Abstract
Ultra-thin metallic nano-strips (thinner than skin depth) can lead to anomalous reflection for a transverse magnetic (TM) incidence of some wave-lengths, due to the phase modulation of localized surface plasmon resonance. Based on the principle above, we proposed a method of polarization modulation using ultra-thin metallic nano-strips. When irradiating nano-strips vertically by light with a given polarized angle, we can utilize the phase difference of the TM transmission and transverse electric (TE) transmission near anomalous reflection region to modulate transmission polarization. We have designed and fabricated the ultra-thin metallic nano-strips with the function of quarter-wave plate, the attained transmission Stokes parameter S3 is 0.95. The nano-strips is easy to design and fabricate, also compatible with other optics devices, hence has the potential applications in integrated optics field.
Highlights
Traditional polarization modulation devices are mainly made of birefringent crystal with accurate thickness, such as quartz etc, which can generate additional optical path difference between the two incident electric field components which parallel to the optical axis and perpendicular to the optical axis
Meta-materials/meta-surfaces has the excellent ability of optical control and some achievements have been gained by utilizing Meta-material/meta-surfaces to make polarization conversion devices.[1,2,3,4,5,6,7,8,9]
We proposed a theoretical model to investigate the anomalous reflection of ultra-thin metallic nano-strips, the simulation shows a reasonable agreements with the corresponding experimental results,[19] and the phase modulation was analyzed.[10]
Summary
To obtain the optimum structure parameters of ultra-thin metallic nano-strips based quarterwave plate for a feature wavelength needed, we have to calculate and analyze the relationship of the phase difference of transmissions and the transmission coefficients to nano-strips period and incident wavelengths. Three dash lines correspond to the nano-strips periods and incident wavelengths where |φy − φx | = π/2 Those results reveal that the energy transmissivity is quite different at the periods where the ultra-thin metallic nano-strips could realize the function of quarter-wave plate: the minimum is close to zero (λ = 1013nm, Λ = 490nm, θ0 = 0.60◦,T =3.263×10-5), and the maximum is 0.61 (λ = 610nm, Λ = 400nm, θ0 = 44.98◦).
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