期刊
LIGHT-SCIENCE & APPLICATIONS
卷 6, 期 -, 页码 -出版社
CHINESE ACAD SCIENCES, CHANGCHUN INST OPTICS FINE MECHANICS AND PHYSICS
DOI: 10.1038/lsa.2016.237
关键词
Fano resonances; optical signal processing; plasmonics; ultrafast switching
类别
资金
- EPSRC (UK)
- Royal Society
- Wolfson Foundation
- EC FP7 project [304179]
- EPSRC [EP/H000917/2, EP/M028054/1, EP/M013812/1, EP/J015393/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H000917/2, EP/J015393/1, EP/M013812/1] Funding Source: researchfish
We propose and investigate, both experimentally and theoretically, a novel mechanism for switching and modulating plasmonic signals based on a Fano interference process, which arises from the coupling between a narrow-band optical Fabry-Perot cavity and a surface plasmon polariton (SPP) source. The SPP wave emitted from the cavity is actively modulated in the vicinity of the cavity resonances by altering the cavity Q-factor and/or resonant frequencies. We experimentally demonstrate dynamic SPP modulation both by mechanical control of the cavity length and all-optically by harnessing the ultrafast nonlinearity of the Au mirrors that form the cavity. An electro-optical modulation scheme is also proposed and numerically illustrated. Dynamic operation of the switch via mechanical means yields a modulation in the SPP coupling efficiency of similar to 80%, while the all-optical control provides an ultrafast modulation with an efficiency of 30% at a rate of similar to 0.6 THz. The experimental observations are supported by both analytical and numerical calculations of the mechanical, all-optical and electro-optical modulation methods.
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