Abstract-Full vector measurements of converging terahertz beams with linear, circular, and cylindrical vortex polarization

Xinke Wang, Sen Wang, Zhenwei Xie, Wenfeng Sun, Shengfei Feng, Ye Cui, Jiasheng Ye, and Yan Zhang  »View Author Affiliations

Optics Express, Vol. 22, Issue 20, pp. 24622-24634 (2014)
http://dx.doi.org/10.1364/OE.22.024622

http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-22-20-24622

The complete vector information of converging terahertz (THz) beams with linear, circular, and cylindrical vortex polarization are precisely measured by using a THz digital holographic imaging system. The transverse (Ex, Ey) and longitudinal (Ez) polarization components of the THz fields around the focal point are separately obtained utilizing the detection crystals with different crystalline orientations. The measured results are in good agreement with the theoretical expectations. This imaging technique provides an effective way for revealing the vector diffraction properties of the THz electro-magnetic waves.

© 2014 Optical Society of America

Abstract-Focusing and imaging of a virtual all-optical tunable terahertz Fresnel zone plate

Xinke Wang, Zhenwei Xie, Wenfeng Sun, Shengfei Feng, Ye Cui, Jiasheng Ye, and Yan Zhang  »View Author Affiliations
http://www.opticsinfobase.org/ol/abstract.cfm?uri=ol-38-22-4731

A virtual all-optical tunable terahertz Fresnel zone plate is achieved utilizing the localized distribution of the transient electron plasma on a silicon wafer. Its focusing and imaging performance are experimentally demonstrated. Experimental results show that the effect of the virtual zone plate is the same as an actual one. Adjusting the spatial pattern of the electron plasma, the central wavelength and the focal length of the virtual zone plate can be all-optically dynamically steered. The research is a significant step to the development of tunable optical imaging elements.

© 2013 Optical Society of America