Photoconductively Loaded Plasmonic Nanoantenna as Building Block for Ultracompact Optical Switches
Photoconductively Loaded Plasmonic Nanoantenna as Building Block for Ultracompact Optical Switches
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DOI：
10.1021/nl1001636
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发表时间：
2010-05-01
期刊：
影响因子：
10.8
通讯作者：
Muskens, Otto L.
中科院分区：
文献类型：
--
作者：
Large, Nicolas;Abb, Martina;Muskens, Otto L.
提出并从理论上探讨了基于非线性等离子体纳米天线的超快光开关的新概念。天线纳米开关操作在两个紧密间隔的金属纳米棒之间的从电容到导电耦合制度的过渡上。通过用非晶硅填充天线间隙，由于半导体中自由载流子密度的变化，实现了渐进的天线间隙加载。在远场响应和局部近场强度中都观察到天线响应的强烈修改。天线开关的大调制深度、低开关阈值和潜在的超快时间响应为从集成纳米光子电路到量子信息器件的应用提供了希望。
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.