Abstract
We propose a spatial modulator for terahertz waves based on light induced electron plasma in photo-active semiconductors. A two-dimensional array of computer controlled light is used to create free carries in bulk silicon, which results in a spatial modulation of the transmission at terahertz frequencies. This method not only exhibits a remarkable modulation depth over a broad frequency range but also allows for an optically controlled beam steering of terahertz waves by inducing virtual grating structures. In addition, we analyze the possibility of all-optically controlled terahertz imaging.
Original language | English (US) |
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Pages (from-to) | 1391-1393 |
Number of pages | 3 |
Journal | Optics letters |
Volume | 37 |
Issue number | 8 |
DOIs | |
State | Published - Apr 15 2012 |
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics