Ultrafast active control of localized surface plasmon resonances in silicon bowtie antennas

Audrey Berrier, Ronald Ulbricht, Mischa Bonn, Jaime Gómez Rivas
2010 Optics Express  
Localized surface plasmon polaritons (LSPPs) provide an efficient means of achieving extreme light concentration. In recent years, their active control has become a major aspiration of plasmonic research. Here, we demonstrate direct control of semiconductor bowtie antennas, enabling active excitation of LSPPs, at terahertz (THz) frequencies. We modify the LSPPs by ultrafast optical modulation of the free carrier density in the plasmonic structure itself, allowing for active control of the
more » ... ontrol of the semiconductor antennas on picosecond timescales. Moreover, this control enables the manipulation of the field intensity enhancements in ranges of four orders of magnitude.
doi:10.1364/oe.18.023226 pmid:21164664 fatcat:twq5f75otza4be4fqwjvffo2mu