Journal
NANO LETTERS
Volume 10, Issue 5, Pages 1741-1746Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl1001636
Keywords
Plasmonics; nanoantennas; nanoparticles; ultrafast switches
Categories
Funding
- EPSRC [EP/H019669/1]
- HEFCE, SEPnet
- Basque Government
- Spanish Ministry of Innovation and Science [FIS2007-667 11-C01-01]
- EPSRC [EP/H019669/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/H019669/1] Funding Source: researchfish
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we propose and explore theoretically a new concept of ultrafast optical switches based on nonlinear plasmonic nanoantennas. The antenna nanoswitch operates on the transition from the capacitive to conductive coupling regimes between two closely spaced metal nanorods. By filling the antenna gap with amorphous silicon, progressive antenna-gap loading is achieved due to variations in the free-carrier density in the semiconductor. Strong modification of the antenna response is observed both in the far-field response and in the local near-field intensity. The large modulation depth, low switching threshold, and potentially ultrafast time response of antenna switches holds promise for applications ranging from integrated nanophotonic circuits to quantum information devices.
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