5.Institute of Materials Research and Engineering, A*STAR, 3 Research Link, Singapore 117602, Singapore
6.Nanophotonics Research Centre, Shenzhen University & Key Laboratory of Optoelectronic Devices and Systems of Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China
7.School of Electrical and Electronic Engineering, Nanyang Technological University, Singapore 639798, Singapore
8.School of Engineering, RMIT University, Melbourne, VIC 3001, Australia
enables rapid evaluation of fundamental mathematical operations
such as derivatives and integrals. Conventionally
a converging lens performs an optical FT in free space when light passes through it. The speed of the transformation is limited by the thickness and the focal length of the lens. By using the wave nature of surface plasmon polaritons (SPPs)
here we demonstrate that the FT can be implemented in a planar configuration with a minimal propagation distance of around 10 μm
resulting in an increase of speed by four to five orders of magnitude. The photonic FT was tested by synthesizing intricate SPP waves with their Fourier components. The reduced dimensionality in the minuscule device allows the future development of an ultrafast on-chip photonic information processing platform for large-scale optical computing.
关键词
Keywords
diffractionFourier opticsoptical computingoptical information processingsurface plasmon polaritons
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