Abstract
In this work the use of guided wave photo-polymerization for the fabrication of novel polymeric micro tips for optical trapping is demonstrated. It is shown that the selective excitation of linear polarized modes, during the fabrication process, has a direct impact on the shape of the resulting micro structures. Tips are fabricated with modes LP02 and LP21 and their shapes and output intensity distribution are compared. The application of the micro structures as optical tweezers is demonstrated with the manipulation of yeast cells.
Highlights
IntroductionSince the invention of the laser, a vast demand on beam shaping has been verified in areas such as micro-fabrication [1], optical sensing, optical trapping [2,3] of biologic samples or even medicine
Since the invention of the laser, a vast demand on beam shaping has been verified in areas such as micro-fabrication [1], optical sensing, optical trapping [2,3] of biologic samples or even medicine.Common beam shaping setups include several optical bulk components, which are mostly large and complex [4,5]
We present a rapid method based on photo-polymerization for fabrication of micro structures at the top of optical fiber (OF) to be used as single fiber optical tweezers
Summary
Since the invention of the laser, a vast demand on beam shaping has been verified in areas such as micro-fabrication [1], optical sensing, optical trapping [2,3] of biologic samples or even medicine. Micro fabrication processes that use FIB milling [16] and femtosecond lasers [19], allow the fabrication of versatile structures, but have the drawback of being expensive and time consuming. In this regard, we present a rapid method based on photo-polymerization for fabrication of micro structures at the top of OFs to be used as single fiber optical tweezers. This paper is organized as follows: in the second section the fabrication process and some aspects of multimode propagation in step index OFs will be described, in the third section the polymer structures are presented, analyzed and validated as optical tweezers, in the conclusions some final remarks will be given about the work presented in this paper
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