Mufei Xiao
An optical tweezer capable of picking up dielectric as well as metallic objects of sizes much smaller than the light wavelength is proposed based on point-like two-dimensionally slotted waveguides. Slot waveguides transport light based on evanescent modes, therefore, with sub-wavelength resolution. A point-like slot waveguide confines light within a sub-wavelength cross-section, and a strong gradient electric field is formed. A radiation force is induced by the strong gradient field, and the force is strong enough for optically trapping and manipulating small objects of different sizes and refractive indice with sub-wavelength resolution. As an example, the proposed device is numerically simulated with a rectangular slot waveguide so as to confirm its feasibility. Since the assumed device profile and materials are common for chip formation, the proposed device has the potential to become a lab-on-a-chip opto-electric tool for biologic analysis.
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