Selective manipulation of particles for multifunctional optical fiber tweezers with wavelength division multiplexing technology

We propose and demonstrate a multifunctional tapered optical fiber tweezers (MTOFT) for capturing and manipulating micro particles. By employing the wavelength division multiplexing technology, two wavelengths, 980 nm and 650 nm, are coupled into optical fiber tweezers to achieve the flexibility of capture, transport and release of particles with different refractive indexes using fabricated tapered optical fiber probe (TOFP). Wherein, the 980 nm light wave excites LP₀₁ and LP₁₁ modes beams, and the 650 nm light wave excites LP₀₁, LP₁₁, LP₂₁ and LP₀₂ modes beams. Simulations and experiments demonstrated that the capture of yeast and the ejection of silica are achieved with the laser beam at 980nm wavelength. At 650 nm laser beam, the capture of silica and the ejection of yeast are achieved. This structure enables flexible manipulation of different particles by combining multiple wavelengths, expanding the direction of combining particle transport and particle emission functions.