In our experiment, the effect of preformed plasma is investigated using an orthogonal pumping geometry. With a preformed plasma, both the modulation depth of terahertz radiation energy and the change of terahertz radiation polarization increases with increasing excitation laser wavelength. We found that the terahertz modulation depth and terahertz polarization changes increase as a function of the energy of the 800nm-prepulse. Some possible reasons are discussed. We attribute the terahertz polarization rotation to additional relative phase of the two-color fields introduced by the preformed air plasma. This provides a practical way to control the polarization and energy of terahertz pulses for potential applications.

Conference Presentation

Citation Download Citation

Tong Wu, Liangliang Zhang, Shijing Zhang, Hang Zhao, Liquan Dong, Cunlin Zhang, and Yuejin Zhao "Wavelength dependent terahertz wave modulation based on preformed air plasma", Proc. SPIE 10756, Terahertz Emitters, Receivers, and Applications IX, 107560Q (14 September 2018); https://doi.org/10.1117/12.2319819

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available