Dielectric nanoparticles trapping using nanostructured optical fiber tip

Ding, M., Hellesø, O.G., Tinguely, J-C. and Brambilla, G. (2014) Dielectric nanoparticles trapping using nanostructured optical fiber tip. Institute for Photonics & Advance Sensing (IPAS) Biophotonics Workshop, Adelaide, Australia.

Abstract

We consider the possibility of creating an optical trap in which the cell or a part of it has a strong influence on the local electric field and thereby has an active role in the trapping mechanism. This so-called self-induced back-action (SIBA) optical trapping is enhanced by the use of an optical resonance. No resonance is required from the trapped object; the resonance is sustained by the trap itself, which in this case was represented by an optical microfiber tip with a cylindrical hole. A 3D model of nanostructured microfiber tip was carried out using 3D Finite Element Method (FEM) to numerically solve Maxwell equations in the frequency domain. Simulations show that a strong field is established around the spherical object, which can be stably trapped inside the hole. The optical microfiber tips were fabricated according to the simulations. The fabrication process can be divided into four main steps: (i) manufacture of optical microfiber tips, (ii) tip flat cut at proper diameter, (iii) gold layer deposition, and (iv) hole opening at the coated microfiber tip apex.

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Contributors

Author: G. Brambilla

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