Pair of combined optical fiber optical tweezers based on special optical fibers
A technology of special optical fiber and optical fiber tweezers, which is applied in the coupling of optical waveguide, optics, light guide, etc., can solve the problem of single function, and achieve the effect of flexible and convenient operation, high integration and simple structure
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Embodiment 1
[0047] Embodiment 1: A preparation process of combined optical fiber optical tweezers based on special optical fiber.
[0048] Step 1: Take a section of coaxial dual-waveguide fiber 1 and ring-core fiber 2, remove the coating layer, cut the end face of the fiber flat with a cleaver, and wipe it clean with alcohol.
[0049] Step 2: Put the two sections of optical fiber into the optical fiber fusion splicer for fusion splicing.
[0050] Step 3: Cut the ring-core optical fiber 2 with a fixed-length cutting system, so that the length of the ring-core fiber 2 is 350 μm.
[0051] Step 4: Wipe the welded optical fiber with alcohol to remove dust, and then put the optical fiber on the translation stage of the femtosecond micromachining system;
[0052] Step 5: Set the frequency to 60kHz, the power to 0.5mW, and select the objective lens with 50× and numerical aperture of 0.42, so that the femtosecond laser can be focused on the surface of the fiber end through the microscopic objecti...
Embodiment 2
[0056] Example 2: Capture of single particles.
[0057] Figure 4 It is a schematic diagram of trapping particles after the light transmitted in the ring core is converged by the frustum. Turn on the laser 7, the light in the laser 7 is coupled into the ring core 102 of the coaxial dual waveguide fiber 1 through the coaxial dual waveguide fiber connector 5, and then transmitted to the ring core 202 of the ring core fiber 2, and finally passes through the frustum 3 converge to form a good three-dimensional trapping potential well.
[0058] for Figure 4 For the structure of trapped particles, the force simulation of the small ball is carried out by using the finite element method, in which the background refractive index is 1.33, the small ball’s refractive index is 1.41, the refractive index of the annular cores 102 and 202 is 1.46, and the frustum angle is 17°. The result is as Figure 5 , Figure 6 shown. Figure 5 It is a graph of the lateral optical trapping force on...
Embodiment 3
[0061] Example 3: Capture of dual particles.
[0062] Figure 10 It is a schematic diagram of trapping two particles at the same time, and the focal length of the Fresnel diffraction lens 4 is designed to be 20 μm. Turn on laser 6 and laser 7 at the same time. The light in the laser 6 is coupled to the intermediate core 101 of the coaxial dual waveguide fiber 1 through the coaxial dual waveguide fiber connector 5; then transmitted to the cladding 201 of the ring core fiber 2, and finally converged by the Fresnel diffraction lens 4 A three-dimensional potential well that can stably trap particles is formed. The light in the laser 7 is coupled into the ring core 102 of the coaxial dual waveguide fiber 1 through the coaxial dual waveguide fiber connector 5, then transmitted to the ring core 202 of the ring core fiber 2, and then converged through the frustum 3 to form a stable A three-dimensional potential well for trapping particles. Two particles can be captured simultaneou...
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