Optically controlled terahertz beam steering and imaging

Stefan Busch, Benedikt Scherger, Maik Scheller, Martin Koch

Research output: Contribution to journalArticlepeer-review

102 Scopus citations


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 languageEnglish (US)
Pages (from-to)1391-1393
Number of pages3
JournalOptics letters
Issue number8
StatePublished - Apr 15 2012

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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