Fiber optic trapping of low-refractive-index particles

Khyati Samarendra Mohanty; Carlo Liberale; Samarendra Kumar Mohanty; Vittorio Degiorgio; Stefano Cabrini; Alessandro Carpentiero; Valeria Garbin; Mauro Prasciolu; Dan Cojoc; Enzo Di Fabrizio

doi:10.1117/12.647254

22 February 2006 Fiber optic trapping of low-refractive-index particles

Khyati Samarendra Mohanty, Carlo Liberale, Samarendra Kumar Mohanty, Vittorio Degiorgio, Stefano Cabrini, Alessandro Carpentiero, Valeria Garbin, Mauro Prasciolu, Dan Cojoc, Enzo Di Fabrizio

Author Affiliations +

Proceedings Volume 6088, Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues IV; 608812 (2006) https://doi.org/10.1117/12.647254
Event: SPIE BiOS, 2006, San Jose, California, United States

Abstract

Since the low index particles are repelled away from the highest intensity point, trapping them optically requires either a rotating Gaussian beam or optical vortex beams focused by a high numerical microscope objective. However, the short working distance of these microscope objectives puts a limit on the depth at which these particles can be manipulated. Here, we show that axicon like structure built on tip of a single mode optical fiber produces a focused beam that is able to trap low index particles. In fact, in addition to transverse trapping inside the dark conical region surrounded by high intensity ring, axial trapping is possible by the balance of scattering force against the buoyancy of the particles. The low-index particle system consisted of an emulsion of water droplets in acetophenone. When the fiber was kept horizontal, the low index spheres moved away along the beam and thus could be transported by influence of the scattering force. However in the vertical position (or at an angle) of the fiber, the particles could be trapped stably both in transverse and axial directions. Chain of such particles could also be trapped and transported together by translation of the fiber. Using escape force technique, transverse trapping force and thus efficiency for particle in Mie regime was measured. Details of these measurements and theory showed that trapping of Raleigh particle is possible with such axicon-tip fibers. This ability to manipulate low-index spheres inside complex condensed environments using such traps will throw new insights in the understanding of bubble-bubble and bubble-wall interactions, thus probing the physics behind sonoluminescence and exploring new applications in biology and medicine.

Citation Download Citation

Khyati Samarendra Mohanty, Carlo Liberale, Samarendra Kumar Mohanty, Vittorio Degiorgio, Stefano Cabrini, Alessandro Carpentiero, Valeria Garbin, Mauro Prasciolu, Dan Cojoc, and Enzo Di Fabrizio "Fiber optic trapping of low-refractive-index particles", Proc. SPIE 6088, Imaging, Manipulation, and Analysis of Biomolecules, Cells, and Tissues IV, 608812 (22 February 2006); https://doi.org/10.1117/12.647254

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available