All-optical switching based on controlled energy transfer between nanoparticles in film arrays
All-optical switching based on controlled energy transfer between nanoparticles in film arrays
复制标题
基于薄膜阵列中纳米粒子之间受控能量转移的全光开关
DOI：
10.1117/1.3079796
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发表时间：
2009
影响因子：
1.5
通讯作者：
D. Andrews
中科院分区：
文献类型：
--
作者：
D. S. Bradshaw;D. Andrews
对具有适当电子能级的粒子之间的电子激发能迁移施加光控制的可能性，为所有光开关提供了基础。在薄膜中排列纳米颗粒的配置中实现，该工艺可以提供超快的并行处理能力。其机制是能量从一层的供体纳米粒子（通过吸收光写入电子激发态）到对应受体的近场转移；该转移效应可被非共振激光辐射激活。在没有激光的情况下，基于对称或能量学的理由，严格禁止供体-受体能量转移，光学控制的可能性就出现了。在这种条件下，光开关可以由单个关闭谐振光束的吞吐量产生，或者通过更多的控制选项，由两个重合光束产生。在模型电动力学计算中，传递保真度（表示将输入映射到指定输出的精度）可以根据关键的光学和几何特性进行识别和计算。结果表明，在合理的激光强度水平下，串扰下降到微不足道的水平。潜在的应用超出了简单的开关到逻辑门和光缓冲器的全光元件。
The potentiality to exert optical control, over the migration of electronic excitation energy between particles with suitably disposed electronic levels, affords a basis for all optical switching. Implemented in a configuration with nanoparticles arrayed in thin films, the process can offer an ultrafast parallel-processing capability. The mechanism is a near-field transfer of energy from donor nanoparticles in one layer (written into an electronically excited state by the absorption of light) to counterpart acceptors; the transfer effect proves amenable to activation by non-resonant laser radiation. The possibility of optical control arises under conditions where the donor-acceptor energy transfer is rigorously forbidden in the absence of laser light, either on the grounds of symmetry or energetics. Under such conditions, optical switching can be produced by the throughput of a single off resonant beam or, with more control options, by two coincident beams. In model electrodynamical calculations the transfer fidelity, signifying the accuracy of mapping an input to its designated output, can be identified and cast in terms of key optical and geometric characteristics. The results show that, at reasonable levels of laser intensity, cross talk drops to insignificant levels. Potential applications extend beyond simple switching into all-optical elements for logic gates and optical buffers.