A near-field surface plasmon complex amplitude modulation method based on metasurfaces
A technology of surface plasmon and modulation method, applied in the field of micro-nano optics, can solve the problems of inability to easily and flexibly realize the regulation of surface plasmon, complex optical field distribution and propagation, etc., to achieve complex optical field distribution and The effect of spreading, reducing complexity
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[0044] In order to verify the feasibility of the method, taking the in-plane Airy beam as an example, the specific design of the metasurface nano-rectangular hole array is carried out. Airy beam is a kind of non-diffraction beam with self-restoring curved path, which has important application value in surface plasmon circuit and nanoparticle manipulation. At the initial position of the surface plasmon excitation, the complex amplitude expression of the Airy beam is:
[0045]
[0046] where x 0 is the width at half maximum of the main lobe, and a is the apodization term of the exponential function. The absolute value of the Airy function wave packet along the x direction exhibits a series of peaks, while the phase value is alternately segmented 0 and π. take x 0 = 0.8, a = 0.05, sample level range x = -15 μm to x = 2 μm.
[0047] Such as figure 1 As shown, a metasurface-based near-field surface plasmon complex amplitude modulation method disclosed in this embodiment inc...
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