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1. (WO2019043733) MAGNETICALLY AUGMENTED PLASMONIC TWEEZERS
ملاحظة: نص مبني على عمليات التَعرف الضوئي على الحروف. الرجاء إستخدام صيغ PDF لقيمتها القانونية

I/We claim:

1. A Magnetically Augmented Plasmonic Tweezer (MAPT) comprising:

a helical support structure to provide maneuverability in fluid;

a magnetic component integrated in the helical support structure for motion control; and

plasmonic nanostructures integrated in the helical support structure for optical trapping of particles.

2. The MAPT as claimed in claim 1, wherein the plasmonic nanostructures are distributed across a surface of the helical support structure.

3. The MAPT as claimed in claim 1, wherein the plasmonic nanostructures are provided towards one end of the helical support structure.

4. The MAPT as claimed in claim 1, wherein the magnetic component is provided towards one end of the helical support structure.

5. The MAPT as claimed in claim 1, wherein the plasmonic nanostructures are adapted to trap and release colloidal particles of size in sub -micrometer range.

6. The MAPT as claimed in claim 1, wherein the plasmonic nanostructures trap the particles by one or more of thermophoretic force, near-field plasmonic force, and convective force.

7. The MAPT as claimed in claim 1, wherein the plasmonic nanostructures are formed of one or more of Ag, Au, Cu, Al, TiN, and Aluminium-doped Zinc Oxide

(AZO).

8. The MAPT as claimed in claim 1, wherein the magnetic component comprises one or more of iron, cobalt, and nickel.

9. The MAPT as claimed in claim 1, wherein the helical support structure is made of a dielectric material.

10. A method for fabricating a Magnetically Augmented Plasmonic Tweezer (MAPT), the method comprising:

depositing a seed layer on a substrate;

depositing a magnetic component on the seed layer;

growing a film of silica over the magnetic component by rotating the substrate, resulting in formation of a helical support structure integrated with the magnetic component;

integrating plasmonic nanostructures with the helical support structure by one of: deposition of a plasmonic material with the magnetic component and deposition of the plasmonic material on the helical support structure; and

sonicating the substrate in a fluid to obtain a suspension of the MAPTs in the fluid.

11. The method as claimed in claim 10, wherein integrating the plasmonic nanostructures by deposition of the plasmonic material on the helical support structure comprises:

depositing a thin film of the plasmonic material on the helical support structure; and

annealing the thin film to form the plasmonic nanostructures.

12. The method as claimed in claim 10, wherein the deposition of the magnetic component is by Glancing Angle Deposition (GLAD) technique.

13. The method as claimed in claim 10, wherein integrating the plasmonic nanostructures by deposition of the plasmonic material with the magnetic component comprises depositing alternate layers of the magnetic component and the plasmonic material on the seed layer.

14. The method as claimed in claim 13, wherein a thickness of a layer of the magnetic component is greater than and in the similar order of magnitude of a thickness of a layer of the plasmonic material.

15. The method as claimed in claim 13, wherein three layers of the plasmonic material are deposited with two layers of the magnetic component in between.

16. The method as claimed in claim 10, wherein the plasmonic nanostructures are formed by one or more of Ag, Au, Al, Cu, TiN, and Aluminium-doped Zinc Oxide (AZO).

17. The method as claimed in claim 10, wherein the seed layer on the substrate is a monolayer of colloidal beads.

18. A method for trapping and maneuvering one or more colloidal particles inside a fluid, the method comprising:

driving, by a rotating magnetic field, one or more of magnetically augmented plasmonic tweezers (MAPTs) towards the one or more colloidal particles, wherein the one or more MAPTs comprise a helical support structure, a magnetic component integrated in the helical support structure for motion control, and plasmonic nanostructures integrated in the helical support structure for optical trapping of particles;

providing illumination by an optical source to activate the plasmonic nanostructures and trap the one or more colloidal particles;

driving, by the rotating magnetic field, the MAPT with the trapped one or more colloidal particles to transport the one or more colloidal particles from a first location to a second location; and

reducing the illumination of the optical source below a threshold value to release the one or more colloidal particles from the MAPT at the second location.

19. The method as claimed in claim 18, wherein the rotating magnetic field is provided by a triaxial Helmholtz coil to maneuver the one or more MAPTs.

20. The method as claimed in claim 18, further comprising, selectively trapping the one or more colloidal particles based on size, by tuning one of the illumination intensity of the optical source and rotation frequency of the rotating magnetic field driving the helical support structure.

21. The method as claimed in claim 18, further comprising tuning the illumination of the optical source to permanently trap chemically functionalized particles.

22. The method as claimed in claim 21, wherein the chemically functionalized particles are selected from coated fluorescent nanodiamonds and quantum dots.

23. The method as claimed in claim 18, wherein the fluid is a biological fluid.

24. The method as claimed in claim 23, wherein the biological fluid is selected from blood, mucus, cellular fluid, fluid in an organ, and fluid in a tissue.

25. The method as claimed in claim 18, wherein the fluid is inside a lab-on-chip device.