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Creators/Authors contains: "Bo, Fang"

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  1. ; ; ; ; ; ( , Optics Letters)

    We report a method to generate angularly polarized vector beams with a topological charge of one by rotating air holes to form two-dimensional photonic crystal (PC) cavities. The mode volume and resonance wavelength of these cavities are tuned from0.33(λ<#comment/>/n)3to12(λ<#comment/>/n)3and in a wide range of 400 nm, respectively, by controlling the range of fixed air holes near the center of the structure. As a benefit, the half-maximum divergence angles of the vector beam can be widely changed from 90° to∼<#comment/>60∘<#comment/>. By adjusting the shift direction of the air holes in the PC cavities, optical vector beams with different far-field morphology are obtained. The scheme provides not only an alternative method to generate optical vector beams, but also an effective strategy to control far-field morphology and polarizations, which holds promising applications such as optical microscopy and micro-manipulation.

     
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  2. ; ; ; ; ; ; ; ( , Optics Letters)