Journal
OPTICS EXPRESS
Volume 18, Issue 22, Pages 23226-23235Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.18.023226
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- Nederlandse Organisatie voor Wetenschappelijk Onderzoek (NWO) [FP7-224189]
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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 semiconductor antennas on picosecond timescales. Moreover, this control enables the manipulation of the field intensity enhancements in ranges of four orders of magnitude. (C) 2010 Optical Society of America
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