Journal
OPTICS EXPRESS
Volume 22, Issue 22, Pages 26559-26571Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.22.026559
Keywords
-
Categories
Funding
- ERC [259727 THZ-PLASMON]
- Netherlands Foundation for Fundamental Research on Matter (FOM)
- Netherlands Organization for Scientific Research (NWO)
Ask authors/readers for more resources
We demonstrate active beam steering of terahertz radiation using a photo-excited thin layer of gallium arsenide. A constant gradient of phase discontinuity along the interface is introduced by an spatially inhomogeneous density of free charge carriers that are photo-generated in the GaAs with an optical pump. The optical pump has been spatially modulated to form the shape of a planar blazed grating. The phase gradient leads to an asymmetry between the +1 and -1 transmission diffracted orders of more than a factor two. Optimization of the grating structure can lead to an asymmetry of more than one order of magnitude. Similar to metasurfaces made of plasmonic antennas, the photo-generated grating is a planar structure that can achieve large beam steering efficiency. Moreover, the photo-generation of such structures provides a platform for active THz beam steering. (C) 2014 Optical Society of America
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available